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HDFS-6995. Block should be placed in the client's 'rack-local' node if 'client-local' node is not available (vinayakumarb)

This commit is contained in:
Vinayakumar B 2014-10-06 14:31:15 +05:30
parent 16333b4fd8
commit ed841dd9a9
6 changed files with 68 additions and 19 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -1054,6 +1054,9 @@ Release 2.6.0 - UNRELEASED
HDFS-7131. During HA upgrade, JournalNode should create a new committedTxnId
file in the current directory. (jing9)
HDFS-6995. Block should be placed in the client's 'rack-local' node
if 'client-local' node is not available (vinayakumarb)
BREAKDOWN OF HDFS-6584 ARCHIVAL STORAGE
HDFS-6677. Change INodeFile and FSImage to support storage policy ID.

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
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@ -1493,7 +1493,7 @@ public class BlockManager {
/** Choose target for getting additional datanodes for an existing pipeline. */
public DatanodeStorageInfo[] chooseTarget4AdditionalDatanode(String src,
int numAdditionalNodes,
DatanodeDescriptor clientnode,
Node clientnode,
List<DatanodeStorageInfo> chosen,
Set<Node> excludes,
long blocksize,
@ -1513,7 +1513,7 @@ public class BlockManager {
* Set, long, List, BlockStoragePolicy)
*/
public DatanodeStorageInfo[] chooseTarget4NewBlock(final String src,
final int numOfReplicas, final DatanodeDescriptor client,
final int numOfReplicas, final Node client,
final Set<Node> excludedNodes,
final long blocksize,
final List<String> favoredNodes,

12
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java
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@ -205,10 +205,6 @@ public class BlockPlacementPolicyDefault extends BlockPlacementPolicy {
addToExcludedNodes(storage.getDatanodeDescriptor(), excludedNodes);
}
if (!clusterMap.contains(writer)) {
writer = null;
}
boolean avoidStaleNodes = (stats != null
&& stats.isAvoidingStaleDataNodesForWrite());
final Node localNode = chooseTarget(numOfReplicas, writer, excludedNodes,
@ -219,8 +215,10 @@ public class BlockPlacementPolicyDefault extends BlockPlacementPolicy {
}
// sorting nodes to form a pipeline
return getPipeline((writer==null)?localNode:writer,
results.toArray(new DatanodeStorageInfo[results.size()]));
return getPipeline(
(writer != null && writer instanceof DatanodeDescriptor) ? writer
: localNode,
results.toArray(new DatanodeStorageInfo[results.size()]));
}
private int[] getMaxNodesPerRack(int numOfChosen, int numOfReplicas) {
@ -271,7 +269,7 @@ public class BlockPlacementPolicyDefault extends BlockPlacementPolicy {
final EnumSet<StorageType> unavailableStorages,
final boolean newBlock) {
if (numOfReplicas == 0 || clusterMap.getNumOfLeaves()==0) {
return writer;
return (writer instanceof DatanodeDescriptor) ? writer : null;
}
final int numOfResults = results.size();
final int totalReplicasExpected = numOfReplicas + numOfResults;

15
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
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@ -691,8 +691,7 @@ public class DatanodeManager {
names.add(node.getHostName());
}
// resolve its network location
List<String> rName = dnsToSwitchMapping.resolve(names);
List<String> rName = resolveNetworkLocation(names);
String networkLocation;
if (rName == null) {
LOG.error("The resolve call returned null!");
@ -704,6 +703,18 @@ public class DatanodeManager {
return networkLocation;
}
/**
* Resolve network locations for specified hosts
*
* @param names
* @return Network locations if available, Else returns null
*/
public List<String> resolveNetworkLocation(List<String> names) {
// resolve its network location
List<String> rName = dnsToSwitchMapping.resolve(names);
return rName;
}
/**
* Resolve a node's dependencies in the network. If the DNS to switch
* mapping fails then this method returns empty list of dependencies

40
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -266,6 +266,7 @@ import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
import org.apache.hadoop.metrics2.util.MBeans;
import org.apache.hadoop.net.NetworkTopology;
import org.apache.hadoop.net.Node;
import org.apache.hadoop.net.NodeBase;
import org.apache.hadoop.security.AccessControlException;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.UserGroupInformation.AuthenticationMethod;
@ -3122,7 +3123,8 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
final long blockSize;
final int replication;
final byte storagePolicyID;
DatanodeDescriptor clientNode = null;
Node clientNode = null;
String clientMachine = null;
if(NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("BLOCK* NameSystem.getAdditionalBlock: "
@ -3153,14 +3155,20 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
+ maxBlocksPerFile);
}
blockSize = pendingFile.getPreferredBlockSize();
clientMachine = pendingFile.getFileUnderConstructionFeature()
.getClientMachine();
clientNode = blockManager.getDatanodeManager().getDatanodeByHost(
pendingFile.getFileUnderConstructionFeature().getClientMachine());
clientMachine);
replication = pendingFile.getFileReplication();
storagePolicyID = pendingFile.getStoragePolicyID();
} finally {
readUnlock();
}
if (clientNode == null) {
clientNode = getClientNode(clientMachine);
}
// choose targets for the new block to be allocated.
final DatanodeStorageInfo targets[] = getBlockManager().chooseTarget4NewBlock(
src, replication, clientNode, excludedNodes, blockSize, favoredNodes,
@ -3217,6 +3225,24 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
return makeLocatedBlock(newBlock, targets, offset);
}
/*
* Resolve clientmachine address to get a network location path
*/
private Node getClientNode(String clientMachine) {
List<String> hosts = new ArrayList<String>(1);
hosts.add(clientMachine);
List<String> rName = getBlockManager().getDatanodeManager()
.resolveNetworkLocation(hosts);
Node clientNode = null;
if (rName != null) {
// Able to resolve clientMachine mapping.
// Create a temp node to findout the rack local nodes
clientNode = new NodeBase(rName.get(0) + NodeBase.PATH_SEPARATOR_STR
+ clientMachine);
}
return clientNode;
}
static class FileState {
public final INodeFile inode;
public final String path;
@ -3350,7 +3376,8 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
//check if the feature is enabled
dtpReplaceDatanodeOnFailure.checkEnabled();
final DatanodeDescriptor clientnode;
Node clientnode = null;
String clientMachine;
final long preferredblocksize;
final byte storagePolicyID;
final List<DatanodeStorageInfo> chosen;
@ -3375,8 +3402,7 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
if (inode != null) src = inode.getFullPathName();
}
final INodeFile file = checkLease(src, clientName, inode, fileId);
String clientMachine = file.getFileUnderConstructionFeature()
.getClientMachine();
clientMachine = file.getFileUnderConstructionFeature().getClientMachine();
clientnode = blockManager.getDatanodeManager().getDatanodeByHost(clientMachine);
preferredblocksize = file.getPreferredBlockSize();
storagePolicyID = file.getStoragePolicyID();
@ -3388,6 +3414,10 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
readUnlock();
}
if (clientnode == null) {
clientnode = getClientNode(clientMachine);
}
// choose new datanodes.
final DatanodeStorageInfo[] targets = blockManager.chooseTarget4AdditionalDatanode(
src, numAdditionalNodes, clientnode, chosen,

11
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestReplicationPolicyConsiderLoad.java
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@ -34,7 +34,6 @@ import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.TestBlockStoragePolicy;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.security.token.block.ExportedBlockKeys;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.NodeType;
@ -142,10 +141,18 @@ public class TestReplicationPolicyConsiderLoad {
}
assertEquals((double)load/3, fsn.getInServiceXceiverAverage(), EPSILON);
// update references of writer DN to update the de-commissioned state
List<DatanodeDescriptor> liveNodes = new ArrayList<DatanodeDescriptor>();
dnManager.fetchDatanodes(liveNodes, null, false);
DatanodeDescriptor writerDn = null;
if (liveNodes.contains(dataNodes[0])) {
writerDn = liveNodes.get(liveNodes.indexOf(dataNodes[0]));
}
// Call chooseTarget()
DatanodeStorageInfo[] targets = namenode.getNamesystem().getBlockManager()
.getBlockPlacementPolicy().chooseTarget("testFile.txt", 3,
dataNodes[0], new ArrayList<DatanodeStorageInfo>(), false, null,
writerDn, new ArrayList<DatanodeStorageInfo>(), false, null,
1024, TestBlockStoragePolicy.DEFAULT_STORAGE_POLICY);
assertEquals(3, targets.length);