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From "Liang-Chi Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-18107) Insert overwrite statement runs much slower in spark-sql than it does in hive-client
Date Thu, 27 Oct 2016 07:54:59 GMT

    [ https://issues.apache.org/jira/browse/SPARK-18107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15611083#comment-15611083
] 

Liang-Chi Hsieh commented on SPARK-18107:
-----------------------------------------

I can create a PR for this. But it may require [~snodawn] to verify the performance since
I don't have Hive 2.0.1 environment to compare them.

> Insert overwrite statement runs much slower in spark-sql than it does in hive-client
> ------------------------------------------------------------------------------------
>
>                 Key: SPARK-18107
>                 URL: https://issues.apache.org/jira/browse/SPARK-18107
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.0.0
>         Environment: spark 2.0.0
> hive 2.0.1
>            Reporter: J.P Feng
>
> I find insert overwrite statement running in spark-sql or spark-shell spends much more
time than it does in  hive-client (i start it in apache-hive-2.0.1-bin/bin/hive ), where spark
costs about ten minutes but hive-client just costs less than 20 seconds.
> These are the steps I took.
> Test sql is :
> insert overwrite table login4game partition(pt='mix_en',dt='2016-10-21')    select distinct
account_name,role_id,server,'1476979200' as recdate, 'mix' as platform, 'mix' as pid, 'mix'
as dev from tbllog_login  where pt='mix_en' and  dt='2016-10-21' ;
> there are 257128 lines of data in tbllog_login with partition(pt='mix_en',dt='2016-10-21')
> ps:
> I'm sure it must be "insert overwrite" costing a lot of time in spark, may be when doing
overwrite, it need to spend a lot of time in io or in something else.
> I also compare the executing time between insert overwrite statement and insert into
statement.
> 1. insert overwrite statement and insert into statement in spark:
> insert overwrite statement costs about 10 minutes
> insert into statement costs about 30 seconds
> 2. insert into statement in spark and insert into statement in hive-client:
> spark costs about 30 seconds
> hive-client costs about 20 seconds
> the difference is little that we can ignore
>  



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