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From "Illes S (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13214) sync(0); next(); yields wrong key-values on block-compressed files
Date Sun, 29 May 2016 18:17:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15306016#comment-15306016
] 

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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