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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2928) MR-2413 improvements
Date Thu, 22 Sep 2011 22:37:26 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13112973#comment-13112973
] 

Eli Collins commented on MAPREDUCE-2928:
----------------------------------------

The motivation for tracking numFailures is that the TT re-init code just wants to know if
there have been any failures since the last time it checked directories, this can easily be
determined by seeing if the total number of failures has changed. The isDiskFailed method
is stateful, eg you have to know whether you've called it previously (which is why TT#initialize
calls it and ignores the return value), ie it tells you if there have been any failures since
the last time *isDiskFailed* was called, not if there have been any failures since the disks
were checked. Make sense? It be might more clear if checkDirs returned the failure count but
it throws DiskErrors itself so that doesn't work. 


> MR-2413 improvements
> --------------------
>
>                 Key: MAPREDUCE-2928
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2928
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: tasktracker
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>             Fix For: 0.20.205.0
>
>         Attachments: mapreduce-2928-1.patch, mapreduce-2928-2.patch
>
>
> Tracks improvements to MR-2413. See [this comment|https://issues.apache.org/jira/browse/MAPREDUCE-2413?focusedCommentId=13095073&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13095073].

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