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From "Dieter Plaetinck (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7760) BytesWritable / SequenceFile yields dummy linefeed at end as soon as content has one or more linefeeds.
Date Thu, 20 Oct 2011 09:34:10 GMT
BytesWritable / SequenceFile yields dummy linefeed at end as soon as content has one or more
linefeeds.
-------------------------------------------------------------------------------------------------------

                 Key: HADOOP-7760
                 URL: https://issues.apache.org/jira/browse/HADOOP-7760
             Project: Hadoop Common
          Issue Type: Bug
          Components: record
    Affects Versions: 0.20.2
         Environment: Easily reproducable on Debian Linux cluster but also on my Arch Linux
desktop.

I am aware there are some newer releases in the 0.20 series, but all changelogs and release
note links for those @ http://hadoop.apache.org/common/releases.html are broken, so I can't
check if this has been fixed and/or whether it's safe to upgrade.
            Reporter: Dieter Plaetinck
            Priority: Minor


I create SequenceFiles which have BytesWritable as values.
I notice that if I store content which contains no linefeeds ("\n") or one linefeed, in the
value, the value can also be read out of the sequencefile properly.
However, as soon as I store input which contains two or more linefeeds (which is actually
pretty much always the case), during the process of writing to the sequencefile and reading
my data back, one *extra* linefeed is yielded at the end of the value, a linefeed which did
not exist in the input.
So this effectively corrupts my data, although i could write a hacky workaround for it.
I have written a program that demonstrates the behavior, by showing what happens when writing
2 sequencefiles:
one that has a record which value contains one linefeeds.
another that has a record which value contains two linefeeds.
Upon reading, the latter value will contain 3 linefeeds.

Test file is : http://pastie.org/2728797

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