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https://issues.apache.org/jira/browse/HBASE-10089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13841579#comment-13841579
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Mikhail Bautin commented on HBASE-10089:
----------------------------------------
Getting rid of intern() is fine with me. The original motivation was to reduce
memory usage. The fact that interned strings strings are not garbage-collected
(at least according to
http://stackoverflow.com/questions/2431540/garbage-collection-behaviour-for-string-intern
) and the use case of creating temporary tables for integration testing sound
like good reasons to remove intern().
> Metrics intern table names cause eventual permgen OOM in 0.94
> -------------------------------------------------------------
>
> Key: HBASE-10089
> URL: https://issues.apache.org/jira/browse/HBASE-10089
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.94.0, 0.94.14
> Reporter: Dave Latham
> Priority: Minor
>
> As part of the metrics system introduced in HBASE-4768 there are two places
> that hbase uses String interning ( SchemaConfigured and SchemaMetrics ).
> This includes interning table names. We have long running environment where
> we run regular integration tests on our application using hbase. Those tests
> create and drop tables with new names regularly. These leads to filling up
> the permgen with interned table names. Workaround is to periodically restart
> the region servers.
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