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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7388) Improve the log for HA failover
Date Mon, 10 Nov 2014 23:32:33 GMT
Jing Zhao created HDFS-7388:

             Summary: Improve the log for HA failover
                 Key: HDFS-7388
                 URL: https://issues.apache.org/jira/browse/HDFS-7388
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ha
            Reporter: Jing Zhao

Currently to debug an issue during the NN HA failover (with automatic failover setup), we
usually need to check log from all the NN and ZKFC daemons to figure out what triggered the
failover. Possible reasons include NN health issue, connection issues between zkfc and NN,
connection issues between zkfc and ZK, and manual op started by admin. It will be helpful
to improve the log in NN and ZKFC and add more information to make the debug easier. 

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