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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HIVE-7956) When inserting into a bucketed table, all data goes to a single bucket [Spark Branch]
Date Sat, 06 Sep 2014 02:53:28 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14124277#comment-14124277
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Xuefu Zhang edited comment on HIVE-7956 at 9/6/14 2:52 AM:
-----------------------------------------------------------

Yes. Kryo can serialize HiveKey and deseriablize it back as an whole. Check out class KryoSerializer
and its usage in HiveMapFunction and other classes.


was (Author: xuefuz):
Yes. Kryo can serialize HiveKey and deseriablize it back as an whole.

> When inserting into a bucketed table, all data goes to a single bucket [Spark Branch]
> -------------------------------------------------------------------------------------
>
>                 Key: HIVE-7956
>                 URL: https://issues.apache.org/jira/browse/HIVE-7956
>             Project: Hive
>          Issue Type: Bug
>          Components: Spark
>            Reporter: Rui Li
>            Assignee: Rui Li
>
> I created a bucketed table:
> {code}
> create table testBucket(x int,y string) clustered by(x) into 10 buckets;
> {code}
> Then I run a query like:
> {code}
> set hive.enforce.bucketing = true;
> insert overwrite table testBucket select intCol,stringCol from src;
> {code}
> Here {{src}} is a simple textfile-based table containing 40000000 records (not bucketed).
The query launches 10 reduce tasks but all the data goes to only one of them.



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