HDFS-16064. Determine when to invalidate corrupt replicas based on number of usable replicas (#4410)
Co-authored-by: Kevin Wikant <wikak@amazon.com> Signed-off-by: Akira Ajisaka <aajisaka@apache.org>
This commit is contained in:
KevinWikant
GitHub
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cfceaebde6
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@ -1916,23 +1916,29 @@ public class BlockManager implements BlockStatsMXBean {
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b.getReasonCode(), b.getStored().isStriped());
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NumberReplicas numberOfReplicas = countNodes(b.getStored());
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boolean hasEnoughLiveReplicas = numberOfReplicas.liveReplicas() >=
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final int numUsableReplicas = numberOfReplicas.liveReplicas() +
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numberOfReplicas.decommissioning() +
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numberOfReplicas.liveEnteringMaintenanceReplicas();
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boolean hasEnoughLiveReplicas = numUsableReplicas >=
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expectedRedundancies;
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boolean minReplicationSatisfied = hasMinStorage(b.getStored(),
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numberOfReplicas.liveReplicas());
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numUsableReplicas);
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boolean hasMoreCorruptReplicas = minReplicationSatisfied &&
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(numberOfReplicas.liveReplicas() + numberOfReplicas.corruptReplicas()) >
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expectedRedundancies;
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boolean corruptedDuringWrite = minReplicationSatisfied &&
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b.isCorruptedDuringWrite();
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// case 1: have enough number of live replicas
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// case 2: corrupted replicas + live replicas > Replication factor
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// case 1: have enough number of usable replicas
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// case 2: corrupted replicas + usable replicas > Replication factor
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// case 3: Block is marked corrupt due to failure while writing. In this
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// case genstamp will be different than that of valid block.
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// In all these cases we can delete the replica.
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// In case of 3, rbw block will be deleted and valid block can be replicated
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// In case 3, rbw block will be deleted and valid block can be replicated.
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// Note NN only becomes aware of corrupt blocks when the block report is sent,
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// this means that by default it can take up to 6 hours for a corrupt block to
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// be invalidated, after which the valid block can be replicated.
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if (hasEnoughLiveReplicas || hasMoreCorruptReplicas
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|| corruptedDuringWrite) {
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if (b.getStored().isStriped()) {
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@ -3656,7 +3662,7 @@ public class BlockManager implements BlockStatsMXBean {
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". blockMap has {} but corrupt replicas map has {}",
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storedBlock, numCorruptNodes, corruptReplicasCount);
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}
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if ((corruptReplicasCount > 0) && (numLiveReplicas >= fileRedundancy)) {
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if ((corruptReplicasCount > 0) && (numUsableReplicas >= fileRedundancy)) {
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invalidateCorruptReplicas(storedBlock, reportedBlock, num);
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}
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return storedBlock;
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@ -52,6 +52,7 @@ import org.apache.hadoop.fs.FSDataOutputStream;
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import org.apache.hadoop.fs.FileSystem;
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import org.apache.hadoop.fs.Path;
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import org.apache.hadoop.fs.BatchedRemoteIterator.BatchedEntries;
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import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
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import org.apache.hadoop.hdfs.client.HdfsDataInputStream;
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import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;
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import org.apache.hadoop.hdfs.protocol.Block;
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@ -1902,4 +1903,285 @@ public class TestDecommission extends AdminStatesBaseTest {
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!BlockManagerTestUtil.isNodeHealthyForDecommissionOrMaintenance(blockManager, node)
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&& !node.isAlive()), 500, 20000);
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}
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/*
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This test reproduces a scenario where an under-replicated block on a decommissioning node
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cannot be replicated to some datanodes because they have a corrupt replica of the block.
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The test ensures that the corrupt replicas are eventually invalidated so that the
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under-replicated block can be replicated to sufficient datanodes & the decommissioning
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node can be decommissioned.
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*/
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@Test(timeout = 60000)
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public void testDeleteCorruptReplicaForUnderReplicatedBlock() throws Exception {
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// Constants
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final Path file = new Path("/test-file");
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final int numDatanode = 3;
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final short replicationFactor = 2;
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final int numStoppedNodes = 2;
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final int numDecommNodes = 1;
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assertEquals(numDatanode, numStoppedNodes + numDecommNodes);
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// Run monitor every 5 seconds to speed up decommissioning & make the test faster
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final int datanodeAdminMonitorFixedRateSeconds = 5;
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getConf().setInt(MiniDFSCluster.DFS_NAMENODE_DECOMMISSION_INTERVAL_TESTING_KEY,
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datanodeAdminMonitorFixedRateSeconds);
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// Set block report interval to 6 hours to avoid unexpected block reports.
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// The default block report interval is different for a MiniDFSCluster
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getConf().setLong(DFSConfigKeys.DFS_BLOCKREPORT_INTERVAL_MSEC_KEY,
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DFSConfigKeys.DFS_BLOCKREPORT_INTERVAL_MSEC_DEFAULT);
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// Run the BlockManager RedundancyMonitor every 3 seconds such that the Namenode
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// sends under-replication blocks for replication frequently
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getConf().setLong(DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_INTERVAL_SECONDS_KEY,
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DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_INTERVAL_SECONDS_DEFAULT);
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// Ensure that the DataStreamer client will replace the bad datanode on append failure
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getConf().set(HdfsClientConfigKeys.BlockWrite.ReplaceDatanodeOnFailure.POLICY_KEY, "ALWAYS");
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// Avoid having the DataStreamer client fail the append operation if datanode replacement fails
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getConf()
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.setBoolean(HdfsClientConfigKeys.BlockWrite.ReplaceDatanodeOnFailure.BEST_EFFORT_KEY, true);
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// References to datanodes in the cluster
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// - 2 datanode will be stopped to generate corrupt block replicas & then
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// restarted later to validate the corrupt replicas are invalidated
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// - 1 datanode will start decommissioning to make the block under replicated
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final List<DatanodeDescriptor> allNodes = new ArrayList<>();
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final List<DatanodeDescriptor> stoppedNodes = new ArrayList<>();
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final DatanodeDescriptor decommNode;
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// Create MiniDFSCluster
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startCluster(1, numDatanode);
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getCluster().waitActive();
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final FSNamesystem namesystem = getCluster().getNamesystem();
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final BlockManager blockManager = namesystem.getBlockManager();
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final DatanodeManager datanodeManager = blockManager.getDatanodeManager();
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final DatanodeAdminManager decomManager = datanodeManager.getDatanodeAdminManager();
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final FileSystem fs = getCluster().getFileSystem();
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// Get DatanodeDescriptors
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for (final DataNode node : getCluster().getDataNodes()) {
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allNodes.add(getDatanodeDesriptor(namesystem, node.getDatanodeUuid()));
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}
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// Create block with 2 FINALIZED replicas
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// Note that:
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// - calling hflush leaves block in state ReplicaBeingWritten
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// - calling close leaves the block in state FINALIZED
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// - amount of data is kept small because flush is not synchronous
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LOG.info("Creating Initial Block with {} FINALIZED replicas", replicationFactor);
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FSDataOutputStream out = fs.create(file, replicationFactor);
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for (int i = 0; i < 512; i++) {
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out.write(i);
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}
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out.close();
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// Validate the block exists with expected number of replicas
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assertEquals(1, blockManager.getTotalBlocks());
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BlockLocation[] blocksInFile = fs.getFileBlockLocations(file, 0, 0);
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assertEquals(1, blocksInFile.length);
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List<String> replicasInBlock = Arrays.asList(blocksInFile[0].getNames());
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assertEquals(replicationFactor, replicasInBlock.size());
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// Identify the DatanodeDescriptors associated with the 2 nodes with replicas.
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// Each of nodes with a replica will be stopped later to corrupt the replica
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DatanodeDescriptor decommNodeTmp = null;
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for (DatanodeDescriptor node : allNodes) {
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if (replicasInBlock.contains(node.getName())) {
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stoppedNodes.add(node);
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} else {
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decommNodeTmp = node;
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}
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}
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assertEquals(numStoppedNodes, stoppedNodes.size());
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assertNotNull(decommNodeTmp);
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decommNode = decommNodeTmp;
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final DatanodeDescriptor firstStoppedNode = stoppedNodes.get(0);
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final DatanodeDescriptor secondStoppedNode = stoppedNodes.get(1);
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LOG.info("Detected 2 nodes with replicas : {} , {}", firstStoppedNode.getXferAddr(),
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secondStoppedNode.getXferAddr());
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LOG.info("Detected 1 node without replica : {}", decommNode.getXferAddr());
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// Stop firstStoppedNode & the append to the block pipeline such that DataStreamer client:
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// - detects firstStoppedNode as bad link in block pipeline
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// - replaces the firstStoppedNode with decommNode in block pipeline
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// The result is that:
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// - secondStoppedNode & decommNode have a live block replica
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// - firstStoppedNode has a corrupt replica (corrupt because of old GenStamp)
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LOG.info("Stopping first node with replica {}", firstStoppedNode.getXferAddr());
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final List<MiniDFSCluster.DataNodeProperties> stoppedNodeProps = new ArrayList<>();
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MiniDFSCluster.DataNodeProperties stoppedNodeProp =
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getCluster().stopDataNode(firstStoppedNode.getXferAddr());
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stoppedNodeProps.add(stoppedNodeProp);
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firstStoppedNode.setLastUpdate(213); // Set last heartbeat to be in the past
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// Wait for NN to detect the datanode as dead
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GenericTestUtils.waitFor(
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() -> 2 == datanodeManager.getNumLiveDataNodes() && 1 == datanodeManager
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.getNumDeadDataNodes(), 500, 30000);
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// Append to block pipeline
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appendBlock(fs, file, 2);
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// Stop secondStoppedNode & the append to the block pipeline such that DataStreamer client:
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// - detects secondStoppedNode as bad link in block pipeline
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// - attempts to replace secondStoppedNode but cannot because there are no more live nodes
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// - appends to the block pipeline containing just decommNode
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// The result is that:
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// - decommNode has a live block replica
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// - firstStoppedNode & secondStoppedNode both have a corrupt replica
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LOG.info("Stopping second node with replica {}", secondStoppedNode.getXferAddr());
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stoppedNodeProp = getCluster().stopDataNode(secondStoppedNode.getXferAddr());
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stoppedNodeProps.add(stoppedNodeProp);
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secondStoppedNode.setLastUpdate(213); // Set last heartbeat to be in the past
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// Wait for NN to detect the datanode as dead
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GenericTestUtils.waitFor(() -> numDecommNodes == datanodeManager.getNumLiveDataNodes()
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&& numStoppedNodes == datanodeManager.getNumDeadDataNodes(), 500, 30000);
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// Append to block pipeline
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appendBlock(fs, file, 1);
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// Validate block replica locations
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blocksInFile = fs.getFileBlockLocations(file, 0, 0);
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assertEquals(1, blocksInFile.length);
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replicasInBlock = Arrays.asList(blocksInFile[0].getNames());
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assertEquals(numDecommNodes, replicasInBlock.size());
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assertTrue(replicasInBlock.contains(decommNode.getName()));
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LOG.info("Block now has 2 corrupt replicas on [{} , {}] and 1 live replica on {}",
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firstStoppedNode.getXferAddr(), secondStoppedNode.getXferAddr(), decommNode.getXferAddr());
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LOG.info("Decommission node {} with the live replica", decommNode.getXferAddr());
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final ArrayList<DatanodeInfo> decommissionedNodes = new ArrayList<>();
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takeNodeOutofService(0, decommNode.getDatanodeUuid(), 0, decommissionedNodes,
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AdminStates.DECOMMISSION_INPROGRESS);
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// Wait for the datanode to start decommissioning
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try {
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GenericTestUtils.waitFor(() -> decomManager.getNumTrackedNodes() == 0
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&& decomManager.getNumPendingNodes() == numDecommNodes && decommNode.getAdminState()
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.equals(AdminStates.DECOMMISSION_INPROGRESS), 500, 30000);
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} catch (Exception e) {
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blocksInFile = fs.getFileBlockLocations(file, 0, 0);
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assertEquals(1, blocksInFile.length);
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replicasInBlock = Arrays.asList(blocksInFile[0].getNames());
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String errMsg = String.format("Node %s failed to start decommissioning."
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+ " numTrackedNodes=%d , numPendingNodes=%d , adminState=%s , nodesWithReplica=[%s]",
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decommNode.getXferAddr(), decomManager.getNumTrackedNodes(),
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decomManager.getNumPendingNodes(), decommNode.getAdminState(),
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String.join(", ", replicasInBlock));
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LOG.error(errMsg); // Do not log generic timeout exception
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fail(errMsg);
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}
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// Validate block replica locations
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blocksInFile = fs.getFileBlockLocations(file, 0, 0);
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assertEquals(1, blocksInFile.length);
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replicasInBlock = Arrays.asList(blocksInFile[0].getNames());
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assertEquals(numDecommNodes, replicasInBlock.size());
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assertEquals(replicasInBlock.get(0), decommNode.getName());
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LOG.info("Block now has 2 corrupt replicas on [{} , {}] and 1 decommissioning replica on {}",
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firstStoppedNode.getXferAddr(), secondStoppedNode.getXferAddr(), decommNode.getXferAddr());
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// Restart the 2 stopped datanodes
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LOG.info("Restarting stopped nodes {} , {}", firstStoppedNode.getXferAddr(),
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secondStoppedNode.getXferAddr());
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for (final MiniDFSCluster.DataNodeProperties stoppedNode : stoppedNodeProps) {
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assertTrue(getCluster().restartDataNode(stoppedNode));
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}
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for (final MiniDFSCluster.DataNodeProperties stoppedNode : stoppedNodeProps) {
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try {
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getCluster().waitDatanodeFullyStarted(stoppedNode.getDatanode(), 30000);
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LOG.info("Node {} Restarted", stoppedNode.getDatanode().getXferAddress());
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} catch (Exception e) {
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String errMsg = String.format("Node %s Failed to Restart within 30 seconds",
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stoppedNode.getDatanode().getXferAddress());
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LOG.error(errMsg); // Do not log generic timeout exception
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fail(errMsg);
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}
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}
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// Trigger block reports for the 2 restarted nodes to ensure their corrupt
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// block replicas are identified by the namenode
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for (MiniDFSCluster.DataNodeProperties dnProps : stoppedNodeProps) {
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DataNodeTestUtils.triggerBlockReport(dnProps.getDatanode());
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}
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// Validate the datanode is eventually decommissioned
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// Some changes are needed to ensure replication/decommissioning occur in a timely manner:
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// - if the namenode sends a DNA_TRANSFER before sending the DNA_INVALIDATE's then:
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// - the block will enter the pendingReconstruction queue
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// - this prevent the block from being sent for transfer again for some time
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// - solution is to call "clearQueues" so that DNA_TRANSFER is sent again after DNA_INVALIDATE
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// - need to run the check less frequently than DatanodeAdminMonitor
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// such that in between "clearQueues" calls 2 things can occur:
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// - DatanodeAdminMonitor runs which sets the block as neededReplication
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// - datanode heartbeat is received which sends the DNA_TRANSFER to the node
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final int checkEveryMillis = datanodeAdminMonitorFixedRateSeconds * 2 * 1000;
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try {
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GenericTestUtils.waitFor(() -> {
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blockManager.clearQueues(); // Clear pendingReconstruction queue
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return decomManager.getNumTrackedNodes() == 0 && decomManager.getNumPendingNodes() == 0
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&& decommNode.getAdminState().equals(AdminStates.DECOMMISSIONED);
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}, checkEveryMillis, 40000);
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} catch (Exception e) {
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blocksInFile = fs.getFileBlockLocations(file, 0, 0);
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assertEquals(1, blocksInFile.length);
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replicasInBlock = Arrays.asList(blocksInFile[0].getNames());
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String errMsg = String.format("Node %s failed to complete decommissioning."
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+ " numTrackedNodes=%d , numPendingNodes=%d , adminState=%s , nodesWithReplica=[%s]",
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decommNode.getXferAddr(), decomManager.getNumTrackedNodes(),
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decomManager.getNumPendingNodes(), decommNode.getAdminState(),
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String.join(", ", replicasInBlock));
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LOG.error(errMsg); // Do not log generic timeout exception
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fail(errMsg);
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}
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// Validate block replica locations.
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// Note that in order for decommissioning to complete the block must be
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// replicated to both of the restarted datanodes; this implies that the
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// corrupt replicas were invalidated on both of the restarted datanodes.
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blocksInFile = fs.getFileBlockLocations(file, 0, 0);
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assertEquals(1, blocksInFile.length);
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replicasInBlock = Arrays.asList(blocksInFile[0].getNames());
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assertEquals(numDatanode, replicasInBlock.size());
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assertTrue(replicasInBlock.contains(decommNode.getName()));
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for (final DatanodeDescriptor node : stoppedNodes) {
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assertTrue(replicasInBlock.contains(node.getName()));
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}
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LOG.info("Block now has 2 live replicas on [{} , {}] and 1 decommissioned replica on {}",
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firstStoppedNode.getXferAddr(), secondStoppedNode.getXferAddr(), decommNode.getXferAddr());
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}
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void appendBlock(final FileSystem fs, final Path file, int expectedReplicas) throws IOException {
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LOG.info("Appending to the block pipeline");
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boolean failed = false;
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Exception failedReason = null;
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try {
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FSDataOutputStream out = fs.append(file);
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for (int i = 0; i < 512; i++) {
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out.write(i);
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}
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out.close();
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} catch (Exception e) {
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failed = true;
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failedReason = e;
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} finally {
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BlockLocation[] blocksInFile = fs.getFileBlockLocations(file, 0, 0);
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assertEquals(1, blocksInFile.length);
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List<String> replicasInBlock = Arrays.asList(blocksInFile[0].getNames());
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if (failed) {
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String errMsg = String.format(
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"Unexpected exception appending to the block pipeline."
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+ " nodesWithReplica=[%s]", String.join(", ", replicasInBlock));
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LOG.error(errMsg, failedReason); // Do not swallow the exception
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fail(errMsg);
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} else if (expectedReplicas != replicasInBlock.size()) {
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String errMsg = String.format("Expecting %d replicas in block pipeline,"
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+ " unexpectedly found %d replicas. nodesWithReplica=[%s]", expectedReplicas,
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replicasInBlock.size(), String.join(", ", replicasInBlock));
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LOG.error(errMsg);
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fail(errMsg);
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} else {
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String infoMsg = String.format(
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"Successfully appended block pipeline with %d replicas."
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+ " nodesWithReplica=[%s]",
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replicasInBlock.size(), String.join(", ", replicasInBlock));
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LOG.info(infoMsg);
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}
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}
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}
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}
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