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https://issues.apache.org/jira/browse/HADOOP-2501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13095997#comment-13095997
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Grant Ingersoll commented on HADOOP-2501:
-----------------------------------------
Just came across this from a search looking for how to concat seq files. Note,
Mahout has a number of these things implemented in it's utils package (dump,
head, count, etc.) under the integration module. See the SequenceFileDumper
and various others (like the iterators, etc.)
> Implement utility-tools for working with SequenceFiles
> ------------------------------------------------------
>
> Key: HADOOP-2501
> URL: https://issues.apache.org/jira/browse/HADOOP-2501
> Project: Hadoop Common
> Issue Type: New Feature
> Components: io
> Reporter: Arun C Murthy
> Assignee: Enis Soztutar
>
> It would be nice to implement a bunch of utilities to work with SequenceFiles:
> * info (print-out header information such as key/value types, compression
> type/codec etc.)
> * cat
> * head/tail
> * merge multiple seq-files into one
> * ...
> I'd imagine this would look like:
> {noformat}
> $ bin/hadoop seq -info /user/joe/blah.seq
> $ bin/hadoop seq -head -n 10 /user/joe/blah.seq
> {noformat}
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