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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7400) More reliable namenode health check to detect OS/HW issues
Date Sat, 15 Nov 2014 02:18:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14213281#comment-14213281
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Ming Ma commented on HDFS-7400:
-------------------------------

Thanks, [~andrew.wang] and [~aw] for the comments. Here is the info I have so far. I will
provide more data after I gather more data from our admins and HW engineers.

1. We couldn't access the machine except to reboot the machine via IPMI. So no chance to run
"df".
2. We didn't check the progress in ssh. But given all DNs couldn't connect to this NN at that
point, it looks like socket level issue.

> 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.
> Thoughts?



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