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https://issues.apache.org/jira/browse/HADOOP-13214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15306016#comment-15306016
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Illes S commented on HADOOP-13214:
----------------------------------
A workaround until the issue is fixed:
{code:java}
reader.sync(0);
reader.seek(reader.getPosition()); // drops buffered key-values without doing
I/O
reader.next(...); // yields key-values from the beginning of the file
{code}
> sync(0); next(); yields wrong key-values on block-compressed files
> ------------------------------------------------------------------
>
> Key: HADOOP-13214
> URL: https://issues.apache.org/jira/browse/HADOOP-13214
> Project: Hadoop Common
> Issue Type: Bug
> Components: io
> Reporter: Illes S
> Labels: easyfix, newbie
> Attachments: HADOOP-13214.patch
>
>
> Calling {{sync(0); next(...);}} on a block-compressed {{SequenceFileReader}}
> that has already been used may not yield the key-values at the beginning, but
> those following the previous position. The issue is caused by {{sync(0)}} not
> releasing previously buffered keys and values. The issue was introduced by
> HADOOP-6196
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