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https://issues.apache.org/jira/browse/MAPREDUCE-5125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13656711#comment-13656711
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Matt Foley commented on MAPREDUCE-5125:
---------------------------------------
Changed Target Version to 1.3.0 upon release of 1.2.0. Please change to 1.2.1
if you intend to submit a fix for branch-1.2.
> TestDFSIO should write less compressible data
> ---------------------------------------------
>
> Key: MAPREDUCE-5125
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5125
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: test
> Affects Versions: 2.0.3-alpha, 1.1.2
> Reporter: Todd Lipcon
> Priority: Minor
>
> Currently, TestDFSIO writes a short repeating string of sequential (byte)0
> through (byte)50. This makes its output very compressible (I measured 250:1
> by LZOing the resulting file). This makes the results of TestDFSIO very hard
> to compare when running on HDFS vs other file systems which may include some
> compression on the network, disk, or both -- what is ostensibly a benchmark
> of IO throughput yields completely skewed results towards the system with
> compression.
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