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https://issues.apache.org/jira/browse/HBASE-5387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13206012#comment-13206012
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Mikhail Bautin commented on HBASE-5387:
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@Ted: I think this addresses the root cause of TestHFileBlock and
TestForceCacheImportantBlocks failures. As you suspected, Hadoop QA was
pointing to a real bug in HBase. However, I think we have had this issue for a
while (even in HFile v1), and it just got exposed as I increased the volume of
IO happening within a single unit test. I will add a ulimit setting to our
internal test runs so that we catch memory leaks like this in the future.
> Reuse compression streams in HFileBlock.Writer
> ----------------------------------------------
>
> Key: HBASE-5387
> URL: https://issues.apache.org/jira/browse/HBASE-5387
> Project: HBase
> Issue Type: Bug
> Reporter: Mikhail Bautin
> Assignee: Mikhail Bautin
> Attachments: Fix-deflater-leak-2012-02-10_18_48_45.patch
>
>
> We need to to reuse compression streams in HFileBlock.Writer instead of
> allocating them every time. The motivation is that when using Java's built-in
> implementation of Gzip, we allocate a new GZIPOutputStream object and an
> associated native data structure every time we create a compression stream.
> The native data structure is only deallocated in the finalizer. This is one
> suspected cause of recent TestHFileBlock failures on Hadoop QA:
> https://builds.apache.org/job/HBase-TRUNK/2658/testReport/org.apache.hadoop.hbase.io.hfile/TestHFileBlock/testPreviousOffset_1_/.
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