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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1293) hfile doesn't recycle decompressors
Date Fri, 27 Mar 2009 22:56:50 GMT
hfile doesn't recycle decompressors
-----------------------------------

                 Key: HBASE-1293
                 URL: https://issues.apache.org/jira/browse/HBASE-1293
             Project: Hadoop HBase
          Issue Type: Bug
    Affects Versions: 0.20.0
         Environment: - all -
            Reporter: ryan rawson
             Fix For: 0.20.0


The Compression codec stuff from hadoop has the concept of recycling compressors and decompressors
- this is because a compression codec uses "direct buffers" which reside outside the JVM regular
heap space.  There is a risk that under heavy concurrent load we could run out of that 'direct
buffer' heap space in the JVM.

HFile does not call algorithm.returnDecompressor and returnCompressor.  We should fix that.


I found this bug via OOM crashes under jdk 1.7 - it appears to be partially due to the size
of my cluster (200gb, 800 regions, 19 servers) and partially due to weaknesses in JVM 1.7.

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