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From "Gabi Kazav (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-4730) Join on more than 2^31 records on single reducer failed (wrong results)
Date Thu, 13 Jun 2013 18:37:21 GMT
Gabi Kazav created HIVE-4730:
--------------------------------

             Summary: 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: 0.11.0, 0.10.0, 0.9.0, 0.8.1, 0.8.0, 0.7.1
            Reporter: Gabi Kazav
            Priority: Critical


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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