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HADOOP-6754. DefaultCodec.createOutputStream() leaks memory. Contributed by Aaron Kimball. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1076314 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Thomas White 2011-03-02 18:01:11 +00:00
parent 2fbd0bfbeb
commit 420a029b75
2 changed files with 14 additions and 2 deletions
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3
CHANGES.txt
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@ -88,6 +88,9 @@ Trunk (unreleased changes)
HADOOP-7153. MapWritable violates contract of Map interface for equals()
and hashCode(). (Nicholas Telford via todd)
HADOOP-6754. DefaultCodec.createOutputStream() leaks memory.
(Aaron Kimball via tomwhite)
Release 0.22.0 - Unreleased
INCOMPATIBLE CHANGES

13
src/java/org/apache/hadoop/io/compress/DefaultCodec.java
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@ -19,18 +19,21 @@
package org.apache.hadoop.io.compress;
import java.io.IOException;
import java.io.OutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.compress.zlib.*;
import org.apache.hadoop.io.compress.zlib.ZlibFactory;
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class DefaultCodec implements Configurable, CompressionCodec {
private static final Log LOG = LogFactory.getLog(DefaultCodec.class);
Configuration conf;
@ -44,6 +47,12 @@ public class DefaultCodec implements Configurable, CompressionCodec {
public CompressionOutputStream createOutputStream(OutputStream out)
throws IOException {
// This may leak memory if called in a loop. The createCompressor() call
// may cause allocation of an untracked direct-backed buffer if native
// libs are being used (even if you close the stream). A Compressor
// object should be reused between successive calls.
LOG.warn("DefaultCodec.createOutputStream() may leak memory. "
+ "Create a compressor first.");
return new CompressorStream(out, createCompressor(),
conf.getInt("io.file.buffer.size", 4*1024));
}