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https://issues.apache.org/jira/browse/HIVE-10866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Yongzhi Chen updated HIVE-10866:
--------------------------------
Description:
Currently, hive does not support appends(insert into) bucketed table, see open
jira HIVE-3608. When insert into such table, the data will be "corrupted" and
not fit for sort merge bucket mapjoin.
We need find a way to prevent client from inserting into such table. Or at
least give a warning.
Reproduce:
{noformat}
CREATE TABLE IF NOT EXISTS buckettestoutput1(
data string
)CLUSTERED BY(data)
INTO 2 BUCKETS
ROW FORMAT DELIMITED FIELDS TERMINATED BY ',';
CREATE TABLE IF NOT EXISTS buckettestoutput2(
data string
)CLUSTERED BY(data)
INTO 2 BUCKETS
ROW FORMAT DELIMITED FIELDS TERMINATED BY ',';
set hive.enforce.bucketing = true;
set hive.enforce.sorting=true;
insert into table buckettestoutput1 select code from sample_07 where total_emp
< 134354250 limit 10;
After this first insert, I did:
set hive.auto.convert.sortmerge.join=true;
set hive.optimize.bucketmapjoin = true;
set hive.optimize.bucketmapjoin.sortedmerge = true;
set hive.auto.convert.sortmerge.join.noconditionaltask=true;
0: jdbc:hive2://localhost:10000> select * from buckettestoutput1 a join
buckettestoutput2 b on (a.data=b.data);
+-------+-------+
| data | data |
+-------+-------+
+-------+-------+
So select works fine.
Second insert:
0: jdbc:hive2://localhost:10000> insert into table buckettestoutput1 select
code from sample_07 where total_emp >= 134354250 limit 10;
No rows affected (61.235 seconds)
Then select:
0: jdbc:hive2://localhost:10000> select * from buckettestoutput1 a join
buckettestoutput2 b on (a.data=b.data);
Error: Error while compiling statement: FAILED: SemanticException [Error
10141]: Bucketed table metadata is not correct. Fix the metadata or don't use
bucketed mapjoin, by setting hive.enforce.bucketmapjoin to false. The number of
buckets for table buckettestoutput1 is 2, whereas the number of files is 4
(state=42000,code=10141)
0: jdbc:hive2://localhost:10000>
{noformat}
Insert into empty table or partition will be fine, but insert into the
non-empty one (after second insert in the reproduce), the bucketmapjoin will
throw an error. We should not let second insert succeed.
was:
Currently, hive does not support appends(insert into) bucketed table, see open
jira HIVE-3608. When insert into such table, the data will be "corrupted" and
not fit for bucketmapjoin with sortmerge.
We need find a way to prevent client from inserting into such table. Or at
least give a warning.
Reproduce:
{noformat}
CREATE TABLE IF NOT EXISTS buckettestoutput1(
data string
)CLUSTERED BY(data)
INTO 2 BUCKETS
ROW FORMAT DELIMITED FIELDS TERMINATED BY ',';
CREATE TABLE IF NOT EXISTS buckettestoutput2(
data string
)CLUSTERED BY(data)
INTO 2 BUCKETS
ROW FORMAT DELIMITED FIELDS TERMINATED BY ',';
set hive.enforce.bucketing = true;
set hive.enforce.sorting=true;
insert into table buckettestoutput1 select code from sample_07 where total_emp
< 134354250 limit 10;
After this first insert, I did:
set hive.auto.convert.sortmerge.join=true;
set hive.optimize.bucketmapjoin = true;
set hive.optimize.bucketmapjoin.sortedmerge = true;
set hive.auto.convert.sortmerge.join.noconditionaltask=true;
0: jdbc:hive2://localhost:10000> select * from buckettestoutput1 a join
buckettestoutput2 b on (a.data=b.data);
+-------+-------+
| data | data |
+-------+-------+
+-------+-------+
So select works fine.
Second insert:
0: jdbc:hive2://localhost:10000> insert into table buckettestoutput1 select
code from sample_07 where total_emp >= 134354250 limit 10;
No rows affected (61.235 seconds)
Then select:
0: jdbc:hive2://localhost:10000> select * from buckettestoutput1 a join
buckettestoutput2 b on (a.data=b.data);
Error: Error while compiling statement: FAILED: SemanticException [Error
10141]: Bucketed table metadata is not correct. Fix the metadata or don't use
bucketed mapjoin, by setting hive.enforce.bucketmapjoin to false. The number of
buckets for table buckettestoutput1 is 2, whereas the number of files is 4
(state=42000,code=10141)
0: jdbc:hive2://localhost:10000>
{noformat}
Insert into empty table or partition will be fine, but insert into the
non-empty one (after second insert in the reproduce), the bucketmapjoin will
throw an error. We should not let second insert succeed.
> Give a warning when client try to insert into bucketed table
> ------------------------------------------------------------
>
> Key: HIVE-10866
> URL: https://issues.apache.org/jira/browse/HIVE-10866
> Project: Hive
> Issue Type: Improvement
> Affects Versions: 1.2.0, 1.3.0
> Reporter: Yongzhi Chen
> Assignee: Yongzhi Chen
> Attachments: HIVE-10866.1.patch, HIVE-10866.2.patch
>
>
> Currently, hive does not support appends(insert into) bucketed table, see
> open jira HIVE-3608. When insert into such table, the data will be
> "corrupted" and not fit for sort merge bucket mapjoin.
> We need find a way to prevent client from inserting into such table. Or at
> least give a warning.
> Reproduce:
> {noformat}
> CREATE TABLE IF NOT EXISTS buckettestoutput1(
> data string
> )CLUSTERED BY(data)
> INTO 2 BUCKETS
> ROW FORMAT DELIMITED FIELDS TERMINATED BY ',';
> CREATE TABLE IF NOT EXISTS buckettestoutput2(
> data string
> )CLUSTERED BY(data)
> INTO 2 BUCKETS
> ROW FORMAT DELIMITED FIELDS TERMINATED BY ',';
> set hive.enforce.bucketing = true;
> set hive.enforce.sorting=true;
> insert into table buckettestoutput1 select code from sample_07 where
> total_emp < 134354250 limit 10;
> After this first insert, I did:
> set hive.auto.convert.sortmerge.join=true;
> set hive.optimize.bucketmapjoin = true;
> set hive.optimize.bucketmapjoin.sortedmerge = true;
> set hive.auto.convert.sortmerge.join.noconditionaltask=true;
> 0: jdbc:hive2://localhost:10000> select * from buckettestoutput1 a join
> buckettestoutput2 b on (a.data=b.data);
> +-------+-------+
> | data | data |
> +-------+-------+
> +-------+-------+
> So select works fine.
> Second insert:
> 0: jdbc:hive2://localhost:10000> insert into table buckettestoutput1 select
> code from sample_07 where total_emp >= 134354250 limit 10;
> No rows affected (61.235 seconds)
> Then select:
> 0: jdbc:hive2://localhost:10000> select * from buckettestoutput1 a join
> buckettestoutput2 b on (a.data=b.data);
> Error: Error while compiling statement: FAILED: SemanticException [Error
> 10141]: Bucketed table metadata is not correct. Fix the metadata or don't use
> bucketed mapjoin, by setting hive.enforce.bucketmapjoin to false. The number
> of buckets for table buckettestoutput1 is 2, whereas the number of files is 4
> (state=42000,code=10141)
> 0: jdbc:hive2://localhost:10000>
> {noformat}
> Insert into empty table or partition will be fine, but insert into the
> non-empty one (after second insert in the reproduce), the bucketmapjoin will
> throw an error. We should not let second insert succeed.
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