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From "Xiaoyu Yao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7491) Add incremental blockreport latency to DN metrics
Date Sat, 21 Feb 2015 06:37:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14330037#comment-14330037
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Xiaoyu Yao commented on HDFS-7491:
----------------------------------

Hi Ming, could you use Time.monotonicNow() in elapsed time calculation? It will be more accurate
and safe from system time changes. Otherwise, the patch looks good to me.


> Add incremental blockreport latency to DN metrics
> -------------------------------------------------
>
>                 Key: HDFS-7491
>                 URL: https://issues.apache.org/jira/browse/HDFS-7491
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Ming Ma
>            Assignee: Ming Ma
>            Priority: Minor
>         Attachments: HDFS-7491-2.patch, HDFS-7491-3.patch, HDFS-7491-branch-2.patch,
HDFS-7491.patch
>
>
> In a busy cluster, IBR processing could be delayed due to NN FSNamesystem lock and cause
NN to throw NotReplicatedYetException to DFSClient and thus increase the overall application
latency.
> This will be taken care of when we address the NN FSNamesystem lock contention issue.
> It is useful if we can provide IBR latency metrics from DN's point of view.



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