Hrishikesh Gadre created HDFS-13953:
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Summary: 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
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/hbasedn193.pv08.siri.apple.com,60020,1525325654855-splitting/hbasedn193.pv08.siri.apple.com%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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