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https://issues.apache.org/jira/browse/HIVE-6268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13889741#comment-13889741
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Sushanth Sowmyan commented on HIVE-6268:
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Hi Lefty, Yes, I think we should document it in a release note. I'm planning on
finishing HIVE-6332 in a week but it's good to have it in a release note as
well.
> Network resource leak with HiveClientCache when using HCatInputFormat
> ---------------------------------------------------------------------
>
> Key: HIVE-6268
> URL: https://issues.apache.org/jira/browse/HIVE-6268
> Project: Hive
> Issue Type: Bug
> Components: HCatalog
> Affects Versions: 0.12.0
> Reporter: Sushanth Sowmyan
> Assignee: Sushanth Sowmyan
> Fix For: 0.13.0
>
> Attachments: HIVE-6268.2.patch, HIVE-6268.3.patch, HIVE-6268.patch
>
>
> HCatInputFormat has a cache feature that allows HCat to cache hive client
> connections to the metastore, so as to not keep reinstantiating a new hive
> server every single time. This uses a guava cache of hive clients, which only
> evicts entries from cache on the next write, or by manually managing the
> cache.
> So, in a single threaded case, where we reuse the hive client, the cache
> works well, but in a massively multithreaded case, where each thread might
> perform one action, and then is never used, there are no more writes to the
> cache, and all the clients stay alive, thus keeping ports open.
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