[jira] [Commented] (FLINK-2716) Checksum method for DataSet and Graph

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

    [ https://issues.apache.org/jira/browse/FLINK-2716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15060402#comment-15060402 ] 

ASF GitHub Bot commented on FLINK-2716:
---------------------------------------

GitHub user greghogan opened a pull request:

    https://github.com/apache/flink/pull/1462

    [FLINK-2716] [gelly java scala] New checksum method on DataSet and Graph

    This implementation aggregates using `Object.hashCode`. As noted in FLINK-2716, `TypeComparator` has a hash function, which simply calls `hashCode` for basic types. For composite types (pojo, tuples, and case classes) the hash is computed over the keyed subset of fields, as noted by @StephanEwen. The differences between `hashCode` and `hash` are immaterial for this use case.
    
    Should this be added to the Python API? I am not finding count() on Python's `DataSet`.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/greghogan/flink 2716_checksum_method_for_dataset_and_graph

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/1462.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1462
    
----
commit 8ac28776a81bd70918b872d159f0a21c889d081d
Author: Greg Hogan <co...@greghogan.com>
Date:   2015-12-15T19:25:54Z

    [FLINK-2716] [gelly java scala] New checksum method on DataSet and Graph

----


> Checksum method for DataSet and Graph
> -------------------------------------
>
>                 Key: FLINK-2716
>                 URL: https://issues.apache.org/jira/browse/FLINK-2716
>             Project: Flink
>          Issue Type: Improvement
>          Components: Gelly, Java API, Scala API
>    Affects Versions: 0.10.0
>            Reporter: Greg Hogan
>            Assignee: Greg Hogan
>            Priority: Minor
>
> {{DataSet.count()}}, {{Graph.numberOfVertices()}}, and {{Graph.numberOfEdges()}} provide measures of the number of distributed data elements. New {{DataSet.checksum()}} and {{Graph.checksum()}} methods will summarize the content of data elements and support algorithm validation, integration testing, and benchmarking.



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