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Posted to issues@hbase.apache.org by "rajeshbabu (JIRA)" <ji...@apache.org> on 2012/05/28 09:06:23 UTC
[jira] [Commented] (HBASE-6115) NullPointerException is thrown when
root and meta table regions are assigning to another RS.
[ https://issues.apache.org/jira/browse/HBASE-6115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13284305#comment-13284305 ]
rajeshbabu commented on HBASE-6115:
-----------------------------------
This is because we are not waiting for root region location to set in root region tracker.
{code}
this.rootRegionTracker.waitRootRegionLocation(this.rpcTimeout);
{code}
This line is present in 90,92 and trunk but missing in 94
> 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
>
>
> 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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