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Pig, mail # dev - Review Request: disable optimizations via pig properties


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Re: Review Request: disable optimizations via pig properties
Travis Crawford 2013-05-13, 21:18

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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/11032/#review20501
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Tested disabling this rule in three ways:

PIG_CONF_DIR=/etc/pig/conf ./bin/pig -c query.pig
set pig.optimizer.rules.disabled 'ColumnMapKeyPrune';

PIG_CONF_DIR=/etc/pig/conf ./bin/pig -Dpig.optimizer.rules.disabled=ColumnMapKeyPrune -c query.pig
--set pig.optimizer.rules.disabled 'ColumnMapKeyPrune';

PIG_CONF_DIR=/etc/pig/conf ./bin/pig -t ColumnMapKeyPrune -c query.pig
--set pig.optimizer.rules.disabled 'ColumnMapKeyPrune';

The rules report looked like this in all cases:

2013-05-13 20:16:15,594 [main] INFO  org.apache.pig.newplan.logical.optimizer.LogicalPlanOptimizer - {RULES_ENABLED=[AddForEach, DuplicateForEachColumnRewrite, GroupByConstParallelSetter, ImplicitSplitInserter, LimitOptimizer, LoadTypeCastInserter, MergeFilter, MergeForEach, PartitionFilterOptimizer, PushDownForEachFlatten, PushUpFilter, SplitFilter, StreamTypeCastInserter], RULES_DISABLED=[ColumnMapKeyPrune, FilterLogicExpressionSimplifier]}

Note that FilterLogicExpressionSimplifier is disabled by default.
src/org/apache/pig/Main.java
<https://reviews.apache.org/r/11032/#comment42245>

    This conditional has been removed to fix what I believe is a bug. Here we only publish this property if rules have been disabled. However, in HExecutionEngine.java line 251 the property is required to exist. I believe this bug snuck in because FilterLogicExpressionSimplifier is disabled by default so there's typically something disabled.
- Travis Crawford
On May 13, 2013, 8:35 p.m., Travis Crawford wrote:
>
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> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/11032/
> -----------------------------------------------------------
>
> (Updated May 13, 2013, 8:35 p.m.)
>
>
> Review request for pig, Julien Le Dem, Bill Graham, and Feng Peng.
>
>
> Description
> -------
>
> Update pig to allow disabling optimizations via pig properties. Currently optimizations must be disabled via command-line options. Pig properties can be set in pig.properties, "set" commands in scripts themselves, and command-line -D options.
>
> The use-case is, for scripts that require certain optimizations to be disabled, allowing the script itself to disable the optimization. Currently whatever runs the script needs to specially handle disabling the optimization for that specific query.
>
>
> This addresses bug PIG-3317.
>     https://issues.apache.org/jira/browse/PIG-3317
>
>
> Diffs
> -----
>
>   src/docs/src/documentation/content/xdocs/perf.xml 108ae7e
>   src/org/apache/pig/Main.java f97ed9f
>   src/org/apache/pig/PigConstants.java ea77e97
>   src/org/apache/pig/backend/hadoop/executionengine/HExecutionEngine.java 4dab4e8
>   src/org/apache/pig/newplan/logical/optimizer/LogicalPlanOptimizer.java d26f381
>   test/org/apache/pig/test/TestEvalPipeline2.java 39cf807
>
> Diff: https://reviews.apache.org/r/11032/diff/
>
>
> Testing
> -------
>
> Manually tested on a fully-distributed cluster.
>
> THIS FAILS:
> PIG_CONF_DIR=/etc/pig/conf ./bin/pig -c query.pig
>
> THIS WORKS:
> PIG_CONF_DIR=/etc/pig/conf ./bin/pig -Dpig.optimizer.rules.disabled=ColumnMapKeyPrune -c query.pig
>
> Notice how "-Dpig.optimizer.rules.disabled=ColumnMapKeyPrune" specifies a pig property, which could be in pig.properties, or the script itself.
>
>
> Failure message:
>
> Pig Stack Trace
> ---------------
> ERROR 2229: Couldn't find matching uid -1 for project (Name: Project Type: bytearray Uid: 97550 Input: 0 Column: 1)
>
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1067: Unable to explain alias null
> at org.apache.pig.PigServer.explain(PigServer.java:1057)
> at org.apache.pig.tools.grunt.GruntParser.explainCurrentBatch(GruntParser.java:419)
> at org.apache.pig.tools.grunt.GruntParser.processExplain(GruntParser.java:351)