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https://issues.apache.org/jira/browse/HDFS-13953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16637221#comment-16637221
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Brahma Reddy Battula commented on HDFS-13953:
---------------------------------------------
is it related to HDFS-10714? NPE is because fault storages and it's addressed
in HDFS-12299.?
> Failure of last datanode in the pipeline results in block recovery failure
> and subsequent NPE during fsck
> ---------------------------------------------------------------------------------------------------------
>
> Key: HDFS-13953
> URL: https://issues.apache.org/jira/browse/HDFS-13953
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.6.0
> Reporter: Hrishikesh Gadre
> Priority: Major
>
> A user reported following scenario,
> * HBase region server created WAL and attempted to write
> * As part of the pipeline write, following events happened,
> ** The last data node in the pipeline failed.
> ** The region server could not identify this last data node as the root
> cause of write failure and instead reported NN the first data node in the
> pipeline as the cause of failure.
> ** NN created a new write pipeline by replacing the good data node and
> retaining the faulty data node.
> ** This process continued for three iterations until NN encountered an NPE.
> * Now the fsck on the /bhase directory also failing due to NPE in NN
> Following stack traces was found in region server logs
> {noformat}
> WARN org.apache.hadoop.hdfs.DFSClient: DataStreamer Exception
> org.apache.hadoop.ipc.RemoteException(java.lang.NullPointerException):
> java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.removeStaleReplicas(BlockManager.java:3238)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.updateLastBlock(BlockManager.java:3633)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.updatePipelineInternal(FSNamesystem.java:7374)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.updatePipeline(FSNamesystem.java:7339)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.updatePipeline(NameNodeRpcServer.java:777)
> at
> org.apache.hadoop.hdfs.server.namenode.AuthorizationProviderProxyClientProtocol.updatePipeline(AuthorizationProviderProxyClientProtocol.java:654){noformat}
>
> AND
>
> {noformat}
> WARN org.apache.hadoop.hbase.util.FSHDFSUtils: attempt=0 on
> file=hdfs://nameservice1/hbase/genie/WALs/ABC,60020,1525325654855-splitting/abc%2C60020%2C1525325654855.null0.1536002440010
> after 6ms
> org.apache.hadoop.ipc.RemoteException(java.lang.NullPointerException):
> java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoUnderConstruction$ReplicaUnderConstruction.isAlive(BlockInfoUnderConstruction.java:121)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoUnderConstruction.initializeBlockRecovery(BlockInfoUnderConstruction.java:288)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.internalReleaseLease(FSNamesystem.java:4846)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.recoverLeaseInternal(FSNamesystem.java:3252)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.recoverLease(FSNamesystem.java:3196)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.recoverLease(NameNodeRpcServer.java:630)
> at
> org.apache.hadoop.hdfs.server.namenode.AuthorizationProviderProxyClientProtocol.recoverLease(AuthorizationProviderProxyClientProtocol.java:372)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.recoverLease(ClientNamenodeProtocolServerSideTranslatorPB.java:681)
> at
> org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$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){noformat}
>
>
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