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https://issues.apache.org/jira/browse/HADOOP-7551?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eli Collins resolved HADOOP-7551.
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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: 0.20.204.0
> 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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