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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-15313) Add export spark.yarn.archive or spark.yarn.jars variable in Hive on Spark document
Date Thu, 01 Dec 2016 05:20:58 GMT

    [ https://issues.apache.org/jira/browse/HIVE-15313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15710935#comment-15710935
] 

Xuefu Zhang commented on HIVE-15313:
------------------------------------

+1 from me as well. Let's first flush out everything around spark dependency and then provide
wiki documentation.

> Add export spark.yarn.archive or spark.yarn.jars variable in Hive on Spark document
> -----------------------------------------------------------------------------------
>
>                 Key: HIVE-15313
>                 URL: https://issues.apache.org/jira/browse/HIVE-15313
>             Project: Hive
>          Issue Type: Bug
>            Reporter: liyunzhang_intel
>            Priority: Minor
>         Attachments: performance.improvement.after.set.spark.yarn.archive.PNG
>
>
> According to [wiki|https://cwiki.apache.org/confluence/display/Hive/Hive+on+Spark%3A+Getting+Started],
run queries in HOS16 and HOS20 in yarn mode.
> Following table shows the difference in query time between HOS16 and HOS20.
> ||Version||Total time||Time for Jobs||Time for preparing jobs||
> |Spark16|51|39|12|
> |Spark20|54|40|14| 
>  HOS20 spends more time(2 secs) on preparing jobs than HOS16. After reviewing the source
code of spark, found that following point causes this:
> code:[Client#distribute|https://github.com/apache/spark/blob/master/yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala#L546],
In spark20, if spark cannot find spark.yarn.archive and spark.yarn.jars in spark configuration
file, it will first copy all jars in $SPARK_HOME/jars to a tmp directory and upload the tmp
directory to distribute cache. Comparing [spark16|https://github.com/apache/spark/blob/branch-1.6/yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala#L1145],

> In spark16, it searches spark-assembly*.jar and upload it to distribute cache.
> In spark20, it spends 2 more seconds to copy all jars in $SPARK_HOME/jar to a tmp directory
if we don't set "spark.yarn.archive" or "spark.yarn.jars".
> We can accelerate the startup of hive on spark 20 by settintg "spark.yarn.archive" or
"spark.yarn.jars":
> set "spark.yarn.archive":
> {code}
>  zip spark-archive.zip $SPARK_HOME/jars/*
> $ hadoop fs -copyFromLocal spark-archive.zip 
> $ echo "spark.yarn.archive=hdfs:///xxx:8020/spark-archive.zip" >> conf/spark-defaults.conf
> {code}
> set "spark.yarn.jars":
> {code}
> $ hadoop fs mkdir spark-2.0.0-bin-hadoop 
> $hadoop fs -copyFromLocal $SPARK_HOME/jars/* spark-2.0.0-bin-hadoop 
> $ echo "spark.yarn.jars=hdfs:///xxx:8020/spark-2.0.0-bin-hadoop/*" >> conf/spark-defaults.conf
> {code}
> Suggest to add this part in wiki.
> performance.improvement.after.set.spark.yarn.archive.PNG shows the detail performance
impovement after setting spark.yarn.archive in small queries.



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