HDFS-12703. Exceptions are fatal to decommissioning monitor. Contributed by He Xiaoqiao.
This commit is contained in:
Inigo Goiri
parent
cdb20adfcc
commit
eccc9a40de
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@ -484,6 +484,7 @@ public class DatanodeAdminManager {
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@Override
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public void run() {
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LOG.debug("DatanodeAdminMonitor is running.");
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if (!namesystem.isRunning()) {
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LOG.info("Namesystem is not running, skipping " +
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"decommissioning/maintenance checks.");
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@ -498,6 +499,9 @@ public class DatanodeAdminManager {
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try {
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processPendingNodes();
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check();
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} catch (Exception e) {
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LOG.warn("DatanodeAdminMonitor caught exception when processing node.",
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e);
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} finally {
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namesystem.writeUnlock();
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}
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@ -531,83 +535,96 @@ public class DatanodeAdminManager {
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final Map.Entry<DatanodeDescriptor, AbstractList<BlockInfo>>
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entry = it.next();
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final DatanodeDescriptor dn = entry.getKey();
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AbstractList<BlockInfo> blocks = entry.getValue();
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boolean fullScan = false;
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if (dn.isMaintenance() && dn.maintenanceExpired()) {
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// If maintenance expires, stop tracking it.
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stopMaintenance(dn);
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toRemove.add(dn);
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continue;
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}
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if (dn.isInMaintenance()) {
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// The dn is IN_MAINTENANCE and the maintenance hasn't expired yet.
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continue;
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}
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if (blocks == null) {
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// This is a newly added datanode, run through its list to schedule
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// under-replicated blocks for replication and collect the blocks
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// that are insufficiently replicated for further tracking
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LOG.debug("Newly-added node {}, doing full scan to find " +
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"insufficiently-replicated blocks.", dn);
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blocks = handleInsufficientlyStored(dn);
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outOfServiceNodeBlocks.put(dn, blocks);
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fullScan = true;
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} else {
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// This is a known datanode, check if its # of insufficiently
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// replicated blocks has dropped to zero and if it can move
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// to the next state.
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LOG.debug("Processing {} node {}", dn.getAdminState(), dn);
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pruneReliableBlocks(dn, blocks);
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}
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if (blocks.size() == 0) {
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if (!fullScan) {
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// If we didn't just do a full scan, need to re-check with the
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// full block map.
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//
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// We've replicated all the known insufficiently replicated
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// blocks. Re-check with the full block map before finally
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// marking the datanode as DECOMMISSIONED or IN_MAINTENANCE.
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LOG.debug("Node {} has finished replicating current set of "
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+ "blocks, checking with the full block map.", dn);
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try {
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AbstractList<BlockInfo> blocks = entry.getValue();
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boolean fullScan = false;
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if (dn.isMaintenance() && dn.maintenanceExpired()) {
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// If maintenance expires, stop tracking it.
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stopMaintenance(dn);
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toRemove.add(dn);
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continue;
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}
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if (dn.isInMaintenance()) {
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// The dn is IN_MAINTENANCE and the maintenance hasn't expired yet.
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continue;
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}
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if (blocks == null) {
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// This is a newly added datanode, run through its list to schedule
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// under-replicated blocks for replication and collect the blocks
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// that are insufficiently replicated for further tracking
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LOG.debug("Newly-added node {}, doing full scan to find " +
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"insufficiently-replicated blocks.", dn);
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blocks = handleInsufficientlyStored(dn);
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outOfServiceNodeBlocks.put(dn, blocks);
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}
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// If the full scan is clean AND the node liveness is okay,
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// we can finally mark as DECOMMISSIONED or IN_MAINTENANCE.
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final boolean isHealthy =
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blockManager.isNodeHealthyForDecommissionOrMaintenance(dn);
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if (blocks.size() == 0 && isHealthy) {
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if (dn.isDecommissionInProgress()) {
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setDecommissioned(dn);
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toRemove.add(dn);
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} else if (dn.isEnteringMaintenance()) {
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// IN_MAINTENANCE node remains in the outOfServiceNodeBlocks to
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// to track maintenance expiration.
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setInMaintenance(dn);
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} else {
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Preconditions.checkState(false,
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"A node is in an invalid state!");
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}
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LOG.debug("Node {} is sufficiently replicated and healthy, "
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+ "marked as {}.", dn, dn.getAdminState());
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fullScan = true;
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} else {
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LOG.debug("Node {} {} healthy."
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+ " It needs to replicate {} more blocks."
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+ " {} is still in progress.", dn,
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isHealthy ? "is": "isn't", blocks.size(), dn.getAdminState());
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// This is a known datanode, check if its # of insufficiently
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// replicated blocks has dropped to zero and if it can move
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// to the next state.
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LOG.debug("Processing {} node {}", dn.getAdminState(), dn);
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pruneReliableBlocks(dn, blocks);
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}
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} else {
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LOG.debug("Node {} still has {} blocks to replicate "
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+ "before it is a candidate to finish {}.",
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dn, blocks.size(), dn.getAdminState());
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if (blocks.size() == 0) {
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if (!fullScan) {
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// If we didn't just do a full scan, need to re-check with the
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// full block map.
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//
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// We've replicated all the known insufficiently replicated
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// blocks. Re-check with the full block map before finally
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// marking the datanode as DECOMMISSIONED or IN_MAINTENANCE.
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LOG.debug("Node {} has finished replicating current set of "
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+ "blocks, checking with the full block map.", dn);
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blocks = handleInsufficientlyStored(dn);
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outOfServiceNodeBlocks.put(dn, blocks);
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}
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// If the full scan is clean AND the node liveness is okay,
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// we can finally mark as DECOMMISSIONED or IN_MAINTENANCE.
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final boolean isHealthy =
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blockManager.isNodeHealthyForDecommissionOrMaintenance(dn);
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if (blocks.size() == 0 && isHealthy) {
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if (dn.isDecommissionInProgress()) {
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setDecommissioned(dn);
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toRemove.add(dn);
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} else if (dn.isEnteringMaintenance()) {
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// IN_MAINTENANCE node remains in the outOfServiceNodeBlocks to
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// to track maintenance expiration.
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setInMaintenance(dn);
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} else {
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Preconditions.checkState(false,
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"Node %s is in an invalid state! "
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+ "Invalid state: %s %s blocks are on this dn.",
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dn, dn.getAdminState(), blocks.size());
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}
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LOG.debug("Node {} is sufficiently replicated and healthy, "
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+ "marked as {}.", dn, dn.getAdminState());
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} else {
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LOG.debug("Node {} {} healthy."
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+ " It needs to replicate {} more blocks."
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+ " {} is still in progress.", dn,
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isHealthy ? "is": "isn't", blocks.size(), dn.getAdminState());
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}
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} else {
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LOG.debug("Node {} still has {} blocks to replicate "
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+ "before it is a candidate to finish {}.",
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dn, blocks.size(), dn.getAdminState());
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}
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} catch (Exception e) {
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// Log and postpone to process node when meet exception since it is in
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// an invalid state.
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LOG.warn("DatanodeAdminMonitor caught exception when processing node "
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+ "{}.", dn, e);
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pendingNodes.add(dn);
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toRemove.add(dn);
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} finally {
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iterkey = dn;
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}
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iterkey = dn;
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}
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// Remove the datanodes that are DECOMMISSIONED or in service after
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// maintenance expiration.
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for (DatanodeDescriptor dn : toRemove) {
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Preconditions.checkState(dn.isDecommissioned() || dn.isInService(),
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"Removing a node that is not yet decommissioned or in service!");
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"Removing node %s that is not yet decommissioned or in service!",
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dn);
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outOfServiceNodeBlocks.remove(dn);
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}
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}
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@ -21,6 +21,7 @@ import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertNotNull;
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import static org.junit.Assert.assertNull;
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import static org.junit.Assert.assertTrue;
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import static org.junit.Assert.fail;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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@ -35,6 +36,7 @@ import java.util.Map;
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import java.util.Scanner;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.regex.Pattern;
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import com.google.common.base.Supplier;
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import com.google.common.collect.Lists;
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@ -1181,6 +1183,56 @@ public class TestDecommission extends AdminStatesBaseTest {
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}
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}
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/**
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* Test DatanodeAdminManager#monitor can swallow any exceptions by default.
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*/
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@Test(timeout=120000)
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public void testPendingNodeButDecommissioned() throws Exception {
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// Only allow one node to be decom'd at a time
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getConf().setInt(
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DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_MAX_CONCURRENT_TRACKED_NODES,
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1);
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// Disable the normal monitor runs
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getConf().setInt(DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_INTERVAL_KEY,
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Integer.MAX_VALUE);
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startCluster(1, 2);
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final DatanodeManager datanodeManager =
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getCluster().getNamesystem().getBlockManager().getDatanodeManager();
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final DatanodeAdminManager decomManager =
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datanodeManager.getDatanodeAdminManager();
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ArrayList<DatanodeInfo> decommissionedNodes = Lists.newArrayList();
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List<DataNode> dns = getCluster().getDataNodes();
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// Try to decommission 2 datanodes
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for (int i = 0; i < 2; i++) {
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DataNode d = dns.get(i);
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DatanodeInfo dn = takeNodeOutofService(0, d.getDatanodeUuid(), 0,
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decommissionedNodes, AdminStates.DECOMMISSION_INPROGRESS);
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decommissionedNodes.add(dn);
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}
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assertEquals(2, decomManager.getNumPendingNodes());
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// Set one datanode state to Decommissioned after decommission ops.
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DatanodeDescriptor dn = datanodeManager.getDatanode(dns.get(0)
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.getDatanodeId());
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dn.setDecommissioned();
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try {
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// Trigger DatanodeAdminManager#monitor
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BlockManagerTestUtil.recheckDecommissionState(datanodeManager);
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// Wait for OutOfServiceNodeBlocks to be 0
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GenericTestUtils.waitFor(() -> decomManager.getNumTrackedNodes() == 0,
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500, 30000);
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assertTrue(GenericTestUtils.anyThreadMatching(
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Pattern.compile("DatanodeAdminMonitor-.*")));
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} catch (ExecutionException e) {
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GenericTestUtils.assertExceptionContains("in an invalid state!", e);
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fail("DatanodeAdminManager#monitor does not swallow exceptions.");
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}
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}
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@Test(timeout=120000)
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public void testPendingNodes() throws Exception {
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org.apache.log4j.Logger.getLogger(DatanodeAdminManager.class)
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