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https://issues.apache.org/jira/browse/MAPREDUCE-7037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16327299#comment-16327299
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Jason Lowe commented on MAPREDUCE-7037:
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The array itself is not used, but the act of filling in the array appears to
have side-effects that are important. For example, {{rackToNodes}} appears to
be initialized during the construction of the array.
> Possible dead code in CombineFileInputFormat
> --------------------------------------------
>
> Key: MAPREDUCE-7037
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7037
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Lior Regev
> Priority: Minor
> Labels: newbie
>
> I found that in the file:
> hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/input/CombineFileInputFormat.java:280
> There's a generation of OneFileInfo[] without using that array ever again.
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