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https://issues.apache.org/jira/browse/HBASE-5387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13206040#comment-13206040
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Zhihong Yu edited comment on HBASE-5387 at 2/11/12 6:11 AM:
------------------------------------------------------------
See
http://crawler.archive.org/apidocs/org/archive/io/GzipHeader.html#MINIMAL_GZIP_HEADER_LENGTH
for where header length came from.
http://kickjava.com/src/java/util/zip/GZIPOutputStream.java.htm, line 109 gives
us better idea about header length.
was (Author: [email protected]):
See
http://crawler.archive.org/apidocs/org/archive/io/GzipHeader.html#MINIMAL_GZIP_HEADER_LENGTH
for where header length came from.
> Reuse compression streams in HFileBlock.Writer
> ----------------------------------------------
>
> Key: HBASE-5387
> URL: https://issues.apache.org/jira/browse/HBASE-5387
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.94.0
> Reporter: Mikhail Bautin
> Assignee: Mikhail Bautin
> Priority: Critical
> Fix For: 0.94.0
>
> 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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