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From "Brandon Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5657) race condition causes writeback state error in NFS gateway
Date Thu, 12 Dec 2013 21:57:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13846790#comment-13846790
] 

Brandon Li commented on HDFS-5657:
----------------------------------

Uploaded a new patch. The basic idea is to make sure there is "asyncStatus = false" is only
set in final clause and with the object lock acquired.

> race condition causes writeback state error in NFS gateway
> ----------------------------------------------------------
>
>                 Key: HDFS-5657
>                 URL: https://issues.apache.org/jira/browse/HDFS-5657
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: nfs
>            Reporter: Brandon Li
>            Assignee: Brandon Li
>         Attachments: HDFS-5657.001.patch, HDFS-5657.002.patch
>
>
> A race condition between NFS gateway writeback executor thread and new write handler
thread can cause writeback state check failure, e.g.,
> {noformat}
> 2013-11-26 10:34:07,859 DEBUG nfs3.RpcProgramNfs3 (Nfs3Utils.java:writeChannel(113))
- WRITE_RPC_CALL_END______957880843
> 2013-11-26 10:34:07,863 DEBUG nfs3.OpenFileCtx (OpenFileCtx.java:offerNextToWrite(832))
- The asyn write task has no pending writes, fileId: 30938
> 2013-11-26 10:34:07,871 ERROR nfs3.AsyncDataService (AsyncDataService.java:run(136))
- Asyn data service got error:java.lang.IllegalStateException: The openFileCtx has false async
status
>         at com.google.common.base.Preconditions.checkState(Preconditions.java:145)
>         at org.apache.hadoop.hdfs.nfs.nfs3.OpenFileCtx.executeWriteBack(OpenFileCtx.java:890)
>         at org.apache.hadoop.hdfs.nfs.nfs3.AsyncDataService$WriteBackTask.run(AsyncDataService.java:134)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:662)
> 2013-11-26 10:34:07,901 DEBUG nfs3.RpcProgramNfs3 (RpcProgramNfs3.java:write(707)) -
requesed offset=917504 and current filesize=917504
> 2013-11-26 10:34:07,902 DEBUG nfs3.WriteManager (WriteManager.java:handleWrite(131))
- handleWrite fileId: 30938 offset: 917504 length:65536 stableHow:0
> {noformat}



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