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https://issues.apache.org/jira/browse/HADOOP-4655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12677576#action_12677576
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Doug Cutting commented on HADOOP-4655:
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Do we want to deprecate the method that uses the cache? If so, we'd need to
make FileSystem instantiation more lightweight. Currently, e.g., HDFS makes a
call to the namenode to check version compatibility each time a
DistributedFileSystem is created. We'd probably want to cache that and/or do
it lazily.
> FileSystem.CACHE should be ref-counted
> --------------------------------------
>
> Key: HADOOP-4655
> URL: https://issues.apache.org/jira/browse/HADOOP-4655
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs, fs
> Affects Versions: 0.18.1, 0.18.2, 0.19.0, 0.19.1, 0.20.0
> Reporter: Hong Tang
> Assignee: dhruba borthakur
> Attachments: FileSystemUnique.patch
>
>
> FileSystem.CACHE is not ref-counted, and could lead to resource leakage.
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