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From "Chen Liang (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HDFS-11907) NameNodeResourceChecker should avoid calling df.getAvailable too frequently
Date Thu, 01 Jun 2017 00:25:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16032251#comment-16032251
] 

Chen Liang edited comment on HDFS-11907 at 6/1/17 12:24 AM:
------------------------------------------------------------

Thanks [~hanishakoneru] for the review, and thanks [~arpitagarwal] for the comments! all addressed
in v003 patch.


was (Author: vagarychen):
Thanks [~arpitagarwal] for the comments! all addressed in v003 patch.

> NameNodeResourceChecker should avoid calling df.getAvailable too frequently
> ---------------------------------------------------------------------------
>
>                 Key: HDFS-11907
>                 URL: https://issues.apache.org/jira/browse/HDFS-11907
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Chen Liang
>            Assignee: Chen Liang
>         Attachments: HDFS-11907.001.patch, HDFS-11907.002.patch, HDFS-11907.003.patch
>
>
> Currently, {{HealthMonitor#doHealthChecks}} invokes {{NameNode#monitorHealth}} which
ends up invoking {{NameNodeResourceChecker#isResourceAvailable}}, at the frequency of once
per second by default. And NameNodeResourceChecker#isResourceAvailable invokes {{df.getAvailable();}}
every time it is called.
> Since available space information should rarely be changing dramatically at the pace
of per second. A cached value should be sufficient. i.e. only try to get the updated value
when the cached value is too old. otherwise simply return the cached value. This way df.getAvailable()
gets invoked less.
> Thanks [~arpitagarwal] for the offline discussion.



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