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Date: Mon, 10 Dec 2007 13:16:43 -0800 (PST)
From: "stack (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Updated: (HADOOP-2283) [hbase] AlreadyBeingCreatedException
 (Was: Stuck replay of failed regionserver edits)
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     [ https://issues.apache.org/jira/browse/HADOOP-2283?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HADOOP-2283:
--------------------------

    Attachment: 2283.patch

> [hbase] AlreadyBeingCreatedException (Was: Stuck replay of failed regionserver edits)
> -------------------------------------------------------------------------------------
>
>                 Key: HADOOP-2283
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2283
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/hbase
>            Reporter: stack
>            Assignee: stack
>            Priority: Minor
>             Fix For: 0.16.0
>
>         Attachments: 2283.patch, 2283.patch, compaction.patch, OP_READ.patch
>
>
> Looking in master for a cluster of ~90 regionservers, the regionserver carrying the ROOT went down (because it hadn't talked to the master in 30 seconds).
> Master notices the downed regionserver because its lease timesout. It then goes to run the shutdown server sequence only splitting the regionserver's edit log, it gets stuck trying to split the second of three log files. Eventually, after ~5minutes, the second log split throws:
> 34974 2007-11-26 01:21:23,999 WARN  hbase.HMaster - Processing pending operations: ProcessServerShutdown of XX.XX.XX.XX:60020
>   34975 org.apache.hadoop.dfs.AlreadyBeingCreatedException: org.apache.hadoop.dfs.AlreadyBeingCreatedException: failed to create file /hbase/hregion_-1194436719/oldlogfile.log for DFSClient_610028837 on client XX.XX.XX.XX because curren        t leaseholder is trying to recreate file.
>   34976     at org.apache.hadoop.dfs.FSNamesystem.startFileInternal(FSNamesystem.java:848)
>   34977     at org.apache.hadoop.dfs.FSNamesystem.startFile(FSNamesystem.java:804)
>   34978     at org.apache.hadoop.dfs.NameNode.create(NameNode.java:276)
>   34979     at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source)
>   34980     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>   34981     at java.lang.reflect.Method.invoke(Method.java:597)
>   34982     at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:379)
>   34983     at org.apache.hadoop.ipc.Server$Handler.run(Server.java:596)
>   34984 
>   34985     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
>   34986     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
>   34987     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
>   34988     at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
>   34989     at org.apache.hadoop.hbase.RemoteExceptionHandler.decodeRemoteException(RemoteExceptionHandler.java:82)
>   34990     at org.apache.hadoop.hbase.HMaster.run(HMaster.java:1094)
> And so on every 5 minutes.
> Because the regionserver that went down had ROOT region, and because we are stuck in this eternal loop, ROOT never gets reallocated.

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