[HBASE-6115] NullPointerException is thrown when root and meta table regions are assigning to another RS.

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.94.0
• Fix Version/s: 0.94.1
• Hadoop Flags: Reviewed
• Assignee: ramkrishna.s.vasudevan
• Reporter: rajeshbabu
• Created: 28/May/12 07:01
• Updated: 12/Oct/12 05:36
• Resolved: 29/May/12 16:23

Description

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.

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