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Posted to dev@hive.apache.org by "Phabricator (JIRA)" <ji...@apache.org> on 2013/01/03 09:02:13 UTC
[jira] [Updated] (HIVE-3699) Multiple insert overwrite into
multiple tables query stores same results in all tables
[ https://issues.apache.org/jira/browse/HIVE-3699?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Phabricator updated HIVE-3699:
------------------------------
Attachment: HIVE-3699.D7743.1.patch
navis requested code review of "HIVE-3699 [jira] Multiple insert overwrite into multiple tables query stores same results in all tables".
Reviewers: JIRA
DPAL-1952 Multiple insert overwrite into multiple tables query stores same results in all tables
(Note: This might be related to HIVE-2750)
I am doing a query with multiple INSERT OVERWRITE to multiple tables in order to scan the dataset only 1 time, and i end up having all these tables with the same content ! It seems the GROUP BY query that returns results is overwriting all the temp tables.
Weird enough, if i had further GROUP BY queries into additional temp tables, grouped by a different field, then all temp tables, even the ones that would have been wrong content are all correctly populated.
This is the misbehaving query:
FROM nikon
INSERT OVERWRITE TABLE e1
SELECT qs_cs_s_aid AS Emplacements, COUNT AS Impressions
WHERE qs_cs_s_cat='PRINT' GROUP BY qs_cs_s_aid
INSERT OVERWRITE TABLE e2
SELECT qs_cs_s_aid AS Emplacements, COUNT AS Vues
WHERE qs_cs_s_cat='VIEW' GROUP BY qs_cs_s_aid
;
It launches only one MR job and here are the results. Why does table 'e1' contains results from table 'e2' ?! Table 'e1' should have been empty (see individual SELECTs further below)
hive> SELECT * from e1;
OK
NULL 2
1627575 25
1627576 70
1690950 22
1690952 42
1696705 199
1696706 66
1696730 229
1696759 85
1696893 218
Time taken: 0.229 seconds
hive> SELECT * from e2;
OK
NULL 2
1627575 25
1627576 70
1690950 22
1690952 42
1696705 199
1696706 66
1696730 229
1696759 85
1696893 218
Time taken: 0.11 seconds
Here is are the result to the indiviual queries (only the second query returns a result set):
hive> SELECT qs_cs_s_aid AS Emplacements, COUNT AS Impressions FROM nikon
WHERE qs_cs_s_cat='PRINT' GROUP BY qs_cs_s_aid;
(...)
OK
<- There are no results, this is normal
Time taken: 41.471 seconds
hive> SELECT qs_cs_s_aid AS Emplacements, COUNT AS Vues FROM nikon
WHERE qs_cs_s_cat='VIEW' GROUP BY qs_cs_s_aid;
(...)
OK
NULL 2
1627575 25
1627576 70
1690950 22
1690952 42
1696705 199
1696706 66
1696730 229
1696759 85
1696893 218
Time taken: 39.607 seconds
TEST PLAN
EMPTY
REVISION DETAIL
https://reviews.facebook.net/D7743
AFFECTED FILES
ql/src/java/org/apache/hadoop/hive/ql/ppd/OpProcFactory.java
ql/src/test/queries/clientpositive/multi_insert_gby.q
ql/src/test/results/clientpositive/multi_insert_gby.q.out
MANAGE HERALD DIFFERENTIAL RULES
https://reviews.facebook.net/herald/view/differential/
WHY DID I GET THIS EMAIL?
https://reviews.facebook.net/herald/transcript/18627/
To: JIRA, navis
> Multiple insert overwrite into multiple tables query stores same results in all tables
> --------------------------------------------------------------------------------------
>
> Key: HIVE-3699
> URL: https://issues.apache.org/jira/browse/HIVE-3699
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.9.0
> Environment: Cloudera 4.1 on Amazon Linux (rebranded Centos 6): hive-0.9.0+150-1.cdh4.1.1.p0.4.el6.noarch
> Reporter: Alexandre Fouché
> Attachments: HIVE-3699.D7743.1.patch
>
>
> (Note: This might be related to HIVE-2750)
> I am doing a query with multiple INSERT OVERWRITE to multiple tables in order to scan the dataset only 1 time, and i end up having all these tables with the same content ! It seems the GROUP BY query that returns results is overwriting all the temp tables.
> Weird enough, if i had further GROUP BY queries into additional temp tables, grouped by a different field, then all temp tables, even the ones that would have been wrong content are all correctly populated.
> This is the misbehaving query:
> FROM nikon
> INSERT OVERWRITE TABLE e1
> SELECT qs_cs_s_aid AS Emplacements, COUNT(*) AS Impressions
> WHERE qs_cs_s_cat='PRINT' GROUP BY qs_cs_s_aid
> INSERT OVERWRITE TABLE e2
> SELECT qs_cs_s_aid AS Emplacements, COUNT(*) AS Vues
> WHERE qs_cs_s_cat='VIEW' GROUP BY qs_cs_s_aid
> ;
> It launches only one MR job and here are the results. Why does table 'e1' contains results from table 'e2' ?! Table 'e1' should have been empty (see individual SELECTs further below)
> hive> SELECT * from e1;
> OK
> NULL 2
> 1627575 25
> 1627576 70
> 1690950 22
> 1690952 42
> 1696705 199
> 1696706 66
> 1696730 229
> 1696759 85
> 1696893 218
> Time taken: 0.229 seconds
> hive> SELECT * from e2;
> OK
> NULL 2
> 1627575 25
> 1627576 70
> 1690950 22
> 1690952 42
> 1696705 199
> 1696706 66
> 1696730 229
> 1696759 85
> 1696893 218
> Time taken: 0.11 seconds
> Here is are the result to the indiviual queries (only the second query returns a result set):
> hive> SELECT qs_cs_s_aid AS Emplacements, COUNT(*) AS Impressions FROM nikon
> WHERE qs_cs_s_cat='PRINT' GROUP BY qs_cs_s_aid;
> (...)
> OK
> <- There are no results, this is normal
> Time taken: 41.471 seconds
> hive> SELECT qs_cs_s_aid AS Emplacements, COUNT(*) AS Vues FROM nikon
> WHERE qs_cs_s_cat='VIEW' GROUP BY qs_cs_s_aid;
> (...)
> OK
> NULL 2
> 1627575 25
> 1627576 70
> 1690950 22
> 1690952 42
> 1696705 199
> 1696706 66
> 1696730 229
> 1696759 85
> 1696893 218
> Time taken: 39.607 seconds
>
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