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Posted to mapreduce-issues@hadoop.apache.org by "Robert Joseph Evans (JIRA)" <ji...@apache.org> on 2012/12/18 17:54:13 UTC
[jira] [Commented] (MAPREDUCE-4888) NLineInputFormat drops data in
1.1 and beyond
[ https://issues.apache.org/jira/browse/MAPREDUCE-4888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13535038#comment-13535038 ]
Robert Joseph Evans commented on MAPREDUCE-4888:
------------------------------------------------
I really don't have time to work on this right now, if someone else wants to take a look at it that would be great. It probably will just involve undoing the changes to NLineInputFormat introduced in HADOOP-7823.
> NLineInputFormat drops data in 1.1 and beyond
> ---------------------------------------------
>
> Key: MAPREDUCE-4888
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4888
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv1
> Affects Versions: 1.1.0
> Reporter: Robert Joseph Evans
> Priority: Blocker
> Attachments: test.patch
>
>
> When trying to root cause why MAPREDUCE-4782 did not cause us issues on 1.0.2, I found out that HADOOP-7823 introduced essentially the exact same error into org.apache.hadoop.mapred.lib.NLineInputFormat.
> In 1.X org.apache.hadoop.mapred.lib.NLineInputFormat and org.apache.hadoop.mapreduce.lib.input.NLineInputFormat are separate implementations. The latter had an off by one error in it until MAPREDUCE-4782 fixed it. The former had no error in it until HADOOP-7823 introduced it in 1.1 and MAPREDUCE-375 combined the implementations together but picked the implementation with the off by one error in 0.21.
> I will attach a patch that exposes the error.
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