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From cho ju il <tjst...@kgrid.co.kr>
Subject Why does suddenly ha switching?
Date Fri, 01 Aug 2014 06:06:46 GMT
Why does suddenly ha switching? 
My hadoop cluster HA active namenode(host1) suddenly switch to standby namenode(host2). 
I could not found any error in hadoop logs (in any server) to identify the root cause. 
Tthe Namenodes following error appeared in hdfs logs frequently and non of the application
could read the HDFS files.
*** namenode log
2014-08-01 04:20:39,133 INFO org.apache.hadoop.hdfs.server.blockmanagement.CacheReplicationMonitor:
Rescanning after 30000 milliseconds
2014-08-01 04:20:39,151 INFO org.apache.hadoop.hdfs.server.blockmanagement.CacheReplicationMonitor:
Scanned 0 directive(s) and 0 block(s) in 19 millisecond(s).
2014-08-01 04:21:03,608 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Stopping
services started for active state
2014-08-01 04:21:03,728 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG:

*** zkfc log
2014-08-01 04:21:03,601 INFO org.apache.zookeeper.ClientCnxn: Client session timed out, have
not heard from server in 46910ms for sessionid 0x147000ee1f70137,  closing socket connection
and attempting reconnect

2014-08-01 04:21:03,703 INFO org.apache.hadoop.ha.ActiveStandbyElector: Session disconnected.
Entering neutral mode...

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