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From "Liang Xie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6110) adding more slow action log in critical write path
Date Thu, 20 Mar 2014 03:12:44 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13941350#comment-13941350
] 

Liang Xie commented on HDFS-6110:
---------------------------------

Yes, we used 100ms internally:)

> adding more slow action log in critical write path
> --------------------------------------------------
>
>                 Key: HDFS-6110
>                 URL: https://issues.apache.org/jira/browse/HDFS-6110
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 3.0.0, 2.3.0
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>         Attachments: HDFS-6110-v2.txt, HDFS-6110.txt
>
>
> After digging a HBase write spike issue caused by slow buffer io in our cluster, just
realize we'd better to add more abnormal latency warning log in write flow, such that if other
guys hit HLog sync spike, we could know more detail info from HDFS side at the same time.
> Patch will be uploaded soon.



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