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From "Eli Collins (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HADOOP-7551) LocalDirAllocator should incorporate LocalStorage
Date Thu, 03 Nov 2011 20:15:32 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7551?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Eli Collins resolved HADOOP-7551.

    Resolution: Won't Fix

Per MAPREDUCE-3011 the if the conf given to the LocalDirAllocator is always updated by callers
(eg with input based on LocalStorage), as is currently the case, it doesn't need to be aware.
It would be good if LocalDirAllocator didn't need to be given a new conf but combining LocalDirAllocator
and LocalStorage is probably too invasive for a stable release. Closing as won't fix. 
> LocalDirAllocator should incorporate LocalStorage
> -------------------------------------------------
>                 Key: HADOOP-7551
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7551
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions:
>            Reporter: Eli Collins
> The o.a.h.fs.LocalDirAllocator is not aware of o.a.h.m.t.LocalStorage (introduced in
MAPREDUCE-2413) - it always considers the configured local dirs, not just the ones that happen
to be good. Therefore if there's a disk failure then *every* call to get a local path will
result in LocalDirAllocator#confChanged doing a disk check of *all* the configured local dirs.
It seems like LocalStorage should be a private class to LocalAllocator so that all users of
LocalDirAllocator benefit from the disk failure handling and all the various users of LocalDirAllocator
don't have to be modified to handle disk failures. Note that LocalDirAllocator already handles
faulty directories.

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