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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7400) More reliable namenode health check to detect OS/HW issues
Date Sat, 15 Nov 2014 00:31:35 GMT
Ming Ma created HDFS-7400:

             Summary: More reliable namenode health check to detect OS/HW issues
                 Key: HDFS-7400
                 URL: https://issues.apache.org/jira/browse/HDFS-7400
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Ming Ma

We had this scenario on an active NN machine.

* Disk array controller firmware has a bug. So disks stop working.
* ZKFC and NN still considered the node healthy; Communications between ZKFC and ZK as well
as ZKFC and NN are good.
* The machine can be pinged.
* The machine can't be sshed.

So all clients and DNs can't use the NN. But ZKFC and NN still consider the node healthy.

The question is how we can have ZKFC and NN detect such OS/HW specific issues quickly? Some
ideas we discussed briefly,

* Have other machines help to make the decision whether the NN is actually healthy. Then you
have to figure out to make the decision accurate in the case of network issue, etc.
* Run OS/HW health check script external to ZKFC/NN on the same machine. If it detects disk
or other issues, it can reboot the machine for example.
* Run OS/HW health check script inside ZKFC/NN. For example NN's HAServiceProtocol#monitorHealth
can be modified to call such health check script.


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