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From "Gopinathan A (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5881) BuiltIn Gzip compressor & decompressor not getting pooled, leading to native memory leak
Date Thu, 26 Apr 2012 05:35:38 GMT
Gopinathan A created HBASE-5881:
-----------------------------------

             Summary: BuiltIn Gzip compressor & decompressor not getting pooled, leading
to native memory leak
                 Key: HBASE-5881
                 URL: https://issues.apache.org/jira/browse/HBASE-5881
             Project: HBase
          Issue Type: Bug
          Components: io
    Affects Versions: 0.92.1
            Reporter: Gopinathan A
            Priority: Critical
             Fix For: 0.92.2, 0.94.0, 0.96.0


This issue will occur only in hadoop 23.x & above/

In hadoop 0.20.x
{code}
public static void returnDecompressor(Decompressor decompressor) {
    if (decompressor == null) {
      return;
    }
    decompressor.reset();
    payback(decompressorPool, decompressor);
  }
{code}


In hadoop 0.23.x
{code}
  public static void returnDecompressor(Decompressor decompressor) {
    if (decompressor == null) {
      return;
    }
    // if the decompressor can't be reused, don't pool it.
    if (decompressor.getClass().isAnnotationPresent(DoNotPool.class)) {
      return;
    }
    decompressor.reset();
    payback(decompressorPool, decompressor);
  }
{code}

Here annotation has been added. By default this library will be loaded if there are no native
library.
{code}
@DoNotPool
public class BuiltInGzipDecompressor
{code}

Due to this each time new compressor/decompressor will be loaded, this leads to native memory
leak.
{noformat}
2012-04-25 22:11:48,093 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
[.gz]
2012-04-25 22:11:48,093 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
[.gz]
2012-04-25 22:11:48,093 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
[.gz]
{noformat}

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