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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11225) NameNode crashed because deleteSnapshot held FSNamesystem lock too long
Date Fri, 16 Dec 2016 01:41:59 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11225?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Junping Du updated HDFS-11225:
------------------------------
    Target Version/s: 2.9.0, 3.0.0-beta1  (was: 2.8.0, 3.0.0-beta1)

> NameNode crashed because deleteSnapshot held FSNamesystem lock too long
> -----------------------------------------------------------------------
>
>                 Key: HDFS-11225
>                 URL: https://issues.apache.org/jira/browse/HDFS-11225
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.4.0
>         Environment: CDH5.8.2, HA
>            Reporter: Wei-Chiu Chuang
>            Assignee: Manoj Govindassamy
>            Priority: Critical
>              Labels: high-availability
>
> The deleteSnapshot operation is synchronous. In certain situations this operation may
hold FSNamesystem lock for too long, bringing almost every NameNode operation to a halt.
> We have observed one incidence where it took so long that ZKFC believes the NameNode
is down. All other IPC threads were waiting to acquire FSNamesystem lock. This specific deleteSnapshot
took ~70 seconds. ZKFC has connection timeout of 45 seconds by default, and if all IPC threads
wait for FSNamesystem lock and can't accept new incoming connection, ZKFC times out, advances
epoch and NameNode will therefore lose its active NN role and then fail.
> Relevant log:
> {noformat}
> Thread 154 (IPC Server handler 86 on 8020):
>   State: RUNNABLE
>   Blocked count: 2753455
>   Waited count: 89201773
>   Stack:
>     org.apache.hadoop.hdfs.server.namenode.INode$BlocksMapUpdateInfo.addDeleteBlock(INode.java:879)
>     org.apache.hadoop.hdfs.server.namenode.INodeFile.destroyAndCollectBlocks(INodeFile.java:508)
>     org.apache.hadoop.hdfs.server.namenode.INodeDirectory.destroyAndCollectBlocks(INodeDirectory.java:763)
>     org.apache.hadoop.hdfs.server.namenode.INodeDirectory.destroyAndCollectBlocks(INodeDirectory.java:763)
>     org.apache.hadoop.hdfs.server.namenode.INodeDirectory.destroyAndCollectBlocks(INodeDirectory.java:763)
>     org.apache.hadoop.hdfs.server.namenode.INodeDirectory.destroyAndCollectBlocks(INodeDirectory.java:763)
>     org.apache.hadoop.hdfs.server.namenode.INodeReference.destroyAndCollectBlocks(INodeReference.java:339)
>     org.apache.hadoop.hdfs.server.namenode.INodeReference$WithName.destroyAndCollectBlocks(INodeReference.java:606)
>     org.apache.hadoop.hdfs.server.namenode.snapshot.DirectoryWithSnapshotFeature$ChildrenDiff.destroyDeletedList(DirectoryWithSnapshotFeature.java:119)
>     org.apache.hadoop.hdfs.server.namenode.snapshot.DirectoryWithSnapshotFeature$ChildrenDiff.access$400(DirectoryWithSnapshotFeature.java:61)
>     org.apache.hadoop.hdfs.server.namenode.snapshot.DirectoryWithSnapshotFeature$DirectoryDiff.destroyDiffAndCollectBlocks(DirectoryWithSnapshotFeature.java:319)
>     org.apache.hadoop.hdfs.server.namenode.snapshot.DirectoryWithSnapshotFeature$DirectoryDiff.destroyDiffAndCollectBlocks(DirectoryWithSnapshotFeature.java:167)
>     org.apache.hadoop.hdfs.server.namenode.snapshot.AbstractINodeDiffList.deleteSnapshotDiff(AbstractINodeDiffList.java:83)
>     org.apache.hadoop.hdfs.server.namenode.snapshot.DirectoryWithSnapshotFeature.cleanDirectory(DirectoryWithSnapshotFeature.java:745)
>     org.apache.hadoop.hdfs.server.namenode.INodeDirectory.cleanSubtree(INodeDirectory.java:776)
>     org.apache.hadoop.hdfs.server.namenode.INodeDirectory.cleanSubtreeRecursively(INodeDirectory.java:747)
>     org.apache.hadoop.hdfs.server.namenode.snapshot.DirectoryWithSnapshotFeature.cleanDirectory(DirectoryWithSnapshotFeature.java:747)
>     org.apache.hadoop.hdfs.server.namenode.INodeDirectory.cleanSubtree(INodeDirectory.java:776)
>     org.apache.hadoop.hdfs.server.namenode.INodeDirectory.cleanSubtreeRecursively(INodeDirectory.java:747)
>     org.apache.hadoop.hdfs.server.namenode.INodeDirectory.cleanSubtree(INodeDirectory.java:789)
> {noformat}
> After the ZKFC determined NameNode was down and advanced epoch, the NN finished deleting
snapshot, and sent the edit to journal nodes, but it was rejected because epoch was updated.
See the following stacktrace:
> {noformat}
> 10.0.16.21:8485: IPC's epoch 17 is less than the last promised epoch 18
>         at org.apache.hadoop.hdfs.qjournal.server.Journal.checkRequest(Journal.java:429)
>         at org.apache.hadoop.hdfs.qjournal.server.Journal.checkWriteRequest(Journal.java:457)
>         at org.apache.hadoop.hdfs.qjournal.server.Journal.journal(Journal.java:352)
>         at org.apache.hadoop.hdfs.qjournal.server.JournalNodeRpcServer.journal(JournalNodeRpcServer.java:149)
>         at org.apache.hadoop.hdfs.qjournal.protocolPB.QJournalProtocolServerSideTranslatorPB.journal(QJournalProtocolServerSideTranslatorPB.java:158)
>         at org.apache.hadoop.hdfs.qjournal.protocol.QJournalProtocolProtos$QJournalProtocolService$2.callBlockingMethod(QJournalProtocolProtos.java:25421)
>         at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:617)
>         at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1073)
>         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2086)
>         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2082)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:422)
>         at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1693)
>         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2080)
>         at org.apache.hadoop.hdfs.qjournal.client.QuorumException.create(QuorumException.java:81)
>         at org.apache.hadoop.hdfs.qjournal.client.QuorumCall.rethrowException(QuorumCall.java:223)
>         at org.apache.hadoop.hdfs.qjournal.client.AsyncLoggerSet.waitForWriteQuorum(AsyncLoggerSet.java:142)
>         at org.apache.hadoop.hdfs.qjournal.client.QuorumOutputStream.flushAndSync(QuorumOutputStream.java:107)
>         at org.apache.hadoop.hdfs.server.namenode.EditLogOutputStream.flush(EditLogOutputStream.java:113)
>         at org.apache.hadoop.hdfs.server.namenode.EditLogOutputStream.flush(EditLogOutputStream.java:107)
>         at org.apache.hadoop.hdfs.server.namenode.JournalSet$JournalSetOutputStream$8.apply(JournalSet.java:533)
>         at org.apache.hadoop.hdfs.server.namenode.JournalSet.mapJournalsAndReportErrors(JournalSet.java:393)
>         at org.apache.hadoop.hdfs.server.namenode.JournalSet.access$100(JournalSet.java:57)
>         at org.apache.hadoop.hdfs.server.namenode.JournalSet$JournalSetOutputStream.flush(JournalSet.java:529)
>         at org.apache.hadoop.hdfs.server.namenode.FSEditLog.logSync(FSEditLog.java:641)
>         at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.deleteSnapshot(FSNamesystem.java:8507)
>         at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.deleteSnapshot(NameNodeRpcServer.java:1469)
>         at org.apache.hadoop.hdfs.server.namenode.AuthorizationProviderProxyClientProtocol.deleteSnapshot(AuthorizationProviderProxyClientProtocol.java:717)
>         at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.deleteSnapshot(ClientNamenodeProtocolServerSideTranslatorPB.java:1061)
>         at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
>         at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:617)
>         at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1073)
>         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2086)
>         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2082)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:422)
>         at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1693)
>         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2080)
> {noformat}
> Finally NameNode shut itself down because it had too many quorum errors.
> Setting priority to critical because it resulted in NameNode crash.
> We think deleteSnapshot should be made asynchronous. It should delete the root of snapshot
directory, and then put the rest of work into an asynchronous thread. Credit: [~yzhangal]
for proposing this idea.



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