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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2933) Always Skip Errors during Log Recovery
Date Wed, 25 Aug 2010 20:17:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12902612#action_12902612

Todd Lipcon commented on HBASE-2933:

Yep - even with good working master failover, you might lose power on the cluster, in which
case all the masters would die. We'd have a "clean startup" but to not lose data we have to
split *all* the logs (woo!)

> Always Skip Errors during Log Recovery
> --------------------------------------
>                 Key: HBASE-2933
>                 URL: https://issues.apache.org/jira/browse/HBASE-2933
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Nicolas Spiegelberg
>            Assignee: Nicolas Spiegelberg
> While testing a cluster, we hit upon the following assert during region assigment.  We
were killing the master during a long run of splits.  We think what happened is that the HMaster
was killed while splitting, woke up & split again.  If this happens, we will have 2 files:
1 partially written and 1 complete one.  Since encountering partial log splits upon Master
failure is considered normal behavior, we should continue at the RS level if we encounter
an EOFException & not an filesystem-level exception, even with skip.errors == false.
> 2010-08-20 16:59:07,718 ERROR org.apache.hadoop.hbase.regionserver.HRegionServer: Error
opening MailBox_dsanduleac,57db45276ece7ce03ef7e8d9969eb189:99900000000008@facebook.com,1280960828959.7c542d24d4496e273b739231b01885e6.
> java.io.EOFException
>         at java.io.DataInputStream.readInt(DataInputStream.java:375)
>         at org.apache.hadoop.io.SequenceFile$Reader.readRecordLength(SequenceFile.java:1902)
>         at org.apache.hadoop.io.SequenceFile$Reader.next(SequenceFile.java:1932)
>         at org.apache.hadoop.io.SequenceFile$Reader.next(SequenceFile.java:1837)
>         at org.apache.hadoop.io.SequenceFile$Reader.next(SequenceFile.java:1883)
>         at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader.next(SequenceFileLogReader.java:121)
>         at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader.next(SequenceFileLogReader.java:113)
>         at org.apache.hadoop.hbase.regionserver.HRegion.replayRecoveredEdits(HRegion.java:1981)
>         at org.apache.hadoop.hbase.regionserver.HRegion.replayRecoveredEdits(HRegion.java:1956)
>         at org.apache.hadoop.hbase.regionserver.HRegion.replayRecoveredEditsIfAny(HRegion.java:1915)
>         at org.apache.hadoop.hbase.regionserver.HRegion.initialize(HRegion.java:344)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.instantiateRegion(HRegionServer.java:1490)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.openRegion(HRegionServer.java:1437)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer$Worker.run(HRegionServer.java:1345)
>         at java.lang.Thread.run(Thread.java:619)
> 2010-08-20 16:59:07,719 ERROR org.apache.hadoop.hbase.regionserver.RSZookeeperUpdater:
Aborting open of region 7c542d24d4496e273b739231b01885e6

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