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From "Zhihong Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6115) NullPointerException is thrown when root and meta table regions are assigning to another RS.
Date Mon, 28 May 2012 20:53:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13284550#comment-13284550
] 

Zhihong Yu commented on HBASE-6115:
-----------------------------------

+1 from me.
                
> NullPointerException is thrown when root and meta table regions are assigning to another
RS.
> --------------------------------------------------------------------------------------------
>
>                 Key: HBASE-6115
>                 URL: https://issues.apache.org/jira/browse/HBASE-6115
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.94.0
>            Reporter: rajeshbabu
>            Assignee: rajeshbabu
>            Priority: Minor
>             Fix For: 0.94.1
>
>         Attachments: HBASE-6115_0.94.patch
>
>
> Lets suppose we have two region servers RS1 and RS2.
> If region server (RS1) having root and meta regions went down, master will assign them
to another region server RS2. At that time recieved NullPointerException.
> {code}
> 2012-05-04 20:19:52,912 DEBUG org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation:
Looked up root region location, connection=org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@25de152f;
serverName=
> 2012-05-04 20:19:52,914 DEBUG org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation:
Looked up root region location, connection=org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@25de152f;
serverName=
> 2012-05-04 20:19:52,916 WARN org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler:
Exception running postOpenDeployTasks; region=1028785192
> java.lang.NullPointerException
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processBatchCallback(HConnectionManager.java:1483)
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processBatch(HConnectionManager.java:1367)
> at org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:945)
> at org.apache.hadoop.hbase.client.HTable.doPut(HTable.java:801)
> at org.apache.hadoop.hbase.client.HTable.put(HTable.java:776)
> at org.apache.hadoop.hbase.catalog.MetaEditor.put(MetaEditor.java:98)
> at org.apache.hadoop.hbase.catalog.MetaEditor.putToCatalogTable(MetaEditor.java:88)
> at org.apache.hadoop.hbase.catalog.MetaEditor.updateLocation(MetaEditor.java:259)
> at org.apache.hadoop.hbase.catalog.MetaEditor.updateMetaLocation(MetaEditor.java:221)
> at org.apache.hadoop.hbase.regionserver.HRegionServer.postOpenDeployTasks(HRegionServer.java:1625)
> at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler$PostOpenDeployTasksThread.run(OpenRegionHandler.java:241)
> 2012-05-04 20:19:52,920 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Closing .META.,,1.1028785192:
disabling compactions & flushes
> 2012-05-04 20:19:52,920 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Updates disabled
for region .META.,,1.1028785192
> {code}

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