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From "Aditya Kishore" <adityakish...@gmail.com>
Subject Re: Review Request 22013: DRILL-855: Improve work assignment parallelization
Date Thu, 29 May 2014 08:55:06 GMT

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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/22013/#review44251
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exec/java-exec/src/test/java/org/apache/drill/exec/pop/TestFragmentChecker.java
<https://reviews.apache.org/r/22013/#comment78599>

    Will add a test as part of HBase scan distribution that I am working atm.


- Aditya Kishore


On May 28, 2014, 11:15 p.m., Aditya Kishore wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/22013/
> -----------------------------------------------------------
> 
> (Updated May 28, 2014, 11:15 p.m.)
> 
> 
> Review request for drill, Jacques Nadeau and Steven Phillips.
> 
> 
> Repository: drill-git
> 
> 
> Description
> -------
> 
> Currently if only a small number of endpoints have data affinity, all the work units
get assigned to this small subset leaving other endpoints in the cluster underutilized.
> 
> It will lead to poor query performance since the level of parallelization is reduced
below what is otherwise possible.
> 
> This JIRA intend to modify the assignment to do a slightly more equitable distribution
of work fragments among all available nodes while slightly favoring the nodes with data affinity.
> 
> This *favor* is controlled by the setting "drill.exec.work.affinity.factor" (defaults
to 1.2f).
> 
> As an example, let's say that there are 2 endpoints of which only one is with affinity
and 10 work fragments. In the current scheme of things, all of these work fragments will get
assigned to the single node with affinity. With the modified scheme and with default affinity
factor of 1.2, it will get 20% more assignment that it would get under equal distribution
(i.e. 6:4 instead of 5:5).
> 
> 
> Diffs
> -----
> 
>   distribution/src/resources/drill-override.conf a9316a9 
>   exec/java-exec/src/main/java/org/apache/drill/exec/ExecConstants.java d9e0833 
>   exec/java-exec/src/main/java/org/apache/drill/exec/physical/EndpointAffinity.java f3059ae

>   exec/java-exec/src/main/java/org/apache/drill/exec/planner/SimpleExecPlanner.java 4da6500

>   exec/java-exec/src/main/java/org/apache/drill/exec/planner/fragment/SimpleParallelizer.java
313a81d 
>   exec/java-exec/src/main/java/org/apache/drill/exec/planner/fragment/Wrapper.java 8602bf0

>   exec/java-exec/src/main/java/org/apache/drill/exec/work/foreman/Foreman.java eb1d738

>   exec/java-exec/src/main/resources/drill-module.conf 26205bd 
>   exec/java-exec/src/test/java/org/apache/drill/exec/pop/TestFragmentChecker.java 1b38dce

> 
> Diff: https://reviews.apache.org/r/22013/diff/
> 
> 
> Testing
> -------
> 
> 
> Thanks,
> 
> Aditya Kishore
> 
>


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