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https://issues.apache.org/jira/browse/PIG-4709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15029780#comment-15029780
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Pallavi Rao commented on PIG-4709:
----------------------------------
Before patch:
{code}
2015-11-27 14:04:16,811 [main] INFO
org.apache.pig.tools.pigstats.spark.SparkPigStats -
EexcutorDeserializeTime : 26668
2015-11-27 14:04:16,811 [main] INFO
org.apache.pig.tools.pigstats.spark.SparkPigStats - ExecutorRunTime :
110938
...
2015-11-27 14:04:16,812 [main] INFO
org.apache.pig.tools.pigstats.spark.SparkPigStats - ShuffleBytesWritten
: 21465486
2015-11-27 14:04:16,812 [main] INFO
org.apache.pig.tools.pigstats.spark.SparkPigStats - ShuffleWriteTime :
470661000
{code}
After patch:
{code}
2015-11-27 13:58:52,205 [main] INFO
org.apache.pig.tools.pigstats.spark.SparkPigStats -
EexcutorDeserializeTime : 20601
2015-11-27 13:58:52,205 [main] INFO
org.apache.pig.tools.pigstats.spark.SparkPigStats - ExecutorRunTime :
75101
2015-11-27 13:58:52,205 [main] INFO
org.apache.pig.tools.pigstats.spark.SparkPigStats - ResultSize : 12024
...
2015-11-27 13:58:52,205 [main] INFO
org.apache.pig.tools.pigstats.spark.SparkPigStats - ShuffleBytesWritten
: 1046
2015-11-27 13:58:52,205 [main] INFO
org.apache.pig.tools.pigstats.spark.SparkPigStats - ShuffleWriteTime :
3486000
{code}
> Improve performance of GROUPBY operator on Spark
> ------------------------------------------------
>
> Key: PIG-4709
> URL: https://issues.apache.org/jira/browse/PIG-4709
> Project: Pig
> Issue Type: Sub-task
> Components: spark
> Reporter: Pallavi Rao
> Assignee: Pallavi Rao
> Labels: spork
> Fix For: spark-branch
>
> Attachments: PIG-4709.patch
>
>
> Currently, the GROUPBY operator of PIG is mapped by Spark's CoGroup. When the
> grouped data is consumed by subsequent operations to perform algebraic
> operations, this is sub-optimal as there is lot of shuffle traffic.
> The Spark Plan must be optimized to use reduceBy, where possible, so that a
> combiner is used.
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