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https://issues.apache.org/jira/browse/MAPREDUCE-7185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16765496#comment-16765496
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Hadoop QA commented on MAPREDUCE-7185:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 7s{color}
| {color:red} MAPREDUCE-7185 does not apply to trunk. Rebase required? Wrong
Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | MAPREDUCE-7185 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12958312/MAPREDUCE-7185.patch |
| Console output |
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/7584/console |
| Powered by | Apache Yetus 0.8.0 http://yetus.apache.org |
This message was automatically generated.
> Parallelize part files move in FileOutputCommitter
> --------------------------------------------------
>
> Key: MAPREDUCE-7185
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7185
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Affects Versions: 3.2.0, 2.9.2
> Reporter: Igor Dvorzhak
> Priority: Major
> Attachments: MAPREDUCE-7185.patch
>
>
> If map task outputs multiple files it could be slow to move them from temp
> directory to output directory in object stores.
> To improve performance we need to parallelize move of more than 1 file in
> FileOutputCommitter.
> Repro:
> Start spark-shell:
> {code:bash}
> spark-shell --num-executors 2 --executor-memory 10G --executor-cores 4 --conf
> spark.dynamicAllocation.maxExecutors=2
> {code}
> From spark-shell:
> {code:scala}
> val df = (1 to 10000).toList.toDF("value").withColumn("p", $"value" %
> 10).repartition(50)
> df.write.partitionBy("p").mode("overwrite").format("parquet").options(Map("path"
> -> s"gs://some/path")).saveAsTable("parquet_partitioned_bench")
> {code}
> With the fix execution time reduces from 130 seconds to 50 seconds.
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