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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2016/11/02 02:31:58 UTC
[jira] [Commented] (SPARK-18107) Insert overwrite statement runs
much slower in spark-sql than it does in hive-client
[ https://issues.apache.org/jira/browse/SPARK-18107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15627426#comment-15627426 ]
Apache Spark commented on SPARK-18107:
--------------------------------------
User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/15726
> 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
> Assignee: Liang-Chi Hsieh
> Fix For: 2.1.0
>
>
> 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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