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From Something Something <luckyguy2...@yahoo.com>
Subject SessionExpiredException: KeeperErrorCode = Session expired for /hbase
Date Mon, 12 Oct 2009 05:50:04 GMT
Occasionally, I see the following exception in the log.  The severity of this is 'WARN', so
I am not sure if my MapReduce job is successful.  Can this message be ignored?  Sounds 'SEVERE'
to me.

Note:  I am running over 15000 jobs sequentially.  This happens occasionally after about
8000 jobs are processed, so it's a bit hard to debug.

I guess, I could look at the source code, and see what this message means. But I am being
lazy :)  Thanks in advance for your advice.


09/10/11 22:33:03 WARN zookeeper.ZooKeeperWrapper: Failed to create /hbase -- check quorum
servers, currently=localhost:2181org.apache.zookeeper.KeeperException$SessionExpiredException:
KeeperErrorCode = Session expired for /hbase        at
 org.apache.zookeeper.KeeperException.create(KeeperException.java:118)        at org.apache.zookeeper.KeeperException.create(KeeperException.java:42)  
     at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:522)        at org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.ensureExists(ZooKeeperWrapper.java:342)  
     at org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.ensureParentExists(ZooKeeperWrapper.java:365)  
     at org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.checkOutOfSafeMode(ZooKeeperWrapper.java:478)  
     at org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRootRegion(HConnectionManager.java:903)  
     at
 org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:573)  
     at org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:549)  
     at org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:623)  
     at org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:582)  
     at org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:549)  
     at org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:623)  
     at
 org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:586)  
     at org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:549)  
     at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:125)        at
org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:103)



      
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