[jira] [Commented] (BEAM-840) Add Java SDK extension to support non-distributed sorting

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15746667#comment-15746667 ] 

ASF GitHub Bot commented on BEAM-840:
-------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/incubator-beam/pull/1327


> Add Java SDK extension to support non-distributed sorting
> ---------------------------------------------------------
>
>                 Key: BEAM-840
>                 URL: https://issues.apache.org/jira/browse/BEAM-840
>             Project: Beam
>          Issue Type: New Feature
>          Components: sdk-java-extensions
>            Reporter: Mitch Shanklin
>            Assignee: Mitch Shanklin
>            Priority: Minor
>             Fix For: 0.4.0-incubating
>
>
> Add an extension that provides a PTransform which performs local(non-distributed) sorting. It will sort in memory until the buffer is full, then flush to disk and use external sorting.
>     
> Consumes a PCollection of KVs from primary key to iterable of secondary key and value KVs and sorts the iterables. Would probably be called after a GroupByKey. Uses coders to convert secondary keys and values into byte arrays and does a lexicographical comparison on the secondary keys.
> Uses Hadoop as an external sorting library.



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