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https://issues.apache.org/jira/browse/MAPREDUCE-1914?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved MAPREDUCE-1914.
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Resolution: Fixed
> TrackerDistributedCacheManager never cleans its input directories
> -----------------------------------------------------------------
>
> Key: MAPREDUCE-1914
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1914
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Dick King
> Assignee: Dick King
> Attachments: MAPREDUCE-1914--2010-07-30--1336.patch
>
>
> When we localize a file into a node's cache, it's installed in a directory
> whose subroot is a random {{long}} . These {{long}} s all sit in a single
> flat directory [per disk, per cluster node]. When the cached file is no
> longer needed, its reference count becomes zero in a tracking data structure.
> The file then becomes eligible for deletion when the total amount of space
> occupied by cached files exceeds 10G [by default] or the total number of such
> files exceeds 10K.
> However, when we delete a cached file, we don't delete the directory that
> contains it; this importantly includes the elements of the flat directory,
> which then accumulate until they reach a system limit, 32K in some cases, and
> then the node stops working.
> We need to delete the flat directory when we delete the localized cache file
> it contains.
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