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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8000) Potential deadlock #HeartbeatManager
Date Sun, 29 Mar 2015 16:36:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14385843#comment-14385843

Brahma Reddy Battula commented on HDFS-8000:

Thanks for taking look into this issue...
It appears that you have debug logging enabled for block state changes. Is that right?

Yes, As DN is not getting registering with NN, I had started NN in debug mode...Since I configured
48 datadir's and have 90000000+ Blocks,,DN is taking more time for block scanning and cluster
is non-functional..
Perhaps the logging could be moved outside of the lock, similar to what we've done in other
recent patches.
Yes,.Moving out always Good..

Here one more question is NN is taking 50 mins to load 7 GB fsimage..Which I need to look

> Potential deadlock #HeartbeatManager
> ------------------------------------
>                 Key: HDFS-8000
>                 URL: https://issues.apache.org/jira/browse/HDFS-8000
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Brahma Reddy Battula
>            Assignee: Brahma Reddy Battula
>         Attachments: NNtd.out
> Cluster loaded with 90000000+ Blocks
> Restart DN
>  access NN UI..Then NN will  got Hang
> Will attach td..

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