[jira] [Updated] (GIRAPH-717) HiveJythonRunner with support for pure Jython value types.

["Nitay Joffe (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GIRAPH-717?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nitay Joffe updated GIRAPH-717:
-------------------------------

    Summary: HiveJythonRunner with support for pure Jython value types.  (was: Pure Jython support)
    
> HiveJythonRunner with support for pure Jython value types.
> ----------------------------------------------------------
>
>                 Key: GIRAPH-717
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-717
>             Project: Giraph
>          Issue Type: Bug
>            Reporter: Nitay Joffe
>            Assignee: Nitay Joffe
>
> This adds support for pure Jython jobs. Currently this runner is hooked up to work with Hive. I'll make it more generic later.
> A Jython job is made up of two Jython scripts:
> 1) launcher - this script is used to configure the job, it is only interpreted locally.
> 2) worker - this script is distributed to every worker and is used there.
> Running a Jython job is simply:
> HIVE_HOME=<x>
> HADOOP_HOME=<y>
> $HIVE_HOME/bin/hive --service jar <giraph-hive-jar> org.apache.giraph.hive.jython.HiveJythonRunner jython --launcher <launcher.py> --worker <worker.py>
> There are examples and tests in the diff. Here is one example:
> launcher: https://gist.github.com/nitay/a62e0a5d369a5e701fa3
> worker: https://gist.github.com/nitay/7834fd2b059527e65a36
> There are a few pieces to a Jython job, I'll go over each part here.
> The launcher defines the graph types (those IVEMM writables) and sets up the Hive vertex/edge inputs and output. Each graph type is one of the following:
> 1) A Java type. For example the user can specify simply IntWritable
> 2) A Jython type that implements Writable. In the example above the message value implements Writable.
> 3) A pure Jython type. The Java code will wrap these objects in a Writable wrapper that serializes Jython values using Pickle (jython IO framework).
> For Hive usage - if your value type is a primitive e.g. IntWritable or LongWritable, then you need not do anything. The Java code will automatically read/write the Hive table specified and convert between Hive types and the primitive Writable. The vertex_id type in the example works like this.
> If there is custom Jython types, the user must create types which implement JythonHiveReader/JythonHiveWriter (or JythonHiveIO which is both). These objects read/write Jython types from Hive. There are wrappers in the Java code which take HiveIO types and turn them into Jython types so that for example getMap() returns a Jython dictionary instead of a Java Map.
> There is also a PageRankBenchmark (from previous diff) implemented in Jython. Here's a run for comparison / sanity check:
> PageRankBenchmark with 10 workers, 100M vertices, 10B edges, 10 compute threads
> trunk:
>   https://gist.github.com/nitay/3170fa3b575d4d2e22a9
>   total time: 302466
> with this diff:
>   https://gist.github.com/nitay/a52b6d1d64e50ab9829e
>   total time: 306517
> in jython:
>   https://gist.github.com/nitay/3f2e758b2933c3521727
>   total time: 434730
> So we see that existing things are not affected (is there something else I should test?) and that Jython has around 40% overhead.

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