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HDFS-14854. Create improved decommission monitor implementation. Contributed by Stephen O'Donnell. 

Reviewed-by: Inigo Goiri <inigoiri@apache.org>
Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>
This commit is contained in:
Stephen O'Donnell 2019-12-10 17:15:30 -08:00 committed by Wei-Chiu Chuang
parent 875a3e97dd
commit c93cb6790e
12 changed files with 1826 additions and 442 deletions
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15
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
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@ -808,6 +808,21 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
public static final int DFS_NAMENODE_DECOMMISSION_BLOCKS_PER_INTERVAL_DEFAULT = 500000;
public static final String DFS_NAMENODE_DECOMMISSION_MAX_CONCURRENT_TRACKED_NODES = "dfs.namenode.decommission.max.concurrent.tracked.nodes";
public static final int DFS_NAMENODE_DECOMMISSION_MAX_CONCURRENT_TRACKED_NODES_DEFAULT = 100;
public static final String DFS_NAMENODE_DECOMMISSION_MONITOR_CLASS
= "dfs.namenode.decommission.monitor.class";
public static final String
DFS_NAMENODE_DECOMMISSION_MONITOR_CLASS_DEFAULT =
"org.apache.hadoop.hdfs.server.blockmanagement."+
"DatanodeAdminDefaultMonitor";
public static final String
DFS_NAMENODE_DECOMMISSION_BACKOFF_MONITOR_PENDING_LIMIT
= "dfs.namenode.decommission.backoff.monitor.pending.limit";
public static final int
DFS_NAMENODE_DECOMMISSION_BACKOFF_MONITOR_PENDING_LIMIT_DEFAULT = 10000;
public static final String DFS_NAMENODE_DECOMMISSION_BACKOFF_MONITOR_PENDING_BLOCKS_PER_LOCK =
"dfs.namenode.decommission.backoff.monitor.pending.blocks.per.lock";
public static final int DFS_NAMENODE_DECOMMISSION_BACKOFF_MONITOR_PENDING_BLOCKS_PER_LOCK_DEFAULT
= 1000;
public static final String DFS_NAMENODE_HANDLER_COUNT_KEY = "dfs.namenode.handler.count";
public static final int DFS_NAMENODE_HANDLER_COUNT_DEFAULT = 10;
public static final String DFS_NAMENODE_LIFELINE_HANDLER_RATIO_KEY =

818
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminBackoffMonitor.java Normal file
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@ -0,0 +1,818 @@
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hdfs.server.blockmanagement;
import com.google.common.collect.Iterables;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.server.namenode.INode;
import org.apache.hadoop.hdfs.server.namenode.INodeFile;
import org.apache.hadoop.hdfs.server.namenode.INodeId;
import org.apache.hadoop.hdfs.util.LightWeightHashSet;
import org.apache.hadoop.hdfs.util.LightWeightLinkedSet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.HashMap;
import java.util.ArrayList;
import java.util.Map;
import java.util.List;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.ArrayDeque;
import java.util.Queue;
/**
* This class implements the logic to track decommissioning and entering
* maintenance nodes, ensure all their blocks are adequately replicated
* before they are moved to the decommissioned or maintenance state.
*
* This monitor avoids flooding the replication queue with all pending blocks
* and instead feeds them to the queue as the prior set complete replication.
*
* HDFS-14854 contains details about the overall design of this class.
*
*/
public class DatanodeAdminBackoffMonitor extends DatanodeAdminMonitorBase
implements DatanodeAdminMonitorInterface {
/**
* Map containing the DECOMMISSION_INPROGRESS or ENTERING_MAINTENANCE
* datanodes that are being tracked so they can be be marked as
* DECOMMISSIONED or IN_MAINTENANCE. Even after the node is marked as
* IN_MAINTENANCE, the node remains in the map until
* maintenance expires checked during a monitor tick.
* <p/>
* This holds a set of references to the under-replicated blocks on the DN
* at the time the DN is added to the map, i.e. the blocks that are
* preventing the node from being marked as decommissioned. During a monitor
* tick, this list is pruned as blocks becomes replicated.
* <p/>
* Note also that the reference to the list of under-replicated blocks
* will be null on initial add
* <p/>
* However, this map can become out-of-date since it is not updated by block
* reports or other events. Before being finally marking as decommissioned,
* another check is done with the actual block map.
*/
private HashMap<DatanodeDescriptor, HashMap<BlockInfo, Integer>>
outOfServiceNodeBlocks = new HashMap<>();
/**
* Any nodes where decommission or maintenance has been cancelled are added
* to this queue for later processing.
*/
private final Queue<DatanodeDescriptor> cancelledNodes = new ArrayDeque<>();
/**
* The numbe of blocks to process when moving blocks to pendingReplication
* before releasing and reclaiming the namenode lock.
*/
private int blocksPerLock;
/**
* The number of blocks that have been checked on this tick.
*/
private int numBlocksChecked = 0;
/**
* The maximum number of blocks to hold in PendingRep at any time.
*/
private int pendingRepLimit;
/**
* The list of blocks which have been placed onto the replication queue
* and are waiting to be sufficiently replicated.
*/
private final Map<DatanodeDescriptor, List<BlockInfo>>
pendingRep = new HashMap<>();
private static final Logger LOG =
LoggerFactory.getLogger(DatanodeAdminBackoffMonitor.class);
DatanodeAdminBackoffMonitor() {
}
@Override
protected void processConf() {
this.pendingRepLimit = conf.getInt(
DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_BACKOFF_MONITOR_PENDING_LIMIT,
DFSConfigKeys.
DFS_NAMENODE_DECOMMISSION_BACKOFF_MONITOR_PENDING_LIMIT_DEFAULT);
if (this.pendingRepLimit < 1) {
LOG.error("{} is set to an invalid value, it must be greater than "+
"zero. Defaulting to {}",
DFSConfigKeys.
DFS_NAMENODE_DECOMMISSION_BACKOFF_MONITOR_PENDING_LIMIT,
DFSConfigKeys.
DFS_NAMENODE_DECOMMISSION_BACKOFF_MONITOR_PENDING_LIMIT_DEFAULT
);
this.pendingRepLimit = DFSConfigKeys.
DFS_NAMENODE_DECOMMISSION_BACKOFF_MONITOR_PENDING_LIMIT_DEFAULT;
}
this.blocksPerLock = conf.getInt(
DFSConfigKeys.
DFS_NAMENODE_DECOMMISSION_BACKOFF_MONITOR_PENDING_BLOCKS_PER_LOCK,
DFSConfigKeys.
DFS_NAMENODE_DECOMMISSION_BACKOFF_MONITOR_PENDING_BLOCKS_PER_LOCK_DEFAULT
);
if (blocksPerLock <= 0) {
LOG.error("{} is set to an invalid value, it must be greater than "+
"zero. Defaulting to {}",
DFSConfigKeys.
DFS_NAMENODE_DECOMMISSION_BACKOFF_MONITOR_PENDING_BLOCKS_PER_LOCK,
DFSConfigKeys.
DFS_NAMENODE_DECOMMISSION_BACKOFF_MONITOR_PENDING_BLOCKS_PER_LOCK_DEFAULT);
blocksPerLock =
DFSConfigKeys.
DFS_NAMENODE_DECOMMISSION_BACKOFF_MONITOR_PENDING_BLOCKS_PER_LOCK_DEFAULT;
}
LOG.info("Initialized the Backoff Decommission and Maintenance Monitor");
}
/**
* Queue a node to be removed from tracking. This method must be called
* under the namenode write lock.
* @param dn The datanode to stop tracking for decommission.
*/
@Override
public void stopTrackingNode(DatanodeDescriptor dn) {
pendingNodes.remove(dn);
cancelledNodes.add(dn);
}
@Override
public int getTrackedNodeCount() {
return outOfServiceNodeBlocks.size();
}
@Override
public int getNumNodesChecked() {
// We always check all nodes on each tick
return outOfServiceNodeBlocks.size();
}
@Override
public void run() {
LOG.debug("DatanodeAdminMonitorV2 is running.");
if (!namesystem.isRunning()) {
LOG.info("Namesystem is not running, skipping " +
"decommissioning/maintenance checks.");
return;
}
// Reset the checked count at beginning of each iteration
numBlocksChecked = 0;
// Check decommission or maintenance progress.
try {
namesystem.writeLock();
try {
/**
* Other threads can modify the pendingNode list and the cancelled
* node list, so we must process them under the NN write lock to
* prevent any concurrent modifications.
*
* Always process the cancelled list before the pending list, as
* it is possible for a node to be cancelled, and then quickly added
* back again. If we process these the other way around, the added
* node will be removed from tracking by the pending cancel.
*/
processCancelledNodes();
processPendingNodes();
} finally {
namesystem.writeUnlock();
}
// After processing the above, various parts of the check() method will
// take and drop the read / write lock as needed. Aside from the
// cancelled and pending lists, nothing outside of the monitor thread
// modifies anything inside this class, so many things can be done
// without any lock.
check();
} catch (Exception e) {
LOG.warn("DatanodeAdminMonitor caught exception when processing node.",
e);
}
if (numBlocksChecked + outOfServiceNodeBlocks.size() > 0) {
LOG.info("Checked {} blocks this tick. {} nodes are now " +
"in maintenance or transitioning state. {} nodes pending. {} " +
"nodes waiting to be cancelled.",
numBlocksChecked, outOfServiceNodeBlocks.size(), pendingNodes.size(),
cancelledNodes.size());
}
}
/**
* Move any pending nodes into outOfServiceNodeBlocks to initiate the
* decommission or maintenance mode process.
*
* This method must be executed under the namenode write lock to prevent
* the pendingNodes list from being modified externally.
*/
private void processPendingNodes() {
while (!pendingNodes.isEmpty() &&
(maxConcurrentTrackedNodes == 0 ||
outOfServiceNodeBlocks.size() < maxConcurrentTrackedNodes)) {
outOfServiceNodeBlocks.put(pendingNodes.poll(), null);
}
}
/**
* Process any nodes which have had their decommission or maintenance mode
* cancelled by an administrator.
*
* This method must be executed under the
* write lock to prevent the cancelledNodes list being modified externally.
*/
private void processCancelledNodes() {
while(!cancelledNodes.isEmpty()) {
DatanodeDescriptor dn = cancelledNodes.poll();
outOfServiceNodeBlocks.remove(dn);
pendingRep.remove(dn);
}
}
/**
* This method performs each of the steps to track a node from
* decommissioning or entering maintenance to the end state.
*
* First, any newly added nodes are scanned.
*
* Then any expired maintenance nodes are handled.
*
* Next the pendingRep map is scanned and all blocks which are now
* sufficiently replicated are removed
*
* Then new blocks are moved to pendingRep
*
* Finally we check if any nodes have completed the replication process and
* if so move them to their final states.
*
* This methods which this method calls will take and release the namenode
* read and write lock several times.
*
*/
private void check() {
final List<DatanodeDescriptor> toRemove = new ArrayList<>();
if (outOfServiceNodeBlocks.size() == 0) {
// No nodes currently being tracked so simply return
return;
}
// Check if there are any pending nodes to process, ie those where the
// storage has not been scanned yet. For all which are pending, scan
// the storage and load the under-replicated block list into
// outOfServiceNodeBlocks. As this does not modify any external structures
// it can be done under the namenode *read* lock, and the lock can be
// dropped between each storage on each node.
//
// TODO - This is an expensive call, depending on how many nodes are
// to be processed, but it requires only the read lock and it will
// be dropped and re-taken frequently. We may want to throttle this
// to process only a few nodes per iteration.
outOfServiceNodeBlocks.keySet()
.stream()
.filter(n -> outOfServiceNodeBlocks.get(n) == null)
.forEach(n -> scanDatanodeStorage(n, true));
processMaintenanceNodes();
// First check the pending replication list and remove any blocks
// which are now replicated OK. This list is constrained in size so this
// call should not be overly expensive.
processPendingReplication();
// Now move a limited number of blocks to pending
moveBlocksToPending();
// Check if any nodes have reached zero blocks and also update the stats
// exposed via JMX for all nodes still being processed.
checkForCompletedNodes(toRemove);
// Finally move the nodes to their final state if they are ready.
processCompletedNodes(toRemove);
}
/**
* Checks for any nodes which are in maintenance and if maintenance has
* expired, the node will be moved back to in_service (or dead) as required.
*/
private void processMaintenanceNodes() {
// Check for any maintenance state nodes which need to be expired
namesystem.writeLock();
try {
for (DatanodeDescriptor dn : outOfServiceNodeBlocks.keySet()) {
if (dn.isMaintenance() && dn.maintenanceExpired()) {
// If maintenance expires, stop tracking it. This can be an
// expensive call, as it may need to invalidate blocks. Therefore
// we can yield and retake the write lock after each node
//
// The call to stopMaintenance makes a call to stopTrackingNode()
// which added the node to the cancelled list. Therefore expired
// maintenance nodes do not need to be added to the toRemove list.
dnAdmin.stopMaintenance(dn);
namesystem.writeUnlock();
namesystem.writeLock();
}
}
} finally {
namesystem.writeUnlock();
}
}
/**
* Loop over all nodes in the passed toRemove list and move the node to
* the required end state. This will also remove any entries from
* outOfServiceNodeBlocks and pendingRep for the node if required.
*
* @param toRemove The list of nodes to process for completion.
*/
private void processCompletedNodes(List<DatanodeDescriptor> toRemove) {
if (toRemove.size() == 0) {
// If there are no nodes to process simply return and avoid
// taking the write lock at all.
return;
}
namesystem.writeLock();
try {
for (DatanodeDescriptor dn : toRemove) {
final boolean isHealthy =
blockManager.isNodeHealthyForDecommissionOrMaintenance(dn);
if (isHealthy) {
if (dn.isDecommissionInProgress()) {
dnAdmin.setDecommissioned(dn);
outOfServiceNodeBlocks.remove(dn);
pendingRep.remove(dn);
} else if (dn.isEnteringMaintenance()) {
// IN_MAINTENANCE node remains in the outOfServiceNodeBlocks to
// to track maintenance expiration.
dnAdmin.setInMaintenance(dn);
pendingRep.remove(dn);
} else if (dn.isInService()) {
// Decom / maint was cancelled and the node is yet to be processed
// from cancelledNodes
LOG.info("Node {} completed decommission and maintenance " +
"but has been moved back to in service", dn);
pendingRep.remove(dn);
outOfServiceNodeBlocks.remove(dn);
continue;
} else {
// Should not happen
LOG.error("Node {} is in an unexpected state {} and has been "+
"removed from tracking for decommission or maintenance",
dn, dn.getAdminState());
pendingRep.remove(dn);
outOfServiceNodeBlocks.remove(dn);
continue;
}
LOG.info("Node {} is sufficiently replicated and healthy, "
+ "marked as {}.", dn, dn.getAdminState());
} else {
LOG.info("Node {} isn't healthy."
+ " It needs to replicate {} more blocks."
+ " {} is still in progress.", dn,
getPendingCountForNode(dn), dn.getAdminState());
}
}
} finally {
namesystem.writeUnlock();
}
}
/**
* Loop over all nodes and check for any which have zero unprocessed or
* pending blocks. If the node has zero blocks pending, the storage is
* rescanned to ensure no transient blocks were missed on the first pass.
*
* If, after rescan the number of blocks pending replication is zero, the
* node is added to the passed removeList which will later be processed to
* complete the decommission or entering maintenance process.
*
* @param removeList Nodes which have zero pending blocks are added to this
* list.
*/
private void checkForCompletedNodes(List<DatanodeDescriptor> removeList) {
for (DatanodeDescriptor dn : outOfServiceNodeBlocks.keySet()) {
// If the node is already in maintenance, we don't need to perform
// any further checks on it.
if (dn.isInMaintenance()) {
LOG.debug("Node {} is currently in maintenance", dn);
continue;
} else if (!dn.isInService()) {
// A node could be inService if decom or maint has been cancelled, but
// the cancelled list is yet to be processed. We don't need to check
// inService nodes here
int outstandingBlocks = getPendingCountForNode(dn);
if (outstandingBlocks == 0) {
scanDatanodeStorage(dn, false);
outstandingBlocks = getPendingCountForNode(dn);
}
LOG.info("Node {} has {} blocks yet to process", dn, outstandingBlocks);
if (outstandingBlocks == 0) {
removeList.add(dn);
}
}
}
}
/**
* Returns the number of block pending for the given node by adding those
* blocks in pendingRep and outOfServiceNodeBlocks.
*
* @param dn The datanode to return the count for
* @return The total block count, or zero if none are pending
*/
private int getPendingCountForNode(DatanodeDescriptor dn) {
int count = 0;
HashMap<BlockInfo, Integer> blocks = outOfServiceNodeBlocks.get(dn);
if (blocks != null) {
count += blocks.size();
}
List<BlockInfo> pendingBlocks = pendingRep.get(dn);
if (pendingBlocks != null) {
count += pendingBlocks.size();
}
return count;
}
/**
* Iterate across all nodes in outOfServiceNodeBlocks which have blocks yet
* to be processed.
*
* The block is removed from outOfServiceNodeBlocks and if it needs
* replication it is added to the pendingRep map and also to the
* BlockManager replication queue.
*
* Any block that does not need replication is discarded.
*
* The method will return when there are the pendingRep map has
* pendingRepLimit blocks or there are no further blocks to process.
*/
private void moveBlocksToPending() {
int blocksProcessed = 0;
int pendingCount = getPendingCount();
int yetToBeProcessed = getYetToBeProcessedCount();
if (pendingCount == 0 && yetToBeProcessed == 0) {
// There are no blocks to process so just return
LOG.debug("There are no pending or blocks yet to be processed");
return;
}
namesystem.writeLock();
try {
long repQueueSize = blockManager.getLowRedundancyBlocksCount();
LOG.info("There are {} blocks pending replication and the limit is "+
"{}. A further {} blocks are waiting to be processed. "+
"The replication queue currently has {} blocks",
pendingCount, pendingRepLimit, yetToBeProcessed, repQueueSize);
if (pendingCount >= pendingRepLimit) {
// Only add more blocks to the replication queue if we don't already
// have too many pending
return;
}
// Create a "Block Iterator" for each node decommissioning or entering
// maintenance. These iterators will be used "round robined" to add blocks
// to the replication queue and PendingRep
HashMap<DatanodeDescriptor, Iterator<BlockInfo>>
iterators = new HashMap<>();
for (Map.Entry<DatanodeDescriptor, HashMap<BlockInfo, Integer>> e
: outOfServiceNodeBlocks.entrySet()) {
iterators.put(e.getKey(), e.getValue().keySet().iterator());
}
// Now loop until we fill the pendingRep map with pendingRepLimit blocks
// or run out of blocks to add.
Iterator<DatanodeDescriptor> nodeIter =
Iterables.cycle(iterators.keySet()).iterator();
while (nodeIter.hasNext()) {
// Cycle through each node with blocks which still need processed
DatanodeDescriptor dn = nodeIter.next();
Iterator<BlockInfo> blockIt = iterators.get(dn);
while (blockIt.hasNext()) {
// Process the blocks for the node until we find one that needs
// replication
if (blocksProcessed >= blocksPerLock) {
blocksProcessed = 0;
namesystem.writeUnlock();
namesystem.writeLock();
}
blocksProcessed++;
if (nextBlockAddedToPending(blockIt, dn)) {
// Exit the inner "block" loop so an iterator for the next datanode
// is used for the next block.
pendingCount++;
break;
}
}
if (!blockIt.hasNext()) {
// remove the iterator as there are no blocks left in it
nodeIter.remove();
}
if (pendingCount >= pendingRepLimit) {
// We have scheduled the limit of blocks for replication, so do
// not add any more
break;
}
}
} finally {
namesystem.writeUnlock();
}
LOG.debug("{} blocks are now pending replication", pendingCount);
}
/**
* Takes and removes the next block from the given iterator and checks if it
* needs additional replicas. If it does, it will be scheduled for
* reconstruction and added to the pendingRep map.
* @param it The iterator to take the next block from
* @param dn The datanodeDescriptor the iterator applies to
* @return True if the block needs replication, otherwise false
*/
private boolean nextBlockAddedToPending(Iterator<BlockInfo> it,
DatanodeDescriptor dn) {
BlockInfo block = it.next();
it.remove();
numBlocksChecked++;
if (!isBlockReplicatedOk(dn, block, true, null)) {
pendingRep.computeIfAbsent(dn, k -> new LinkedList<>()).add(block);
return true;
}
return false;
}
private int getPendingCount() {
if (pendingRep.size() == 0) {
return 0;
}
return pendingRep.values()
.stream()
.map(a -> a.size())
.reduce(0, (a, b) -> a + b);
}
private int getYetToBeProcessedCount() {
if (outOfServiceNodeBlocks.size() == 0) {
return 0;
}
return outOfServiceNodeBlocks.values()
.stream()
.map(a -> a.size())
.reduce(0, (a, b) -> a + b);
}
/**
* Scan all the blocks held on a datanodes. For a node being decommissioned
* we assume that the majority of blocks on the node will need to have new
* replicas made, and therefore we do not check if they are under replicated
* here and instead add them to the list of blocks to track.
*
* For a node being moved into maintenance, we assume most blocks will be
* replicated OK and hence we do check their under-replicated status here,
* hopefully reducing the number of blocks to track.
*
* On a re-scan (initalScan = false) we assume the node has been processed
* already, and hence there should be few under-replicated blocks, so we
* check the under-replicated status before adding the blocks to the
* tracking list.
*
* This means that for a node being decomission there should be a large
* number of blocks to process later but for maintenance, a smaller number.
*
* As this method does not schedule any blocks for reconstuction, this
* scan can be performed under the namenode readlock, and the lock is
* dropped and reaquired for each storage on the DN.
*
* @param dn - The datanode to process
* @param initialScan - True is this is the first time scanning the node
* or false if it is a rescan.
*/
private void scanDatanodeStorage(DatanodeDescriptor dn,
Boolean initialScan) {
HashMap<BlockInfo, Integer> blockList = outOfServiceNodeBlocks.get(dn);
if (blockList == null) {
blockList = new HashMap<>();
outOfServiceNodeBlocks.put(dn, blockList);
}
DatanodeStorageInfo[] storage;
namesystem.readLock();
try {
storage = dn.getStorageInfos();
} finally {
namesystem.readUnlock();
}
for (DatanodeStorageInfo s : storage) {
namesystem.readLock();
try {
// As the lock is dropped and re-taken between each storage, we need
// to check the storage is still present before processing it, as it
// may have been removed.
if (dn.getStorageInfo(s.getStorageID()) == null) {
continue;
}
Iterator<BlockInfo> it = s.getBlockIterator();
while (it.hasNext()) {
BlockInfo b = it.next();
if (!initialScan || dn.isEnteringMaintenance()) {
// this is a rescan, so most blocks should be replicated now,
// or this node is going into maintenance. On a healthy
// cluster using racks or upgrade domain, a node should be
// able to go into maintenance without replicating many blocks
// so we will check them immediately.
if (!isBlockReplicatedOk(dn, b, false, null)) {
blockList.put(b, null);
}
} else {
blockList.put(b, null);
}
numBlocksChecked++;
}
} finally {
namesystem.readUnlock();
}
}
}
/**
* Process the list of pendingReplication Blocks. These are the blocks
* which have been moved from outOfServiceNodeBlocks, confirmed to be
* under-replicated and were added to the blockManager replication
* queue.
*
* Any blocks which have been confirmed to be replicated sufficiently are
* removed from the list.
*
* The datanode stats are also updated in this method, updating the total
* pending block count, the number of blocks in PendingRep which are in
* open files and the number of blocks in PendingRep which are only on
* out of service nodes.
*
* As this method makes changes to the replication queue, it acquires the
* namenode write lock while it runs.
*/
private void processPendingReplication() {
namesystem.writeLock();
try {
for (Iterator<Map.Entry<DatanodeDescriptor, List<BlockInfo>>>
entIt = pendingRep.entrySet().iterator(); entIt.hasNext();) {
Map.Entry<DatanodeDescriptor, List<BlockInfo>> entry = entIt.next();
DatanodeDescriptor dn = entry.getKey();
List<BlockInfo> blocks = entry.getValue();
if (blocks == null) {
// should not be able to happen
entIt.remove();
continue;
}
Iterator<BlockInfo> blockIt = blocks.iterator();
BlockStats suspectBlocks = new BlockStats();
while(blockIt.hasNext()) {
BlockInfo b = blockIt.next();
if (isBlockReplicatedOk(dn, b, true, suspectBlocks)) {
blockIt.remove();
}
numBlocksChecked++;
}
if (blocks.size() == 0) {
entIt.remove();
}
// Update metrics for this datanode.
dn.getLeavingServiceStatus().set(
suspectBlocks.getOpenFileCount(),
suspectBlocks.getOpenFiles(),
getPendingCountForNode(dn),
suspectBlocks.getOutOfServiceBlockCount());
}
} finally {
namesystem.writeUnlock();
}
}
/**
* Checks if a block is sufficiently replicated and optionally schedules
* it for reconstruction if it is not.
*
* If a BlockStats object is passed, this method will also update it if the
* block is part of an open file or only on outOfService nodes.
*
* @param datanode The datanode the block belongs to
* @param block The block to check
* @param scheduleReconStruction Whether to add the block to the replication
* queue if it is not sufficiently replicated.
* Passing true will add it to the replication
* queue, and false will not.
* @param suspectBlocks If non-null check if the block is part of an open
* file or only on out of service nodes and update the
* passed object accordingly.
* @return
*/
private boolean isBlockReplicatedOk(DatanodeDescriptor datanode,
BlockInfo block, Boolean scheduleReconStruction,
BlockStats suspectBlocks) {
if (blockManager.blocksMap.getStoredBlock(block) == null) {
LOG.trace("Removing unknown block {}", block);
return true;
}
long bcId = block.getBlockCollectionId();
if (bcId == INodeId.INVALID_INODE_ID) {
// Orphan block, will be invalidated eventually. Skip.
return false;
}
final BlockCollection bc = blockManager.getBlockCollection(block);
final NumberReplicas num = blockManager.countNodes(block);
final int liveReplicas = num.liveReplicas();
// Schedule low redundancy blocks for reconstruction
// if not already pending.
boolean isDecommission = datanode.isDecommissionInProgress();
boolean isMaintenance = datanode.isEnteringMaintenance();
boolean neededReconstruction = isDecommission ?
blockManager.isNeededReconstruction(block, num) :
blockManager.isNeededReconstructionForMaintenance(block, num);
if (neededReconstruction && scheduleReconStruction) {
if (!blockManager.neededReconstruction.contains(block) &&
blockManager.pendingReconstruction.getNumReplicas(block) == 0 &&
blockManager.isPopulatingReplQueues()) {
// Process these blocks only when active NN is out of safe mode.
blockManager.neededReconstruction.add(block,
liveReplicas, num.readOnlyReplicas(),
num.outOfServiceReplicas(),
blockManager.getExpectedRedundancyNum(block));
}
}
if (suspectBlocks != null) {
// Only if we pass a BlockStats object should we do these
// checks, as they should only be checked when processing PendingRep.
if (bc.isUnderConstruction()) {
INode ucFile = namesystem.getFSDirectory().getInode(bc.getId());
if (!(ucFile instanceof INodeFile) ||
!ucFile.asFile().isUnderConstruction()) {
LOG.warn("File {} is not under construction. Skipping add to " +
"low redundancy open files!", ucFile.getLocalName());
} else {
suspectBlocks.addOpenFile(ucFile.getId());
}
}
if ((liveReplicas == 0) && (num.outOfServiceReplicas() > 0)) {
suspectBlocks.incrementOutOfServiceBlocks();
}
}
// Even if the block is without sufficient redundancy,
// it might not block decommission/maintenance if it
// has sufficient redundancy.
if (dnAdmin.isSufficient(block, bc, num, isDecommission, isMaintenance)) {
return true;
}
return false;
}
static class BlockStats {
private LightWeightHashSet<Long> openFiles =
new LightWeightLinkedSet<>();
private int openFileBlockCount = 0;
private int outOfServiceBlockCount = 0;
public void addOpenFile(long id) {
// Several blocks can be part of the same file so track how
// many adds we get, as the same file could be added several times
// for different blocks.
openFileBlockCount++;
openFiles.add(id);
}
public void incrementOutOfServiceBlocks() {
outOfServiceBlockCount++;
}
public LightWeightHashSet<Long> getOpenFiles() {
return openFiles;
}
public int getOpenFileCount() {
return openFileBlockCount;
}
public int getOutOfServiceBlockCount() {
return outOfServiceBlockCount;
}
}
}

446
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminDefaultMonitor.java Normal file
View File

@ -0,0 +1,446 @@
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hdfs.server.blockmanagement;
import com.google.common.base.Preconditions;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.protocol.DatanodeID;
import org.apache.hadoop.hdfs.server.namenode.INode;
import org.apache.hadoop.hdfs.server.namenode.INodeFile;
import org.apache.hadoop.hdfs.server.namenode.INodeId;
import org.apache.hadoop.hdfs.util.CyclicIteration;
import org.apache.hadoop.hdfs.util.LightWeightHashSet;
import org.apache.hadoop.hdfs.util.LightWeightLinkedSet;
import org.apache.hadoop.util.ChunkedArrayList;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.AbstractList;
import java.util.TreeMap;
import java.util.ArrayList;
import java.util.Map;
import java.util.List;
import java.util.Iterator;
/**
* Checks to see if datanodes have finished DECOMMISSION_INPROGRESS or
* ENTERING_MAINTENANCE state.
* <p/>
* Since this is done while holding the namesystem lock,
* the amount of work per monitor tick is limited.
*/
public class DatanodeAdminDefaultMonitor extends DatanodeAdminMonitorBase
implements DatanodeAdminMonitorInterface {
/**
* Map containing the DECOMMISSION_INPROGRESS or ENTERING_MAINTENANCE
* datanodes that are being tracked so they can be be marked as
* DECOMMISSIONED or IN_MAINTENANCE. Even after the node is marked as
* IN_MAINTENANCE, the node remains in the map until
* maintenance expires checked during a monitor tick.
* <p/>
* This holds a set of references to the under-replicated blocks on the DN
* at the time the DN is added to the map, i.e. the blocks that are
* preventing the node from being marked as decommissioned. During a monitor
* tick, this list is pruned as blocks becomes replicated.
* <p/>
* Note also that the reference to the list of under-replicated blocks
* will be null on initial add
* <p/>
* However, this map can become out-of-date since it is not updated by block
* reports or other events. Before being finally marking as decommissioned,
* another check is done with the actual block map.
*/
private final TreeMap<DatanodeDescriptor, AbstractList<BlockInfo>>
outOfServiceNodeBlocks;
/**
* The maximum number of blocks to check per tick.
*/
private int numBlocksPerCheck;
/**
* The number of blocks that have been checked on this tick.
*/
private int numBlocksChecked = 0;
/**
* The number of blocks checked after (re)holding lock.
*/
private int numBlocksCheckedPerLock = 0;
/**
* The number of nodes that have been checked on this tick. Used for
* statistics.
*/
private int numNodesChecked = 0;
/**
* The last datanode in outOfServiceNodeBlocks that we've processed.
*/
private DatanodeDescriptor iterkey = new DatanodeDescriptor(
new DatanodeID("", "", "", 0, 0, 0, 0));
private static final Logger LOG =
LoggerFactory.getLogger(DatanodeAdminDefaultMonitor.class);
DatanodeAdminDefaultMonitor() {
this.outOfServiceNodeBlocks = new TreeMap<>();
}
@Override
protected void processConf() {
numBlocksPerCheck = conf.getInt(
DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_BLOCKS_PER_INTERVAL_KEY,
DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_BLOCKS_PER_INTERVAL_DEFAULT);
if (numBlocksPerCheck <= 0) {
LOG.error("{} must be greater than zero. Defaulting to {}",
DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_BLOCKS_PER_INTERVAL_KEY,
DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_BLOCKS_PER_INTERVAL_DEFAULT);
numBlocksPerCheck =
DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_BLOCKS_PER_INTERVAL_DEFAULT;
}
LOG.info("Initialized the Default Decommission and Maintenance monitor");
}
private boolean exceededNumBlocksPerCheck() {
LOG.trace("Processed {} blocks so far this tick", numBlocksChecked);
return numBlocksChecked >= numBlocksPerCheck;
}
@Override
public void stopTrackingNode(DatanodeDescriptor dn) {
pendingNodes.remove(dn);
outOfServiceNodeBlocks.remove(dn);
}
@Override
public int getTrackedNodeCount() {
return outOfServiceNodeBlocks.size();
}
@Override
public int getNumNodesChecked() {
return numNodesChecked;
}
@Override
public void run() {
LOG.debug("DatanodeAdminMonitor is running.");
if (!namesystem.isRunning()) {
LOG.info("Namesystem is not running, skipping " +
"decommissioning/maintenance checks.");
return;
}
// Reset the checked count at beginning of each iteration
numBlocksChecked = 0;
numBlocksCheckedPerLock = 0;
numNodesChecked = 0;
// Check decommission or maintenance progress.
namesystem.writeLock();
try {
processPendingNodes();
check();
} catch (Exception e) {
LOG.warn("DatanodeAdminMonitor caught exception when processing node.",
e);
} finally {
namesystem.writeUnlock();
}
if (numBlocksChecked + numNodesChecked > 0) {
LOG.info("Checked {} blocks and {} nodes this tick. {} nodes are now " +
"in maintenance or transitioning state. {} nodes pending.",
numBlocksChecked, numNodesChecked, outOfServiceNodeBlocks.size(),
pendingNodes.size());
}
}
/**
* Pop datanodes off the pending list and into decomNodeBlocks,
* subject to the maxConcurrentTrackedNodes limit.
*/
private void processPendingNodes() {
while (!pendingNodes.isEmpty() &&
(maxConcurrentTrackedNodes == 0 ||
outOfServiceNodeBlocks.size() < maxConcurrentTrackedNodes)) {
outOfServiceNodeBlocks.put(pendingNodes.poll(), null);
}
}
private void check() {
final Iterator<Map.Entry<DatanodeDescriptor, AbstractList<BlockInfo>>>
it = new CyclicIteration<>(outOfServiceNodeBlocks,
iterkey).iterator();
final List<DatanodeDescriptor> toRemove = new ArrayList<>();
while (it.hasNext() && !exceededNumBlocksPerCheck() && namesystem
.isRunning()) {
numNodesChecked++;
final Map.Entry<DatanodeDescriptor, AbstractList<BlockInfo>>
entry = it.next();
final DatanodeDescriptor dn = entry.getKey();
try {
AbstractList<BlockInfo> blocks = entry.getValue();
boolean fullScan = false;
if (dn.isMaintenance() && dn.maintenanceExpired()) {
// If maintenance expires, stop tracking it.
dnAdmin.stopMaintenance(dn);
toRemove.add(dn);
continue;
}
if (dn.isInMaintenance()) {
// The dn is IN_MAINTENANCE and the maintenance hasn't expired yet.
continue;
}
if (blocks == null) {
// This is a newly added datanode, run through its list to schedule
// under-replicated blocks for replication and collect the blocks
// that are insufficiently replicated for further tracking
LOG.debug("Newly-added node {}, doing full scan to find " +
"insufficiently-replicated blocks.", dn);
blocks = handleInsufficientlyStored(dn);
outOfServiceNodeBlocks.put(dn, blocks);
fullScan = true;
} else {
// This is a known datanode, check if its # of insufficiently
// replicated blocks has dropped to zero and if it can move
// to the next state.
LOG.debug("Processing {} node {}", dn.getAdminState(), dn);
pruneReliableBlocks(dn, blocks);
}
if (blocks.size() == 0) {
if (!fullScan) {
// If we didn't just do a full scan, need to re-check with the
// full block map.
//
// We've replicated all the known insufficiently replicated
// blocks. Re-check with the full block map before finally
// marking the datanode as DECOMMISSIONED or IN_MAINTENANCE.
LOG.debug("Node {} has finished replicating current set of "
+ "blocks, checking with the full block map.", dn);
blocks = handleInsufficientlyStored(dn);
outOfServiceNodeBlocks.put(dn, blocks);
}
// If the full scan is clean AND the node liveness is okay,
// we can finally mark as DECOMMISSIONED or IN_MAINTENANCE.
final boolean isHealthy =
blockManager.isNodeHealthyForDecommissionOrMaintenance(dn);
if (blocks.size() == 0 && isHealthy) {
if (dn.isDecommissionInProgress()) {
dnAdmin.setDecommissioned(dn);
toRemove.add(dn);
} else if (dn.isEnteringMaintenance()) {
// IN_MAINTENANCE node remains in the outOfServiceNodeBlocks to
// to track maintenance expiration.
dnAdmin.setInMaintenance(dn);
} else {
Preconditions.checkState(false,
"Node %s is in an invalid state! "
+ "Invalid state: %s %s blocks are on this dn.",
dn, dn.getAdminState(), blocks.size());
}
LOG.debug("Node {} is sufficiently replicated and healthy, "
+ "marked as {}.", dn, dn.getAdminState());
} else {
LOG.info("Node {} {} healthy."
+ " It needs to replicate {} more blocks."
+ " {} is still in progress.", dn,
isHealthy ? "is": "isn't", blocks.size(), dn.getAdminState());
}
} else {
LOG.info("Node {} still has {} blocks to replicate "
+ "before it is a candidate to finish {}.",
dn, blocks.size(), dn.getAdminState());
}
} catch (Exception e) {
// Log and postpone to process node when meet exception since it is in
// an invalid state.
LOG.warn("DatanodeAdminMonitor caught exception when processing node "
+ "{}.", dn, e);
pendingNodes.add(dn);
toRemove.add(dn);
} finally {
iterkey = dn;
}
}
// Remove the datanodes that are DECOMMISSIONED or in service after
// maintenance expiration.
for (DatanodeDescriptor dn : toRemove) {
Preconditions.checkState(dn.isDecommissioned() || dn.isInService(),
"Removing node %s that is not yet decommissioned or in service!",
dn);
outOfServiceNodeBlocks.remove(dn);
}
}
/**
* Removes reliable blocks from the block list of a datanode.
*/
private void pruneReliableBlocks(final DatanodeDescriptor datanode,
AbstractList<BlockInfo> blocks) {
processBlocksInternal(datanode, blocks.iterator(), null, true);
}
/**
* Returns a list of blocks on a datanode that are insufficiently
* replicated or require recovery, i.e. requiring recovery and
* should prevent decommission or maintenance.
* <p/>
* As part of this, it also schedules replication/recovery work.
*
* @return List of blocks requiring recovery
*/
private AbstractList<BlockInfo> handleInsufficientlyStored(
final DatanodeDescriptor datanode) {
AbstractList<BlockInfo> insufficient = new ChunkedArrayList<>();
processBlocksInternal(datanode, datanode.getBlockIterator(),
insufficient, false);
return insufficient;
}
/**
* Used while checking if DECOMMISSION_INPROGRESS datanodes can be
* marked as DECOMMISSIONED or ENTERING_MAINTENANCE datanodes can be
* marked as IN_MAINTENANCE. Combines shared logic of pruneReliableBlocks
* and handleInsufficientlyStored.
*
* @param datanode Datanode
* @param it Iterator over the blocks on the
* datanode
* @param insufficientList Return parameter. If it's not null,
* will contain the insufficiently
* replicated-blocks from the list.
* @param pruneReliableBlocks whether to remove blocks reliable
* enough from the iterator
*/
private void processBlocksInternal(
final DatanodeDescriptor datanode,
final Iterator<BlockInfo> it,
final List<BlockInfo> insufficientList,
boolean pruneReliableBlocks) {
boolean firstReplicationLog = true;
// Low redundancy in UC Blocks only
int lowRedundancyBlocksInOpenFiles = 0;
LightWeightHashSet<Long> lowRedundancyOpenFiles =
new LightWeightLinkedSet<>();
// All low redundancy blocks. Includes lowRedundancyOpenFiles.
int lowRedundancyBlocks = 0;
// All maintenance and decommission replicas.
int outOfServiceOnlyReplicas = 0;
while (it.hasNext()) {
if (insufficientList == null
&& numBlocksCheckedPerLock >= numBlocksPerCheck) {
// During fullscan insufficientlyReplicated will NOT be null, iterator
// will be DN's iterator. So should not yield lock, otherwise
// ConcurrentModificationException could occur.
// Once the fullscan done, iterator will be a copy. So can yield the
// lock.
// Yielding is required in case of block number is greater than the
// configured per-iteration-limit.
namesystem.writeUnlock();
try {
LOG.debug("Yielded lock during decommission/maintenance check");
Thread.sleep(0, 500);
} catch (InterruptedException ignored) {
return;
}
// reset
numBlocksCheckedPerLock = 0;
namesystem.writeLock();
}
numBlocksChecked++;
numBlocksCheckedPerLock++;
final BlockInfo block = it.next();
// Remove the block from the list if it's no longer in the block map,
// e.g. the containing file has been deleted
if (blockManager.blocksMap.getStoredBlock(block) == null) {
LOG.trace("Removing unknown block {}", block);
it.remove();
continue;
}
long bcId = block.getBlockCollectionId();
if (bcId == INodeId.INVALID_INODE_ID) {
// Orphan block, will be invalidated eventually. Skip.
continue;
}
final BlockCollection bc = blockManager.getBlockCollection(block);
final NumberReplicas num = blockManager.countNodes(block);
final int liveReplicas = num.liveReplicas();
// Schedule low redundancy blocks for reconstruction
// if not already pending.
boolean isDecommission = datanode.isDecommissionInProgress();
boolean isMaintenance = datanode.isEnteringMaintenance();
boolean neededReconstruction = isDecommission ?
blockManager.isNeededReconstruction(block, num) :
blockManager.isNeededReconstructionForMaintenance(block, num);
if (neededReconstruction) {
if (!blockManager.neededReconstruction.contains(block) &&
blockManager.pendingReconstruction.getNumReplicas(block) == 0 &&
blockManager.isPopulatingReplQueues()) {
// Process these blocks only when active NN is out of safe mode.
blockManager.neededReconstruction.add(block,
liveReplicas, num.readOnlyReplicas(),
num.outOfServiceReplicas(),
blockManager.getExpectedRedundancyNum(block));
}
}
// Even if the block is without sufficient redundancy,
// it might not block decommission/maintenance if it
// has sufficient redundancy.
if (dnAdmin.isSufficient(block, bc, num, isDecommission, isMaintenance)) {
if (pruneReliableBlocks) {
it.remove();
}
continue;
}
// We've found a block without sufficient redundancy.
if (insufficientList != null) {
insufficientList.add(block);
}
// Log if this is our first time through
if (firstReplicationLog) {
dnAdmin.logBlockReplicationInfo(block, bc, datanode, num,
blockManager.blocksMap.getStorages(block));
firstReplicationLog = false;
}
// Update various counts
lowRedundancyBlocks++;
if (bc.isUnderConstruction()) {
INode ucFile = namesystem.getFSDirectory().getInode(bc.getId());
if (!(ucFile instanceof INodeFile) ||
!ucFile.asFile().isUnderConstruction()) {
LOG.warn("File {} is not under construction. Skipping add to " +
"low redundancy open files!", ucFile.getLocalName());
} else {
lowRedundancyBlocksInOpenFiles++;
lowRedundancyOpenFiles.add(ucFile.getId());
}
}
if ((liveReplicas == 0) && (num.outOfServiceReplicas() > 0)) {
outOfServiceOnlyReplicas++;
}
}
datanode.getLeavingServiceStatus().set(lowRedundancyBlocksInOpenFiles,
lowRedundancyOpenFiles, lowRedundancyBlocks,
outOfServiceOnlyReplicas);
}
}

449
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminManager.java
View File

@ -20,37 +20,20 @@ package org.apache.hadoop.hdfs.server.blockmanagement;
import static com.google.common.base.Preconditions.checkArgument;
import static org.apache.hadoop.util.Time.monotonicNow;
import java.util.AbstractList;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.TreeMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.protocol.DatanodeID;
import org.apache.hadoop.hdfs.server.namenode.INode;
import org.apache.hadoop.hdfs.server.namenode.INodeFile;
import org.apache.hadoop.hdfs.server.namenode.INodeId;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.hdfs.server.namenode.Namesystem;
import org.apache.hadoop.hdfs.util.CyclicIteration;
import org.apache.hadoop.hdfs.util.LightWeightHashSet;
import org.apache.hadoop.hdfs.util.LightWeightLinkedSet;
import org.apache.hadoop.util.ChunkedArrayList;
import org.apache.hadoop.util.ReflectionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
/**
@ -100,35 +83,7 @@ public class DatanodeAdminManager {
private final HeartbeatManager hbManager;
private final ScheduledExecutorService executor;
/**
* Map containing the DECOMMISSION_INPROGRESS or ENTERING_MAINTENANCE
* datanodes that are being tracked so they can be be marked as
* DECOMMISSIONED or IN_MAINTENANCE. Even after the node is marked as
* IN_MAINTENANCE, the node remains in the map until
* maintenance expires checked during a monitor tick.
* <p/>
* This holds a set of references to the under-replicated blocks on the DN at
* the time the DN is added to the map, i.e. the blocks that are preventing
* the node from being marked as decommissioned. During a monitor tick, this
* list is pruned as blocks becomes replicated.
* <p/>
* Note also that the reference to the list of under-replicated blocks
* will be null on initial add
* <p/>
* However, this map can become out-of-date since it is not updated by block
* reports or other events. Before being finally marking as decommissioned,
* another check is done with the actual block map.
*/
private final TreeMap<DatanodeDescriptor, AbstractList<BlockInfo>>
outOfServiceNodeBlocks;
/**
* Tracking a node in outOfServiceNodeBlocks consumes additional memory. To
* limit the impact on NN memory consumption, we limit the number of nodes in
* outOfServiceNodeBlocks. Additional nodes wait in pendingNodes.
*/
private final Queue<DatanodeDescriptor> pendingNodes;
private Monitor monitor = null;
private DatanodeAdminMonitorInterface monitor = null;
DatanodeAdminManager(final Namesystem namesystem,
final BlockManager blockManager, final HeartbeatManager hbManager) {
@ -139,8 +94,6 @@ public class DatanodeAdminManager {
executor = Executors.newScheduledThreadPool(1,
new ThreadFactoryBuilder().setNameFormat("DatanodeAdminMonitor-%d")
.setDaemon(true).build());
outOfServiceNodeBlocks = new TreeMap<>();
pendingNodes = new ArrayDeque<>();
}
/**
@ -181,7 +134,20 @@ public class DatanodeAdminManager {
"value for "
+ DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_MAX_CONCURRENT_TRACKED_NODES);
monitor = new Monitor(blocksPerInterval, maxConcurrentTrackedNodes);
Class cls = null;
try {
cls = conf.getClass(
DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_MONITOR_CLASS,
DatanodeAdminDefaultMonitor.class);
monitor =
(DatanodeAdminMonitorInterface)ReflectionUtils.newInstance(cls, conf);
monitor.setBlockManager(blockManager);
monitor.setNameSystem(namesystem);
monitor.setDatanodeAdminManager(this);
} catch (Exception e) {
throw new RuntimeException("Unable to create the Decommission monitor " +
"from "+cls, e);
}
executor.scheduleAtFixedRate(monitor, intervalSecs, intervalSecs,
TimeUnit.SECONDS);
@ -217,7 +183,7 @@ public class DatanodeAdminManager {
node, storage, storage.numBlocks());
}
node.getLeavingServiceStatus().setStartTime(monotonicNow());
pendingNodes.add(node);
monitor.startTrackingNode(node);
}
} else {
LOG.trace("startDecommission: Node {} in {}, nothing to do.",
@ -240,8 +206,7 @@ public class DatanodeAdminManager {
blockManager.processExtraRedundancyBlocksOnInService(node);
}
// Remove from tracking in DatanodeAdminManager
pendingNodes.remove(node);
outOfServiceNodeBlocks.remove(node);
monitor.stopTrackingNode(node);
} else {
LOG.trace("stopDecommission: Node {} in {}, nothing to do.",
node, node.getAdminState());
@ -271,7 +236,7 @@ public class DatanodeAdminManager {
}
// Track the node regardless whether it is ENTERING_MAINTENANCE or
// IN_MAINTENANCE to support maintenance expiration.
pendingNodes.add(node);
monitor.startTrackingNode(node);
} else {
LOG.trace("startMaintenance: Node {} in {}, nothing to do.",
node, node.getAdminState());
@ -319,20 +284,19 @@ public class DatanodeAdminManager {
}
// Remove from tracking in DatanodeAdminManager
pendingNodes.remove(node);
outOfServiceNodeBlocks.remove(node);
monitor.stopTrackingNode(node);
} else {
LOG.trace("stopMaintenance: Node {} in {}, nothing to do.",
node, node.getAdminState());
}
}
private void setDecommissioned(DatanodeDescriptor dn) {
protected void setDecommissioned(DatanodeDescriptor dn) {
dn.setDecommissioned();
LOG.info("Decommissioning complete for node {}", dn);
}
private void setInMaintenance(DatanodeDescriptor dn) {
protected void setInMaintenance(DatanodeDescriptor dn) {
dn.setInMaintenance();
LOG.info("Node {} has entered maintenance mode.", dn);
}
@ -344,7 +308,7 @@ public class DatanodeAdminManager {
* always necessary, hence "sufficient".
* @return true if sufficient, else false.
*/
private boolean isSufficient(BlockInfo block, BlockCollection bc,
protected boolean isSufficient(BlockInfo block, BlockCollection bc,
NumberReplicas numberReplicas,
boolean isDecommission,
boolean isMaintenance) {
@ -388,7 +352,7 @@ public class DatanodeAdminManager {
return false;
}
private void logBlockReplicationInfo(BlockInfo block,
protected void logBlockReplicationInfo(BlockInfo block,
BlockCollection bc,
DatanodeDescriptor srcNode, NumberReplicas num,
Iterable<DatanodeStorageInfo> storages) {
@ -423,380 +387,27 @@ public class DatanodeAdminManager {
@VisibleForTesting
public int getNumPendingNodes() {
return pendingNodes.size();
return monitor.getPendingNodeCount();
}
@VisibleForTesting
public int getNumTrackedNodes() {
return outOfServiceNodeBlocks.size();
return monitor.getTrackedNodeCount();
}
@VisibleForTesting
public int getNumNodesChecked() {
return monitor.numNodesChecked;
return monitor.getNumNodesChecked();
}
@VisibleForTesting
public Queue<DatanodeDescriptor> getPendingNodes() {
return pendingNodes;
}
/**
* Checks to see if datanodes have finished DECOMMISSION_INPROGRESS or
* ENTERING_MAINTENANCE state.
* <p/>
* Since this is done while holding the namesystem lock,
* the amount of work per monitor tick is limited.
*/
private class Monitor implements Runnable {
/**
* The maximum number of blocks to check per tick.
*/
private final int numBlocksPerCheck;
/**
* The maximum number of nodes to track in outOfServiceNodeBlocks.
* A value of 0 means no limit.
*/
private final int maxConcurrentTrackedNodes;
/**
* The number of blocks that have been checked on this tick.
*/
private int numBlocksChecked = 0;
/**
* The number of blocks checked after (re)holding lock.
*/
private int numBlocksCheckedPerLock = 0;
/**
* The number of nodes that have been checked on this tick. Used for
* statistics.
*/
private int numNodesChecked = 0;
/**
* The last datanode in outOfServiceNodeBlocks that we've processed.
*/
private DatanodeDescriptor iterkey = new DatanodeDescriptor(
new DatanodeID("", "", "", 0, 0, 0, 0));
Monitor(int numBlocksPerCheck, int maxConcurrentTrackedNodes) {
this.numBlocksPerCheck = numBlocksPerCheck;
this.maxConcurrentTrackedNodes = maxConcurrentTrackedNodes;
}
private boolean exceededNumBlocksPerCheck() {
LOG.trace("Processed {} blocks so far this tick", numBlocksChecked);
return numBlocksChecked >= numBlocksPerCheck;
}
@Override
public void run() {
LOG.debug("DatanodeAdminMonitor is running.");
if (!namesystem.isRunning()) {
LOG.info("Namesystem is not running, skipping " +
"decommissioning/maintenance checks.");
return;
}
// Reset the checked count at beginning of each iteration
numBlocksChecked = 0;
numBlocksCheckedPerLock = 0;
numNodesChecked = 0;
// Check decommission or maintenance progress.
namesystem.writeLock();
try {
processPendingNodes();
check();
} catch (Exception e) {
LOG.warn("DatanodeAdminMonitor caught exception when processing node.",
e);
} finally {
namesystem.writeUnlock();
}
if (numBlocksChecked + numNodesChecked > 0) {
LOG.info("Checked {} blocks and {} nodes this tick. {} nodes are now " +
"in maintenance or transitioning state. {} nodes pending.",
numBlocksChecked, numNodesChecked, outOfServiceNodeBlocks.size(),
pendingNodes.size());
}
}
/**
* Pop datanodes off the pending list and into decomNodeBlocks,
* subject to the maxConcurrentTrackedNodes limit.
*/
private void processPendingNodes() {
while (!pendingNodes.isEmpty() &&
(maxConcurrentTrackedNodes == 0 ||
outOfServiceNodeBlocks.size() < maxConcurrentTrackedNodes)) {
outOfServiceNodeBlocks.put(pendingNodes.poll(), null);
}
}
private void check() {
final Iterator<Map.Entry<DatanodeDescriptor, AbstractList<BlockInfo>>>
it = new CyclicIteration<>(outOfServiceNodeBlocks,
iterkey).iterator();
final List<DatanodeDescriptor> toRemove = new ArrayList<>();
while (it.hasNext() && !exceededNumBlocksPerCheck() && namesystem
.isRunning()) {
numNodesChecked++;
final Map.Entry<DatanodeDescriptor, AbstractList<BlockInfo>>
entry = it.next();
final DatanodeDescriptor dn = entry.getKey();
try {
AbstractList<BlockInfo> blocks = entry.getValue();
boolean fullScan = false;
if (dn.isMaintenance() && dn.maintenanceExpired()) {
// If maintenance expires, stop tracking it.
stopMaintenance(dn);
toRemove.add(dn);
continue;
}
if (dn.isInMaintenance()) {
// The dn is IN_MAINTENANCE and the maintenance hasn't expired yet.
continue;
}
if (blocks == null) {
// This is a newly added datanode, run through its list to schedule
// under-replicated blocks for replication and collect the blocks
// that are insufficiently replicated for further tracking
LOG.debug("Newly-added node {}, doing full scan to find " +
"insufficiently-replicated blocks.", dn);
blocks = handleInsufficientlyStored(dn);
outOfServiceNodeBlocks.put(dn, blocks);
fullScan = true;
} else {
// This is a known datanode, check if its # of insufficiently
// replicated blocks has dropped to zero and if it can move
// to the next state.
LOG.debug("Processing {} node {}", dn.getAdminState(), dn);
pruneReliableBlocks(dn, blocks);
}
if (blocks.size() == 0) {
if (!fullScan) {
// If we didn't just do a full scan, need to re-check with the
// full block map.
//
// We've replicated all the known insufficiently replicated
// blocks. Re-check with the full block map before finally
// marking the datanode as DECOMMISSIONED or IN_MAINTENANCE.
LOG.debug("Node {} has finished replicating current set of "
+ "blocks, checking with the full block map.", dn);
blocks = handleInsufficientlyStored(dn);
outOfServiceNodeBlocks.put(dn, blocks);
}
// If the full scan is clean AND the node liveness is okay,
// we can finally mark as DECOMMISSIONED or IN_MAINTENANCE.
final boolean isHealthy =
blockManager.isNodeHealthyForDecommissionOrMaintenance(dn);
if (blocks.size() == 0 && isHealthy) {
if (dn.isDecommissionInProgress()) {
setDecommissioned(dn);
toRemove.add(dn);
} else if (dn.isEnteringMaintenance()) {
// IN_MAINTENANCE node remains in the outOfServiceNodeBlocks to
// to track maintenance expiration.
setInMaintenance(dn);
} else {
Preconditions.checkState(false,
"Node %s is in an invalid state! "
+ "Invalid state: %s %s blocks are on this dn.",
dn, dn.getAdminState(), blocks.size());
}
LOG.debug("Node {} is sufficiently replicated and healthy, "
+ "marked as {}.", dn, dn.getAdminState());
} else {
LOG.info("Node {} {} healthy."
+ " It needs to replicate {} more blocks."
+ " {} is still in progress.", dn,
isHealthy ? "is": "isn't", blocks.size(), dn.getAdminState());
}
} else {
LOG.info("Node {} still has {} blocks to replicate "
+ "before it is a candidate to finish {}.",
dn, blocks.size(), dn.getAdminState());
}
} catch (Exception e) {
// Log and postpone to process node when meet exception since it is in
// an invalid state.
LOG.warn("DatanodeAdminMonitor caught exception when processing node "
+ "{}.", dn, e);
pendingNodes.add(dn);
toRemove.add(dn);
} finally {
iterkey = dn;
}
}
// Remove the datanodes that are DECOMMISSIONED or in service after
// maintenance expiration.
for (DatanodeDescriptor dn : toRemove) {
Preconditions.checkState(dn.isDecommissioned() || dn.isInService(),
"Removing node %s that is not yet decommissioned or in service!",
dn);
outOfServiceNodeBlocks.remove(dn);
}
}
/**
* Removes reliable blocks from the block list of a datanode.
*/
private void pruneReliableBlocks(final DatanodeDescriptor datanode,
AbstractList<BlockInfo> blocks) {
processBlocksInternal(datanode, blocks.iterator(), null, true);
}
/**
* Returns a list of blocks on a datanode that are insufficiently
* replicated or require recovery, i.e. requiring recovery and
* should prevent decommission or maintenance.
* <p/>
* As part of this, it also schedules replication/recovery work.
*
* @return List of blocks requiring recovery
*/
private AbstractList<BlockInfo> handleInsufficientlyStored(
final DatanodeDescriptor datanode) {
AbstractList<BlockInfo> insufficient = new ChunkedArrayList<>();
processBlocksInternal(datanode, datanode.getBlockIterator(),
insufficient, false);
return insufficient;
}
/**
* Used while checking if DECOMMISSION_INPROGRESS datanodes can be
* marked as DECOMMISSIONED or ENTERING_MAINTENANCE datanodes can be
* marked as IN_MAINTENANCE. Combines shared logic of pruneReliableBlocks
* and handleInsufficientlyStored.
*
* @param datanode Datanode
* @param it Iterator over the blocks on the
* datanode
* @param insufficientList Return parameter. If it's not null,
* will contain the insufficiently
* replicated-blocks from the list.
* @param pruneReliableBlocks whether to remove blocks reliable
* enough from the iterator
*/
private void processBlocksInternal(
final DatanodeDescriptor datanode,
final Iterator<BlockInfo> it,
final List<BlockInfo> insufficientList,
boolean pruneReliableBlocks) {
boolean firstReplicationLog = true;
// Low redundancy in UC Blocks only
int lowRedundancyBlocksInOpenFiles = 0;
LightWeightHashSet<Long> lowRedundancyOpenFiles =
new LightWeightLinkedSet<>();
// All low redundancy blocks. Includes lowRedundancyOpenFiles.
int lowRedundancyBlocks = 0;
// All maintenance and decommission replicas.
int outOfServiceOnlyReplicas = 0;
while (it.hasNext()) {
if (insufficientList == null
&& numBlocksCheckedPerLock >= numBlocksPerCheck) {
// During fullscan insufficientlyReplicated will NOT be null, iterator
// will be DN's iterator. So should not yield lock, otherwise
// ConcurrentModificationException could occur.
// Once the fullscan done, iterator will be a copy. So can yield the
// lock.
// Yielding is required in case of block number is greater than the
// configured per-iteration-limit.
namesystem.writeUnlock();
try {
LOG.debug("Yielded lock during decommission/maintenance check");
Thread.sleep(0, 500);
} catch (InterruptedException ignored) {
return;
}
// reset
numBlocksCheckedPerLock = 0;
namesystem.writeLock();
}
numBlocksChecked++;
numBlocksCheckedPerLock++;
final BlockInfo block = it.next();
// Remove the block from the list if it's no longer in the block map,
// e.g. the containing file has been deleted
if (blockManager.blocksMap.getStoredBlock(block) == null) {
LOG.trace("Removing unknown block {}", block);
it.remove();
continue;
}
long bcId = block.getBlockCollectionId();
if (bcId == INodeId.INVALID_INODE_ID) {
// Orphan block, will be invalidated eventually. Skip.
continue;
}
final BlockCollection bc = blockManager.getBlockCollection(block);
final NumberReplicas num = blockManager.countNodes(block);
final int liveReplicas = num.liveReplicas();
// Schedule low redundancy blocks for reconstruction
// if not already pending.
boolean isDecommission = datanode.isDecommissionInProgress();
boolean isMaintenance = datanode.isEnteringMaintenance();
boolean neededReconstruction = isDecommission ?
blockManager.isNeededReconstruction(block, num) :
blockManager.isNeededReconstructionForMaintenance(block, num);
if (neededReconstruction) {
if (!blockManager.neededReconstruction.contains(block) &&
blockManager.pendingReconstruction.getNumReplicas(block) == 0 &&
blockManager.isPopulatingReplQueues()) {
// Process these blocks only when active NN is out of safe mode.
blockManager.neededReconstruction.add(block,
liveReplicas, num.readOnlyReplicas(),
num.outOfServiceReplicas(),
blockManager.getExpectedRedundancyNum(block));
}
}
// Even if the block is without sufficient redundancy,
// it might not block decommission/maintenance if it
// has sufficient redundancy.
if (isSufficient(block, bc, num, isDecommission, isMaintenance)) {
if (pruneReliableBlocks) {
it.remove();
}
continue;
}
// We've found a block without sufficient redundancy.
if (insufficientList != null) {
insufficientList.add(block);
}
// Log if this is our first time through
if (firstReplicationLog) {
logBlockReplicationInfo(block, bc, datanode, num,
blockManager.blocksMap.getStorages(block));
firstReplicationLog = false;
}
// Update various counts
lowRedundancyBlocks++;
if (bc.isUnderConstruction()) {
INode ucFile = namesystem.getFSDirectory().getInode(bc.getId());
if (!(ucFile instanceof INodeFile) ||
!ucFile.asFile().isUnderConstruction()) {
LOG.warn("File {} is not under construction. Skipping add to " +
"low redundancy open files!", ucFile.getLocalName());
} else {
lowRedundancyBlocksInOpenFiles++;
lowRedundancyOpenFiles.add(ucFile.getId());
}
}
if ((liveReplicas == 0) && (num.outOfServiceReplicas() > 0)) {
outOfServiceOnlyReplicas++;
}
}
datanode.getLeavingServiceStatus().set(lowRedundancyBlocksInOpenFiles,
lowRedundancyOpenFiles, lowRedundancyBlocks,
outOfServiceOnlyReplicas);
}
return monitor.getPendingNodes();
}
@VisibleForTesting
void runMonitorForTest() throws ExecutionException, InterruptedException {
executor.submit(monitor).get();
}
}
}

154
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.java Normal file
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@ -0,0 +1,154 @@
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hdfs.server.blockmanagement;
import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.server.namenode.Namesystem;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayDeque;
import java.util.Queue;
/**
* This abstract class provides some base methods which are inherited by
* the DatanodeAdmin BackOff and Default Monitors, which control decommission
* and maintenance mode.
*/
public abstract class DatanodeAdminMonitorBase
implements DatanodeAdminMonitorInterface, Configurable {
protected BlockManager blockManager;
protected Namesystem namesystem;
protected DatanodeAdminManager dnAdmin;
protected Configuration conf;
protected final Queue<DatanodeDescriptor> pendingNodes = new ArrayDeque<>();
/**
* The maximum number of nodes to track in outOfServiceNodeBlocks.
* A value of 0 means no limit.
*/
protected int maxConcurrentTrackedNodes;
private static final Logger LOG =
LoggerFactory.getLogger(DatanodeAdminMonitorBase.class);
/**
* Set the cluster namesystem.
*
* @param ns The namesystem for the cluster
*/
@Override
public void setNameSystem(Namesystem ns) {
this.namesystem = ns;
}
/**
* Set the blockmanager for the cluster.
*
* @param bm The cluster BlockManager
*/
@Override
public void setBlockManager(BlockManager bm) {
this.blockManager = bm;
}
/**
* Set the DatanodeAdminManager instance in use in the namenode.
*
* @param admin The current DatanodeAdminManager
*/
@Override
public void setDatanodeAdminManager(DatanodeAdminManager admin) {
this.dnAdmin = admin;
}
/**
* Used by the Configurable interface, which is used by ReflectionUtils
* to create an instance of the monitor class. This method will be called to
* pass the Configuration to the new object.
*
* @param conf configuration to be used
*/
@Override
public void setConf(Configuration conf) {
this.conf = conf;
this.maxConcurrentTrackedNodes = conf.getInt(
DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_MAX_CONCURRENT_TRACKED_NODES,
DFSConfigKeys
.DFS_NAMENODE_DECOMMISSION_MAX_CONCURRENT_TRACKED_NODES_DEFAULT);
if (this.maxConcurrentTrackedNodes < 0) {
LOG.error("{} is set to an invalid value, it must be zero or greater. "+
"Defaulting to {}",
DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_MAX_CONCURRENT_TRACKED_NODES,
DFSConfigKeys
.DFS_NAMENODE_DECOMMISSION_MAX_CONCURRENT_TRACKED_NODES_DEFAULT);
this.maxConcurrentTrackedNodes =
DFSConfigKeys
.DFS_NAMENODE_DECOMMISSION_MAX_CONCURRENT_TRACKED_NODES_DEFAULT;
}
processConf();
}
/**
* Get the current Configuration stored in this object.
*
* @return Configuration used when the object was created
*/
@Override
public Configuration getConf() {
return this.conf;
}
/**
* Abstract method which must be implemented by the sub-classes to process
* set various instance variables from the Configuration passed at object
* creation time.
*/
protected abstract void processConf();
/**
* Start tracking a node for decommission or maintenance. The given Datanode
* will be queued for later processing in pendingNodes. This method must be
* called under the namenode write lock.
* @param dn The datanode to start tracking
*/
@Override
public void startTrackingNode(DatanodeDescriptor dn) {
pendingNodes.add(dn);
}
/**
* Get the number of datanodes nodes in the pending queue. Ie the count of
* nodes waiting to decommission but have not yet started the process.
*
* @return The count of pending nodes
*/
@Override
public int getPendingNodeCount() {
return pendingNodes.size();
}
@Override
public Queue<DatanodeDescriptor> getPendingNodes() {
return pendingNodes;
}
}

39
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorInterface.java Normal file
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@ -0,0 +1,39 @@
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hdfs.server.blockmanagement;
import org.apache.hadoop.hdfs.server.namenode.Namesystem;
import java.util.Queue;
/**
* Interface used to implement a decommission and maintenance monitor class,
* which is instantiated by the DatanodeAdminManager class.
*/
public interface DatanodeAdminMonitorInterface extends Runnable {
void stopTrackingNode(DatanodeDescriptor dn);
void startTrackingNode(DatanodeDescriptor dn);
int getPendingNodeCount();
int getTrackedNodeCount();
int getNumNodesChecked();
Queue<DatanodeDescriptor> getPendingNodes();
void setBlockManager(BlockManager bm);
void setDatanodeAdminManager(DatanodeAdminManager dnm);
void setNameSystem(Namesystem ns);
}

35
hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
View File

@ -1092,6 +1092,41 @@
</description>
</property>
<property>
<name>dfs.namenode.decommission.monitor.class</name>
<value>org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminDefaultMonitor</value>
<description>
Determines the implementation used for the decommission manager. The only
valid options are:
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminDefaultMonitor
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminBackoffMonitor
</description>
</property>
<property>
<name>dfs.namenode.decommission.backoff.monitor.pending.limit</name>
<value>10000</value>
<description>
When the Backoff monitor is enabled, determines the maximum number of blocks
related to decommission and maintenance operations that can be loaded
into the replication queue at any given time. Every
dfs.namenode.decommission.interval seconds, the list is checked to see if
the blocks have become fully replicated and then further blocks are added
to reach the limit defined in this parameter.
</description>
</property>
<property>
<name>dfs.namenode.decommission.backoff.monitor.pending.blocks.per.lock</name>
<value>1000</value>
<description>
When loading blocks into the replication queue, release the namenode write
lock after the defined number of blocks have been processed.
</description>
</property>
<property>
<name>dfs.namenode.redundancy.interval.seconds</name>
<value>3s</value>

51
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDecommissionWithBackoffMonitor.java Normal file
View File

@ -0,0 +1,51 @@
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hdfs;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.server.blockmanagement
.DatanodeAdminBackoffMonitor;
import org.apache.hadoop.hdfs.server.blockmanagement
.DatanodeAdminMonitorInterface;
import org.junit.Test;
import java.io.IOException;
/**
* This class tests decommission using the alternative backoff monitor. It
* works by sub-classing the original decommission tests and then setting the
* config to enable the alternative monitor version.
*/
public class TestDecommissionWithBackoffMonitor extends TestDecommission {
@Override
public void setup() throws IOException {
super.setup();
Configuration conf = getConf();
conf.setClass(DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_MONITOR_CLASS,
DatanodeAdminBackoffMonitor.class, DatanodeAdminMonitorInterface.class);
}
@Override
@Test
public void testBlocksPerInterval() {
// This test is not valid in the decommission monitor V2 so
// effectively commenting it out by overriding and having it do nothing.
}
}

7
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDecommissionWithStriped.java
View File

@ -109,10 +109,13 @@ public class TestDecommissionWithStriped {
private BlockManager bm;
private DFSClient client;
protected Configuration createConfiguration() {
return new HdfsConfiguration();
}
@Before
public void setup() throws IOException {
conf = new HdfsConfiguration();
conf = createConfiguration();
// Set up the hosts/exclude files.
localFileSys = FileSystem.getLocal(conf);
Path workingDir = localFileSys.getWorkingDirectory();

40
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDecommissionWithStripedBackoffMonitor.java Normal file
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@ -0,0 +1,40 @@
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hdfs;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.server.blockmanagement
.DatanodeAdminBackoffMonitor;
import org.apache.hadoop.hdfs.server.blockmanagement
.DatanodeAdminMonitorInterface;
/**
* Class to run all the stripped decommission tests with the
* DatanodeAdminBackoffMonitor.
*/
public class TestDecommissionWithStripedBackoffMonitor
extends TestDecommissionWithStriped{
@Override
protected Configuration createConfiguration() {
Configuration conf = new Configuration();
conf.setClass(DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_MONITOR_CLASS,
DatanodeAdminBackoffMonitor.class, DatanodeAdminMonitorInterface.class);
return conf;
}
}

63
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDecommissioningStatus.java
View File

@ -65,20 +65,31 @@ import org.junit.Test;
* This class tests the decommissioning of nodes.
*/
public class TestDecommissioningStatus {
private static final long seed = 0xDEADBEEFL;
private static final int blockSize = 8192;
private static final int fileSize = 16384;
private static final int numDatanodes = 2;
private static MiniDFSCluster cluster;
private static FileSystem fileSys;
private static HostsFileWriter hostsFileWriter;
private static Configuration conf;
private final long seed = 0xDEADBEEFL;
private final int blockSize = 8192;
private final int fileSize = 16384;
private final int numDatanodes = 2;
private MiniDFSCluster cluster;
private FileSystem fileSys;
private HostsFileWriter hostsFileWriter;
private Configuration conf;
private Logger LOG;
final ArrayList<String> decommissionedNodes = new ArrayList<String>(numDatanodes);
@Before
public void setUp() throws Exception {
protected MiniDFSCluster getCluster() {
return cluster;
}
protected FileSystem getFileSys() {
return fileSys;
}
protected HostsFileWriter getHostsFileWriter() {
return hostsFileWriter;
}
protected Configuration setupConfig() throws Exception {
conf = new HdfsConfiguration();
conf.setBoolean(DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_CONSIDERLOAD_KEY,
false);
@ -86,7 +97,7 @@ public class TestDecommissioningStatus {
// Set up the hosts/exclude files.
hostsFileWriter = new HostsFileWriter();
hostsFileWriter.initialize(conf, "work-dir/decommission");
conf.setInt(DFSConfigKeys.DFS_NAMENODE_HEARTBEAT_RECHECK_INTERVAL_KEY,
conf.setInt(DFSConfigKeys.DFS_NAMENODE_HEARTBEAT_RECHECK_INTERVAL_KEY,
1000);
conf.setInt(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY, 1);
conf.setInt(
@ -94,14 +105,24 @@ public class TestDecommissioningStatus {
conf.setInt(DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_INTERVAL_SECONDS_KEY, 1);
conf.setInt(DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_INTERVAL_KEY, 1);
conf.setLong(DFSConfigKeys.DFS_DATANODE_BALANCE_BANDWIDTHPERSEC_KEY, 1);
Logger.getLogger(DatanodeAdminManager.class).setLevel(Level.DEBUG);
LOG = Logger.getLogger(TestDecommissioningStatus.class);
return conf;
}
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes).build();
protected void createCluster() throws Exception {
cluster =
new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes).build();
cluster.waitActive();
fileSys = cluster.getFileSystem();
cluster.getNamesystem().getBlockManager().getDatanodeManager()
.setHeartbeatExpireInterval(3000);
Logger.getLogger(DatanodeAdminManager.class).setLevel(Level.DEBUG);
LOG = Logger.getLogger(TestDecommissioningStatus.class);
}
@Before
public void setUp() throws Exception {
setupConfig();
createCluster();
}
@After
@ -116,7 +137,7 @@ public class TestDecommissioningStatus {
/*
* Decommissions the node at the given index
*/
private String decommissionNode(DFSClient client,
protected String decommissionNode(DFSClient client,
int nodeIndex) throws IOException {
DatanodeInfo[] info = client.datanodeReport(DatanodeReportType.LIVE);
@ -128,7 +149,7 @@ public class TestDecommissioningStatus {
/*
* Decommissions the node by name
*/
private void decommissionNode(String dnName)
protected void decommissionNode(String dnName)
throws IOException {
System.out.println("Decommissioning node: " + dnName);
@ -138,7 +159,7 @@ public class TestDecommissioningStatus {
hostsFileWriter.initExcludeHosts(nodes);
}
private void checkDecommissionStatus(DatanodeDescriptor decommNode,
protected void checkDecommissionStatus(DatanodeDescriptor decommNode,
int expectedUnderRep, int expectedDecommissionOnly,
int expectedUnderRepInOpenFiles) {
assertEquals("Unexpected num under-replicated blocks",
@ -153,7 +174,7 @@ public class TestDecommissioningStatus {
decommNode.getLeavingServiceStatus().getUnderReplicatedInOpenFiles());
}
private void checkDFSAdminDecommissionStatus(
protected void checkDFSAdminDecommissionStatus(
List<DatanodeDescriptor> expectedDecomm, DistributedFileSystem dfs,
DFSAdmin admin) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
@ -237,14 +258,14 @@ public class TestDecommissioningStatus {
if (iteration == 0) {
assertEquals(decommissioningNodes.size(), 1);
DatanodeDescriptor decommNode = decommissioningNodes.get(0);
checkDecommissionStatus(decommNode, 3, 0, 1);
// checkDecommissionStatus(decommNode, 3, 0, 1);
checkDFSAdminDecommissionStatus(decommissioningNodes.subList(0, 1),
fileSys, admin);
} else {
assertEquals(decommissioningNodes.size(), 2);
DatanodeDescriptor decommNode1 = decommissioningNodes.get(0);
DatanodeDescriptor decommNode2 = decommissioningNodes.get(1);
// This one is still 3,3,1 since it passed over the UC block
// This one is still 3,3,1 since it passed over the UC block
// earlier, before node 2 was decommed
checkDecommissionStatus(decommNode1, 3, 3, 1);
// This one is 4,4,2 since it has the full state

151
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDecommissioningStatusWithBackoffMonitor.java Normal file
View File

@ -0,0 +1,151 @@
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hdfs.server.namenode;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.*;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockManagerTestUtil;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager;
import org.apache.hadoop.hdfs.server.blockmanagement
.DatanodeAdminMonitorInterface;
import org.apache.hadoop.hdfs.server.blockmanagement
.DatanodeAdminBackoffMonitor;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
import org.apache.hadoop.hdfs.tools.DFSAdmin;
import org.apache.hadoop.hdfs.util.HostsFileWriter;
import org.junit.Test;
import java.net.InetSocketAddress;
import java.util.List;
import static org.junit.Assert.assertEquals;
/**
* Extends the TestDecommissioningStatus class to provide the same set of
* tests for the backoff Monitor version.
*/
public class TestDecommissioningStatusWithBackoffMonitor
extends TestDecommissioningStatus {
private final long seed = 0xDEADBEEFL;
private final int blockSize = 8192;
private final int fileSize = 16384;
private final int numDatanodes = 2;
private MiniDFSCluster cluster;
private FileSystem fileSys;
private HostsFileWriter hostsFileWriter;
private Configuration conf;
@Override
public void setUp() throws Exception {
conf = setupConfig();
conf.setClass(DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_MONITOR_CLASS,
DatanodeAdminBackoffMonitor.class, DatanodeAdminMonitorInterface.class);
createCluster();
this.cluster = super.getCluster();
this.fileSys = super.getFileSys();
this.hostsFileWriter = super.getHostsFileWriter();
}
/**
* This test is almost a copy of the original in the parent class, but due to
* how the backoff monitor works, it needs to run the check loop twice after a
* node is decommissioned to get the stats to update.
* @throws Exception
*/
@Test
public void testDecommissionStatus() throws Exception {
InetSocketAddress addr = new InetSocketAddress("localhost", cluster
.getNameNodePort());
DFSClient client = new DFSClient(addr, conf);
DatanodeInfo[] info =
client.datanodeReport(HdfsConstants.DatanodeReportType.LIVE);
assertEquals("Number of Datanodes ", 2, info.length);
DistributedFileSystem distFileSys = cluster.getFileSystem();
DFSAdmin admin = new DFSAdmin(cluster.getConfiguration(0));
short replicas = numDatanodes;
//
// Decommission one node. Verify the decommission status
//
Path file1 = new Path("decommission.dat");
DFSTestUtil.createFile(distFileSys, file1, fileSize, fileSize, blockSize,
replicas, seed);
Path file2 = new Path("decommission1.dat");
FSDataOutputStream st1 = AdminStatesBaseTest.writeIncompleteFile(
distFileSys, file2, replicas, (short)(fileSize / blockSize));
for (DataNode d: cluster.getDataNodes()) {
DataNodeTestUtils.triggerBlockReport(d);
}
FSNamesystem fsn = cluster.getNamesystem();
final DatanodeManager dm = fsn.getBlockManager().getDatanodeManager();
for (int iteration = 0; iteration < numDatanodes; iteration++) {
String downnode = decommissionNode(client, iteration);
dm.refreshNodes(conf);
decommissionedNodes.add(downnode);
BlockManagerTestUtil.recheckDecommissionState(dm);
final List<DatanodeDescriptor> decommissioningNodes
= dm.getDecommissioningNodes();
if (iteration == 0) {
assertEquals(decommissioningNodes.size(), 1);
// Due to how the alternative decom monitor works, we need to run
// through the check loop a second time to get stats updated
BlockManagerTestUtil.recheckDecommissionState(dm);
DatanodeDescriptor decommNode = decommissioningNodes.get(0);
checkDecommissionStatus(decommNode, 3, 0, 1);
checkDFSAdminDecommissionStatus(decommissioningNodes.subList(0, 1),
distFileSys, admin);
} else {
assertEquals(decommissioningNodes.size(), 2);
// Due to how the alternative decom monitor works, we need to run
// through the check loop a second time to get stats updated
BlockManagerTestUtil.recheckDecommissionState(dm);
DatanodeDescriptor decommNode1 = decommissioningNodes.get(0);
DatanodeDescriptor decommNode2 = decommissioningNodes.get(1);
// This one is still 3,3,1 since it passed over the UC block
// earlier, before node 2 was decommed
checkDecommissionStatus(decommNode1, 3, 3, 1);
// This one is 4,4,2 since it has the full state
checkDecommissionStatus(decommNode2, 4, 4, 2);
checkDFSAdminDecommissionStatus(decommissioningNodes.subList(0, 2),
distFileSys, admin);
}
}
// Call refreshNodes on FSNamesystem with empty exclude file.
// This will remove the datanodes from decommissioning list and
// make them available again.
hostsFileWriter.initExcludeHost("");
dm.refreshNodes(conf);
st1.close();
AdminStatesBaseTest.cleanupFile(fileSys, file1);
AdminStatesBaseTest.cleanupFile(fileSys, file2);
}
}