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https://issues.apache.org/jira/browse/HDFS-14081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16750568#comment-16750568
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Wei-Chiu Chuang commented on HDFS-14081:
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Hi [~shwetayakkali] looks like {{TestDFSAdminWithHA#testMetaSave}} failed after
the standby NN throws StandbyException. DFSAdmin errors out if any of the
NameNode throws IOException (StandbyException included). We should update
DFSAdmin to tolerate the StandbyException. But even with the additional change,
old client will not work against newer NameNode.
> hdfs dfsadmin -metasave metasave_test results NPE
> -------------------------------------------------
>
> Key: HDFS-14081
> URL: https://issues.apache.org/jira/browse/HDFS-14081
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs
> Affects Versions: 3.2.1
> Reporter: Shweta
> Assignee: Shweta
> Priority: Major
> Attachments: HDFS-14081.001.patch, HDFS-14081.002.patch,
> HDFS-14081.003.patch, HDFS-14081.004.patch, HDFS-14081.005.patch
>
>
> Race condition is encountered while adding Block to
> postponedMisreplicatedBlocks which in turn tried to retrieve Block from
> BlockManager in which it may not be present.
> This happens in HA, metasave in first NN succeeded but failed in second NN,
> StackTrace showing NPE is as follows:
> {code}
> 2018-07-12 21:39:09,783 WARN org.apache.hadoop.ipc.Server: IPC Server handler
> 24 on 8020, call Call#1 Retry#0
> org.apache.hadoop.hdfs.protocol.ClientProtocol.metaSave from
> 172.26.9.163:602342018-07-12 21:39:09,783 WARN org.apache.hadoop.ipc.Server:
> IPC Server handler 24 on 8020, call Call#1 Retry#0
> org.apache.hadoop.hdfs.protocol.ClientProtocol.metaSave from
> 172.26.9.163:60234java.lang.NullPointerException at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseSourceDatanodes(BlockManager.java:2175)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.dumpBlockMeta(BlockManager.java:830)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.metaSave(BlockManager.java:762)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.metaSave(FSNamesystem.java:1782)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.metaSave(FSNamesystem.java:1766)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.metaSave(NameNodeRpcServer.java:1320)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.metaSave(ClientNamenodeProtocolServerSideTranslatorPB.java:928)
> at
> org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:523)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:991) at
> org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:869) at
> org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:815) 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:1685)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2675) {code}
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