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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7836) BlockManager Scalability Improvements
Date Tue, 03 Mar 2015 19:50:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14345610#comment-14345610
] 

Chris Nauroth commented on HDFS-7836:
-------------------------------------

I have one additional operability concern.  With off-heaping, we're going to lose the ability
to measure the size of the block map with well-known tools like {{jmap}}.  Do you have any
thoughts on compensating for this?  Maybe we could publish new JMX counters with the off-heap
size stats?

> BlockManager Scalability Improvements
> -------------------------------------
>
>                 Key: HDFS-7836
>                 URL: https://issues.apache.org/jira/browse/HDFS-7836
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Charles Lamb
>            Assignee: Charles Lamb
>         Attachments: BlockManagerScalabilityImprovementsDesign.pdf
>
>
> Improvements to BlockManager scalability.



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