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https://issues.apache.org/jira/browse/HDFS-14429?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yicong Cai updated HDFS-14429:
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Attachment: (was: HDFS-14429.02.patch)
> Block remain in COMMITTED but not COMPLETE cause by Decommission
> ----------------------------------------------------------------
>
> Key: HDFS-14429
> URL: https://issues.apache.org/jira/browse/HDFS-14429
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.9.2
> Reporter: Yicong Cai
> Assignee: Yicong Cai
> Priority: Major
> Attachments: HDFS-14429.01.patch
>
>
> In the following scenario, the Block will remain in the COMMITTED but not
> COMPLETE state and cannot be closed properly:
> # Client writes Block(bk1) to three data nodes (dn1/dn2/dn3).
> # bk1 has been completely written to three data nodes, and the data node
> succeeds FinalizeBlock, joins IBR and waits to report to NameNode.
> # The client commits bk1 after receiving the ACK.
> # When the DN has not been reported to the IBR, all three nodes dn1/dn2/dn3
> enter Decommissioning.
> # The DN reports the IBR, but the block cannot be completed normally.
>
> Then it will lead to the following related exceptions:
> {panel:title=Exception}
> 2019-04-02 13:40:31,882 INFO namenode.FSNamesystem
> (FSNamesystem.java:checkBlocksComplete(2790)) - BLOCK*
> blk_4313483521_3245321090 is COMMITTED but not COMPLETE(numNodes= 3 >=
> minimum = 1) in file xxx
> 2019-04-02 13:40:31,882 INFO ipc.Server (Server.java:logException(2650)) -
> IPC Server handler 499 on 8020, call Call#122552 Retry#0
> org.apache.hadoop.hdfs.protocol.ClientProtocol.addBlock from xxx:47615
> org.apache.hadoop.hdfs.server.namenode.NotReplicatedYetException: Not
> replicated yet: xxx
> at
> org.apache.hadoop.hdfs.server.namenode.FSDirWriteFileOp.validateAddBlock(FSDirWriteFileOp.java:171)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:2579)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:846)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:510)
> at
> org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:503)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:989)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:871)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:817)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1893)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2606)
> {panel}
> And will cause the scenario described in HDFS-12747
> The root cause is that addStoredBlock does not consider the case where the
> replications are in Decommission.
> This problem needs to be fixed like HDFS-11499.
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