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https://issues.apache.org/jira/browse/HADOOP-6843?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo (Nicholas), SZE resolved HADOOP-6843.
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Resolution: Not A Problem
This is not a problem anymore.
> Entries in the FileSystem's Cache could be cleared when they are not used
> -------------------------------------------------------------------------
>
> Key: HADOOP-6843
> URL: https://issues.apache.org/jira/browse/HADOOP-6843
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 0.20.0
> Reporter: Devaraj Das
> Attachments: TestFileSystemCache.java, fs-weak-ref.4.patch
>
>
> In FileSystem, there is a cache maintained for Filesystem instances. The
> entries in the cache are cleared only when explicit FileSystem.close is
> invoked. Applications are not careful on this aspect. Typically, they do
> FileSystem.get(), operate on the FileSystem, and then they just forget about
> it. Every FileSystem instance stores a reference to the Configuration object
> that it was created with. Over a period of time, as the cache grows, this can
> lead to OOM (we have seen this happening in our hadoop 20S clusters at Yahoo).
> This jira aims at addressing the above issue.
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