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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-529) RegionServer needs to recover if datanode goes down
Date Tue, 18 Mar 2008 21:39:24 GMT

    [ https://issues.apache.org/jira/browse/HBASE-529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12580108#action_12580108
] 

stack commented on HBASE-529:
-----------------------------

+1

> RegionServer needs to recover if datanode goes down
> ---------------------------------------------------
>
>                 Key: HBASE-529
>                 URL: https://issues.apache.org/jira/browse/HBASE-529
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.2.0
>            Reporter: Bryan Duxbury
>            Assignee: Bryan Duxbury
>            Priority: Blocker
>             Fix For: 0.2.0
>
>         Attachments: 529.patch
>
>
> If I take down a datanode, the regionserver will repeatedly return this error:
> java.io.IOException: Stream closed.
>         at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.isClosed(DFSClient.java:1875)
>         at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.writeChunk(DFSClient.java:2096)
>         at org.apache.hadoop.fs.FSOutputSummer.writeChecksumChunk(FSOutputSummer.java:141)
>         at org.apache.hadoop.fs.FSOutputSummer.flushBuffer(FSOutputSummer.java:124)
>         at org.apache.hadoop.fs.FSOutputSummer.write1(FSOutputSummer.java:112)
>         at org.apache.hadoop.fs.FSOutputSummer.write(FSOutputSummer.java:86)
>         at org.apache.hadoop.fs.FSDataOutputStream$PositionCache.write(FSDataOutputStream.java:41)
>         at java.io.DataOutputStream.write(Unknown Source)
>         at org.apache.hadoop.io.SequenceFile$Writer.append(SequenceFile.java:977)
>         at org.apache.hadoop.hbase.HLog.append(HLog.java:377)
>         at org.apache.hadoop.hbase.HRegion.update(HRegion.java:1455)
>         at org.apache.hadoop.hbase.HRegion.batchUpdate(HRegion.java:1259)
>         at org.apache.hadoop.hbase.HRegionServer.batchUpdate(HRegionServer.java:1433)
>         at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>         at java.lang.reflect.Method.invoke(Unknown Source)
>         at org.apache.hadoop.hbase.ipc.HbaseRPC$Server.call(HbaseRPC.java:413)
>         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:910)
> It appears that hbase/dfsclient does not attempt to reopen the stream.

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