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https://issues.apache.org/jira/browse/MAPREDUCE-5948?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Junping Du updated MAPREDUCE-5948:
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Fix Version/s: 2.8.0
> org.apache.hadoop.mapred.LineRecordReader does not handle multibyte record
> delimiters well
> ------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-5948
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5948
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 0.20.2, 0.23.9, 2.2.0
> Environment: CDH3U2 Redhat linux 5.7
> Reporter: Kris Geusebroek
> Assignee: Akira Ajisaka
> Priority: Critical
> Fix For: 2.8.0, 2.7.2, 2.6.3, 3.0.0-alpha1
>
> Attachments: HADOOP-9867.patch, HADOOP-9867.patch, HADOOP-9867.patch,
> HADOOP-9867.patch, MAPREDUCE-5948.002.patch, MAPREDUCE-5948.003.patch
>
>
> Having defined a recorddelimiter of multiple bytes in a new InputFileFormat
> sometimes has the effect of skipping records from the input.
> This happens when the input splits are split off just after a
> recordseparator. Starting point for the next split would be non zero and
> skipFirstLine would be true. A seek into the file is done to start - 1 and
> the text until the first recorddelimiter is ignored (due to the presumption
> that this record is already handled by the previous maptask). Since the re
> ord delimiter is multibyte the seek only got the last byte of the delimiter
> into scope and its not recognized as a full delimiter. So the text is skipped
> until the next delimiter (ignoring a full record!!)
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