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https://issues.apache.org/jira/browse/HIVE-12683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15060337#comment-15060337
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rohit garg commented on HIVE-12683:
-----------------------------------
yeah...it was application master..we read somewhere Tez AM memory and Xmx
settings should be same as tez container. So, in one of our tests and which ran
(as mentioned in the blog), we did
set tez.am.resource.memory.mb=59205;
set tez.am.launch.cmd-opts =-Xmx47364m;
We were tweaking the following properties mainly :
set tez.task.resource.memory.mb
set tez.am.resource.memory.mb
set tez.am.launch.cmd-opts
set hive.tez.container.size
set hive.tez.java.opts
set tez.am.grouping.max-size
> Does Tez run slower than hive on larger dataset (~2.5 TB)?
> ----------------------------------------------------------
>
> Key: HIVE-12683
> URL: https://issues.apache.org/jira/browse/HIVE-12683
> Project: Hive
> Issue Type: Bug
> Reporter: rohit garg
>
> We have started to look into testing tez query engine. From initial results,
> we are getting 30% performance boost over Hive on smaller data set(1-10 GB)
> but Hive starts to perform better than Tez as data size increases. Like when
> we run a hive query with Tez on about 2.3 TB worth of data, it performs worse
> than hive alone.(~20% less performance) Details are in the post below.
> On a cluster with 1.3 TB RAM, I set the following property :
> set tez.task.resource.memory.mb=10000; set tez.am.resource.memory.mb=59205;
> set tez.am.launch.cmd-opts =-Xmx47364m; set hive.tez.container.size=59205;
> set hive.tez.java.opts=-Xmx47364m; set tez.am.grouping.max-size=36700160000;
> Is it normal or I am missing some property / not configuring some property
> properly? Also, I am using an older version of Tez as of now. Could that be
> the issue too? I still have to bootstrap latest version of Tez on EMR and
> test it and see if that could do any better.
> Thought of asking here too
> http://www.jwplayer.com/blog/hive-with-tez-on-emr/
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