[HBASE-4893] HConnectionImplementation is closed but not deleted

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.90.1
• Fix Version/s: 0.90.6
• Component/s: Client

Environment

Linux 2.6, HBase-0.90.1

• Assignee: Mubarak Seyed
• Reporter: Mubarak Seyed
• Created: 29/Nov/11 19:45
• Updated: 20/Nov/15 11:52
• Resolved: 26/Jan/12 07:27

Description

In abort() of HConnectionManager$HConnectionImplementation, instance of HConnectionImplementation is marked as this.closed=true.

There is no way for client application to check the hbase client connection whether it is still opened/good (this.closed=false) or not. We need a method to validate the state of a connection like isClosed().

public boolean isClosed(){
   return this.closed;
} 

Once the connection is closed and it should get deleted. Client application still gets a connection from HConnectionManager.getConnection(Configuration) and tries to make a RPC call to RS, since connection is already closed, HConnectionImplementation.getRegionServerWithRetries throws RetriesExhaustedException with error message

Caused by: org.apache.hadoop.hbase.client.RetriesExhaustedException: Trying to contact region server null for region , row 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxx', but failed after 10 attempts.
Exceptions:
java.io.IOException: org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@7eab48a7 closed
java.io.IOException: org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@7eab48a7 closed
java.io.IOException: org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@7eab48a7 closed
java.io.IOException: org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@7eab48a7 closed
java.io.IOException: org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@7eab48a7 closed
java.io.IOException: org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@7eab48a7 closed
java.io.IOException: org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@7eab48a7 closed
java.io.IOException: org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@7eab48a7 closed
java.io.IOException: org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@7eab48a7 closed
java.io.IOException: org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@7eab48a7 closed
	at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getRegionServerWithRetries(HConnectionManager.java:1008)
	at org.apache.hadoop.hbase.client.HTable.get(HTable.java:546)

Issue Links

• relates to: HBASE-5289 NullPointerException in resetZooKeeperTrackers in HConnectionManager / HConnectionImplementation