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Date: Sun, 16 Jun 2013 19:49:20 +0000 (UTC)
From: "Gabi Kazav (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12652723.1371148606917.122503.1371412160462@arcas>
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Subject: [jira] [Commented] (HIVE-4730) Join on more than 2^31 records on
 single reducer failed (wrong results)
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    [ https://issues.apache.org/jira/browse/HIVE-4730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13684759#comment-13684759 ] 

Gabi Kazav commented on HIVE-4730:
----------------------------------

Looks good, thanks!
                
> Join on more than 2^31 records on single reducer failed (wrong results)
> -----------------------------------------------------------------------
>
>                 Key: HIVE-4730
>                 URL: https://issues.apache.org/jira/browse/HIVE-4730
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 0.7.1, 0.8.0, 0.8.1, 0.9.0, 0.10.0, 0.11.0
>            Reporter: Gabi Kazav
>            Assignee: Navis
>            Priority: Critical
>         Attachments: HIVE-4730.D11283.1.patch
>
>
> join on more than 2^31 rows leads to wrong results. for example:
> Create table small_table (p1 string) ROW FORMAT DELIMITED    LINES TERMINATED BY  '\n';
> Create table big_table (p1 string) ROW FORMAT DELIMITED    LINES TERMINATED BY  '\n';
> Loading 1 row to small_table (the value 1).
> Loading 2149580800 rows to big_table with the same value (1 on this case).
> create table output as select a.p1 from  big_table a join small_table b on (a.p1=b.p1);
> select count(*) from output ; will return only 1 row...
> the reducer syslog:
> ...
> 2013-06-13 17:20:59,254 INFO ExecReducer: ExecReducer: processing 2147000000 rows: used memory = 32925960
> 2013-06-13 17:21:00,745 INFO ExecReducer: ExecReducer: processing 2148000000 rows: used memory = 12815184
> 2013-06-13 17:21:02,205 INFO ExecReducer: ExecReducer: processing 2149000000 rows: used memory = 26684552   <-- looks like wrong value..
> ...
> 2013-06-13 17:21:04,062 INFO ExecReducer: ExecReducer: processed 2149580801 rows: used memory = 17715896
> 2013-06-13 17:21:04,062 INFO org.apache.hadoop.hive.ql.exec.JoinOperator: 4 finished. closing...
> 2013-06-13 17:21:04,062 INFO org.apache.hadoop.hive.ql.exec.JoinOperator: 4 forwarded 1 rows
> 2013-06-13 17:21:05,791 INFO org.apache.hadoop.hive.ql.exec.JoinOperator: SKEWJOINFOLLOWUPJOBS:0
> 2013-06-13 17:21:05,792 INFO org.apache.hadoop.hive.ql.exec.SelectOperator: 5 finished. closing...
> 2013-06-13 17:21:05,792 INFO org.apache.hadoop.hive.ql.exec.SelectOperator: 5 forwarded 1 rows
> 2013-06-13 17:21:05,792 INFO org.apache.hadoop.hive.ql.exec.FileSinkOperator: 6 finished. closing...
> 2013-06-13 17:21:05,792 INFO org.apache.hadoop.hive.ql.exec.FileSinkOperator: 6 forwarded 0 rows
> 2013-06-13 17:21:05,946 INFO org.apache.hadoop.hive.ql.exec.FileSinkOperator: TABLE_ID_1_ROWCOUNT:1
> 2013-06-13 17:21:05,946 INFO org.apache.hadoop.hive.ql.exec.SelectOperator: 5 Close done
> 2013-06-13 17:21:05,946 INFO org.apache.hadoop.hive.ql.exec.JoinOperator: 4 Close done

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