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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3515) [replication] ReplicationSource can miss a log after RS comes out of GC
Date Tue, 08 Feb 2011 20:09:57 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12992149#comment-12992149
] 

Jean-Daniel Cryans commented on HBASE-3515:
-------------------------------------------

Yes, I was planning to putting this in branch and trunk.

> [replication] ReplicationSource can miss a log after RS comes out of GC
> -----------------------------------------------------------------------
>
>                 Key: HBASE-3515
>                 URL: https://issues.apache.org/jira/browse/HBASE-3515
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.90.0
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>            Priority: Critical
>             Fix For: 0.90.1
>
>         Attachments: HBASE-3515.patch
>
>
> This is from Hudson build 1738, if a log is about to be rolled and the ZK connection
is already closed then the replication code will fail at adding the new log in ZK but the
log will still be rolled and it's possible that some edits will make it in.
> From the log:
> {quote}
> 2011-02-08 10:21:20,618 FATAL [RegionServer:0;vesta.apache.org,46117,1297160399378.logRoller]
regionserver.HRegionServer(1383):
>  ABORTING region server serverName=vesta.apache.org,46117,1297160399378, load=(requests=1525,
regions=12,
>  usedHeap=273, maxHeap=1244): Failed add log to list
> org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss
for 
>  /1/replication/rs/vesta.apache.org,46117,1297160399378/2/vesta.apache.org%3A46117.1297160480509
> ...
> 2011-02-08 10:21:22,444 DEBUG [MASTER_META_SERVER_OPERATIONS-vesta.apache.org:56008-0]
wal.HLogSplitter(258):
>  Splitting hlog 8 of 8: hdfs://localhost:55474/user/hudson/.logs/vesta.apache.org,46117,1297160399378/vesta.apache.org%3A46117.1297160480509,
length=0
> 2011-02-08 10:21:22,862 DEBUG [MASTER_META_SERVER_OPERATIONS-vesta.apache.org:56008-0]
wal.HLogSplitter(436):
>  Pushed=31 entries from hdfs://localhost:55474/user/hudson/.logs/vesta.apache.org,46117,1297160399378/vesta.apache.org%3A46117.1297160480509
> {quote}
> The easiest thing to do would be let the exception out and cancel the log roll.

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