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Posted to common-dev@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2016/11/30 17:49:58 UTC
[jira] [Resolved] (HADOOP-13849) Bzip2 java-builtin and
system-native have almost the same compress speed
[ https://issues.apache.org/jira/browse/HADOOP-13849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steve Loughran resolved HADOOP-13849.
-------------------------------------
Resolution: Invalid
> 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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