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Date: Tue, 3 Jan 2017 06:22:58 +0000 (UTC)
From: "Ferdinand Xu (JIRA)" <jira@apache.org>
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Subject: [jira] [Resolved] (HIVE-15313) Add export spark.yarn.archive or
 spark.yarn.jars variable in Hive on Spark document
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archived-at: Tue, 03 Jan 2017 06:23:00 -0000


     [ https://issues.apache.org/jira/browse/HIVE-15313?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ferdinand Xu resolved HIVE-15313.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 2.2.0

Updated the (Configuring Hive section  https://cwiki.apache.org/confluence/display/Hive/Hive+on+Spark%3A+Getting+Started#HiveonSpark:GettingStarted-ConfiguringHive). Thanks [~kellyzly] [~xuefuz] and [~lirui] for the review and contribution.

> 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
>            Assignee: liyunzhang_intel
>            Priority: Minor
>             Fix For: 2.2.0
>
>         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}
> cd $SPARK_HOME/jars
> zip spark-archive.zip ./*.jar # this is important, enter the jars folder then zip
> $ 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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