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https://issues.apache.org/jira/browse/HADOOP-11445?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ankit Kamboj updated HADOOP-11445:
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Affects Version/s: 2.4.0
> Bzip2Codec: Data block is skipped when position of newly created stream is
> equal to start of split
> --------------------------------------------------------------------------------------------------
>
> Key: HADOOP-11445
> URL: https://issues.apache.org/jira/browse/HADOOP-11445
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.4.0
> Reporter: Ankit Kamboj
>
> bz2 input files are handled by FileInputFormat+LineRecordReader. In
> LineRecordReader, bz2 specific compressed input stream is created to iterate
> over records. After every new creation, the stream points to the beginning of
> next data block. The logic to find the beginning of next block depends on
> start of the split. The search begins at 10 bytes behind the start of split.
> If the first search creates input stream whose position is before or at start
> of split, next block beginning is sought (assuming that the record reader for
> previous split would have already iterated over the the data block in which
> current start of split lies). If the split start is just at the byte where a
> newly created stream is positioned (start of data block), attempt is made to
> find beginning of next data block. This doesn't seem correct because this
> will result in jumping a whole block and will result in missing records.
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