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https://issues.apache.org/jira/browse/MAPREDUCE-1820?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Douglas updated MAPREDUCE-1820:
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Status: Open (was: Patch Available)
> InputSampler does not create a deep copy of the key object when creating a
> sample, which causes problems with some formats like SequenceFile<Text,Text>
> -------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1820
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1820
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Alex Kozlov
> Assignee: Alex Kozlov
> Attachments: M1820-4.patch, M1820-5.patch, MAPREDUCE-1820-2.patch,
> MAPREDUCE-1820-3.patch, MAPREDUCE-1820.patch
>
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> I tried to use the InputSampler on a SequenceFile<Text,Text> and found that
> it comes up with duplicate keys in the sample. The problem was tracked down
> to the fact that the Text object returned from the reader is essentially a
> wrapper pointing to a byte array, which changes as the sequence file reader
> progresses. There was also a bug in that the reader should be initialized
> before the use. The am attaching a patch that fixes both of the issues.
> --Alex K
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