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https://issues.apache.org/jira/browse/MAPREDUCE-6558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wilfred Spiegelenburg updated MAPREDUCE-6558:
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Attachment: MAPREDUCE-6558.1.patch
A patch with test input that fails before the fix was made and passes after the
fix was made.
I have run all the tests that were there and they all still pass with this
change. The tests have been run a large number of times with different input
splits and none of them have failed.
The use cases that passed before the fix was applied have been documented in
the code.
> multibyte delimiters with compressed input files generate duplicate records
> ---------------------------------------------------------------------------
>
> Key: MAPREDUCE-6558
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6558
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv1, mrv2
> Affects Versions: 2.7.2
> Reporter: Wilfred Spiegelenburg
> Assignee: Wilfred Spiegelenburg
> Attachments: MAPREDUCE-6558.1.patch
>
>
> This is the follow up for MAPREDUCE-6549. Compressed files cause record
> duplications as shown in different junit tests. The number of duplicated
> records changes with the splitsize:
> Unexpected number of records in split (splitsize = 10)
> Expected: 41051
> Actual: 45062
> Unexpected number of records in split (splitsize = 100000)
> Expected: 41051
> Actual: 41052
> Test passes with splitsize = 147445 which is the compressed file length.The
> file is a bzip2 file with 100k blocks and a total of 11 blocks
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