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From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9208) Disabling atime may fail clients like distCp
Date Thu, 15 Oct 2015 19:48:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14959496#comment-14959496
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Mingliang Liu commented on HDFS-9208:
-------------------------------------

Hi [~kihwal], this is on my list this week but I'm not working on this actively. Sorry for
the delay. I need more context for the options.

I assign it back to you in case you're blocked.

> Disabling atime may fail clients like distCp
> --------------------------------------------
>
>                 Key: HDFS-9208
>                 URL: https://issues.apache.org/jira/browse/HDFS-9208
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Kihwal Lee
>            Assignee: Mingliang Liu
>
> When atime is disabled, {{setTimes()}} throws an exception if the passed-in atime is
not -1.  But since atime is not -1, distCp fails when it tries to set the mtime and atime.

> There are several options:
> 1) make distCp check for 0 atime and call {{setTimes()}} with -1. I am not very enthusiastic
about it.
> 2) make NN also accept 0 atime in addition to -1, when the atime support is disabled.
> 3) support setting mtime & atime regardless of the atime support.  The main reason
why atime is disabled is to avoid edit logging/syncing during {{getBlockLocations()}} read
calls. Explicit setting can be allowed.



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