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Posted to hdfs-issues@hadoop.apache.org by "Shweta (JIRA)" <ji...@apache.org> on 2018/11/29 18:55:08 UTC
[jira] [Comment Edited] (HDFS-14081) hdfs dfsadmin -metasave
metasave_test results NPE
[ https://issues.apache.org/jira/browse/HDFS-14081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16703649#comment-16703649 ]
Shweta edited comment on HDFS-14081 at 11/29/18 6:54 PM:
---------------------------------------------------------
Thanks for the review [~knanasi]. To keep the logging format consistent with the way other statements are written in the method and to accommodate your suggestion, I have added the escape next line character "\n" to the out.print statement.
Updated with the above change and uploaded patch 3. Please review.
was (Author: shwetayakkali):
Thanks for the review [~knanasi]. To keep the logging format consistent with the way other statements are written in the method and to accommodate your suggestion I have added the escape next line character "\n" to the out.print statement.
Updated with the above change and uploaded patch 3. Please review.
> 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
>
>
> 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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