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From "Dave Latham (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4107) OOME while writing WAL checksum causes corrupt WAL
Date Fri, 26 Aug 2011 16:42:29 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4107?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dave Latham updated HBASE-4107:
-------------------------------

    Attachment: master.splitting.log
                regionserver.oom.log

We recently hit the same issue.  I am able to download the corrupt WAL log file through the
HDFS web interface, but cannot post it publicly.

> OOME while writing WAL checksum causes corrupt WAL
> --------------------------------------------------
>
>                 Key: HBASE-4107
>                 URL: https://issues.apache.org/jira/browse/HBASE-4107
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver, wal
>    Affects Versions: 0.90.1
>         Environment: CentOS 5.5x64
>            Reporter: Andy Sautins
>         Attachments: master.splitting.log, regionserver.oom.log
>
>
> An issue was observed where upon shutdown of a regionserver the regionserver log was
corrupt.  It appears from the following stacktrace that an Java heap memory exception occurred
while writing the checksum to the WAL.  Corrupting the WAL can potentially cause data loss.

> 2011-07-14 14:54:53,741 FATAL org.apache.hadoop.hbase.regionserver.wal.HLog: Could not
append. Requesting close of hlog
> java.io.IOException: Reflection
>         at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter.sync(SequenceFileLogWriter.java:147)
>         at org.apache.hadoop.hbase.regionserver.wal.HLog.sync(HLog.java:987)
>         at org.apache.hadoop.hbase.regionserver.wal.HLog$LogSyncer.run(HLog.java:964)
> Caused by: java.lang.reflect.InvocationTargetException
>         at sun.reflect.GeneratedMethodAccessor1336.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter.sync(SequenceFileLogWriter.java:145)
>         ... 2 more
> Caused by: java.lang.OutOfMemoryError: Java heap space
>         at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$Packet.<init>(DFSClient.java:2375)
>         at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.writeChunk(DFSClient.java:3271)
>         at org.apache.hadoop.fs.FSOutputSummer.writeChecksumChunk(FSOutputSummer.java:150)
>         at org.apache.hadoop.fs.FSOutputSummer.flushBuffer(FSOutputSummer.java:132)
>         at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.sync(DFSClient.java:3354)
>         at org.apache.hadoop.fs.FSDataOutputStream.sync(FSDataOutputStream.java:97)
>         at org.apache.hadoop.io.SequenceFile$Writer.syncFs(SequenceFile.java:944)
>         ... 6 more

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