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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6325) [replication] Race in ReplicationSourceManager.init can initiate a failover even if the node is alive
Date Fri, 20 Jul 2012 22:53:37 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419658#comment-13419658
] 

Hudson commented on HBASE-6325:
-------------------------------

Integrated in HBase-0.94-security #44 (See [https://builds.apache.org/job/HBase-0.94-security/44/])
    HBASE-6319  ReplicationSource can call terminate on itself and deadlock
HBASE-6325  [replication] Race in ReplicationSourceManager.init can initiate a failover even
if the node is alive (Revision 1363570)

     Result = FAILURE
jdcryans : 
Files : 
* /hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSource.java
* /hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSourceManager.java

                
> [replication] Race in ReplicationSourceManager.init can initiate a failover even if the
node is alive
> -----------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-6325
>                 URL: https://issues.apache.org/jira/browse/HBASE-6325
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.90.6, 0.92.1, 0.94.0
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>             Fix For: 0.92.2, 0.96.0, 0.94.1
>
>         Attachments: HBASE-6325-0.92-v2.patch, HBASE-6325-0.92.patch
>
>
> Yet another bug found during the leap second madness, it's possible to miss the registration
of new region servers so that in ReplicationSourceManager.init we start the failover of a
live and replicating region server. I don't think there's data loss but the RS that's being
failed over will die on:
> {noformat}
> 2012-07-01 06:25:15,604 FATAL org.apache.hadoop.hbase.regionserver.HRegionServer: ABORTING
region server sv4r23s48,10304,1341112194623: Writing replication status
> org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /hbase/replication/rs/sv4r23s48,10304,1341112194623/4/sv4r23s48%2C10304%2C1341112194623.1341112195369
>         at org.apache.zookeeper.KeeperException.create(KeeperException.java:111)
>         at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
>         at org.apache.zookeeper.ZooKeeper.setData(ZooKeeper.java:1246)
>         at org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.setData(RecoverableZooKeeper.java:372)
>         at org.apache.hadoop.hbase.zookeeper.ZKUtil.setData(ZKUtil.java:655)
>         at org.apache.hadoop.hbase.zookeeper.ZKUtil.setData(ZKUtil.java:697)
>         at org.apache.hadoop.hbase.replication.ReplicationZookeeper.writeReplicationStatus(ReplicationZookeeper.java:470)
>         at org.apache.hadoop.hbase.replication.regionserver.ReplicationSourceManager.logPositionAndCleanOldLogs(ReplicationSourceManager.java:154)
>         at org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.shipEdits(ReplicationSource.java:607)
>         at org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.run(ReplicationSource.java:368)
> {noformat}
> It seems to me that just refreshing {{otherRegionServers}} after getting the list of
{{currentReplicators}} would be enough to fix this.

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