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https://issues.apache.org/jira/browse/HADOOP-13849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tao Li reopened HADOOP-13849:
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I
> Bzip2 java-builtin and system-native have almost the same compress speed
> ------------------------------------------------------------------------
>
> Key: HADOOP-13849
> URL: https://issues.apache.org/jira/browse/HADOOP-13849
> Project: Hadoop Common
> Issue Type: Bug
> Components: common
> Affects Versions: 2.6.0
> Environment: os version: redhat6
> hadoop version: 2.6.0
> native bzip2 version: bzip2-devel-1.0.5-7.el6_0.x86_64
> Reporter: Tao Li
>
> I tested bzip2 java-builtin and system-native compression, and I found the
> compress speed is almost the same. (I think the system-native should have
> better compress speed than java-builtin)
> My test case:
> 1. input file: 2.7GB text file without compression
> 2. after bzip2 java-builtin compress: 457MB, 12min 4sec
> 3. after bzip2 system-native compress: 457MB, 12min 19sec
> My MapReduce Config:
> conf.set("mapreduce.fileoutputcommitter.marksuccessfuljobs", "false");
> conf.set("mapreduce.output.fileoutputformat.compress", "true");
> conf.set("mapreduce.output.fileoutputformat.compress.type", "BLOCK");
> conf.set("mapreduce.output.fileoutputformat.compress.codec",
> "org.apache.hadoop.io.compress.BZip2Codec");
> conf.set("io.compression.codec.bzip2.library", "java-builtin"); // for
> java-builtin
> conf.set("io.compression.codec.bzip2.library", "system-native"); // for
> system-native
> And I am sure I have enable the bzip2 native, the output of command "hadoop
> checknative -a" is as follows:
> Native library checking:
> hadoop: true /usr/lib/hadoop/lib/native/libhadoop.so.1.0.0
> zlib: true /lib64/libz.so.1
> snappy: true /usr/lib/hadoop/lib/native/libsnappy.so.1
> lz4: true revision:99
> bzip2: true /lib64/libbz2.so.1
> openssl: true /usr/lib64/libcrypto.so
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