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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11583) When PTF is used over a large partitions result could be corrupted
Date Fri, 25 Sep 2015 17:31:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14908368#comment-14908368
] 

Ashutosh Chauhan commented on HIVE-11583:
-----------------------------------------

Spilling is controlled by config {{hive.join.cache.size}} Perhaps, you can set that to very
low value in q test so as to trigger spilling and thus testing this without needing a large
input data.

> When PTF is used over a large partitions result could be corrupted
> ------------------------------------------------------------------
>
>                 Key: HIVE-11583
>                 URL: https://issues.apache.org/jira/browse/HIVE-11583
>             Project: Hive
>          Issue Type: Bug
>          Components: PTF-Windowing
>    Affects Versions: 0.14.0, 0.13.1, 0.14.1, 1.0.0, 1.2.0, 1.2.1
>         Environment: Hadoop 2.6 + Apache hive built from trunk
>            Reporter: Illya Yalovyy
>            Assignee: Illya Yalovyy
>            Priority: Critical
>             Fix For: 2.0.0
>
>         Attachments: HIVE-11583.patch
>
>
> Dataset: 
>  Window has 50001 record (2 blocks on disk and 1 block in memory)
>  Size of the second block is >32Mb (2 splits)
> Result:
> When the last block is read from the disk only first split is actually loaded. The second
split gets missed. The total count of the result dataset is correct, but some records are
missing and another are duplicated.
> Example:
> {code:sql}
> CREATE TABLE ptf_big_src (
>   id INT,
>   key STRING,
>   grp STRING,
>   value STRING
> ) ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t';
> LOAD DATA LOCAL INPATH '../../data/files/ptf_3blocks.txt.gz' OVERWRITE INTO TABLE ptf_big_src;
> SELECT grp, COUNT(1) cnt FROM ptf_big_trg GROUP BY grp ORDER BY cnt desc;
> ---
> -- A	25000
> -- B	20000
> -- C	5001
> ---
> CREATE TABLE ptf_big_trg AS SELECT *, row_number() OVER (PARTITION BY key ORDER BY grp)
grp_num FROM ptf_big_src;
> SELECT grp, COUNT(1) cnt FROM ptf_big_trg GROUP BY grp ORDER BY cnt desc;
> -- 
> -- A	34296
> -- B	15704
> -- C	1
> ---
> {code}
> Counts by 'grp' are incorrect!



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