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https://issues.apache.org/jira/browse/HIVE-10880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14652398#comment-14652398
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Yongzhi Chen commented on HIVE-10880:
-------------------------------------
The patch is fixing following issue:
In local mode and when enforce.bucketing is true, for bucket table, insert
overwrite to table or static partition, bucket number is not respected.
Because only dynamic partition works fine, this fix uses the same idea as how
to handle the dynamic partition scenario.
Attach patch 4 after rebase.
> The bucket number is not respected in insert overwrite.
> -------------------------------------------------------
>
> Key: HIVE-10880
> URL: https://issues.apache.org/jira/browse/HIVE-10880
> Project: Hive
> Issue Type: Bug
> Affects Versions: 1.2.0
> Reporter: Yongzhi Chen
> Assignee: Yongzhi Chen
> Priority: Critical
> Attachments: HIVE-10880.1.patch, HIVE-10880.2.patch,
> HIVE-10880.3.patch
>
>
> When hive.enforce.bucketing is true, the bucket number defined in the table
> is no longer respected in current master and 1.2.
> Reproduce:
> {code:sql}
> CREATE TABLE IF NOT EXISTS buckettestinput(
> data string
> )
> ROW FORMAT DELIMITED FIELDS TERMINATED BY ',';
> 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 ',';
> {code}
> Then I inserted the following data into the "buckettestinput" table:
> {noformat}
> firstinsert1
> firstinsert2
> firstinsert3
> firstinsert4
> firstinsert5
> firstinsert6
> firstinsert7
> firstinsert8
> secondinsert1
> secondinsert2
> secondinsert3
> secondinsert4
> secondinsert5
> secondinsert6
> secondinsert7
> secondinsert8
> {noformat}
> {code:sql}
> set hive.enforce.bucketing = true;
> set hive.enforce.sorting=true;
> insert overwrite table buckettestoutput1
> select * from buckettestinput where data like 'first%';
> set hive.auto.convert.sortmerge.join=true;
> set hive.optimize.bucketmapjoin = true;
> set hive.optimize.bucketmapjoin.sortedmerge = true;
> select * from buckettestoutput1 a join buckettestoutput2 b on (a.data=b.data);
> {code}
> {noformat}
> 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 1
> (state=42000,code=10141)
> {noformat}
> The related debug information related to insert overwrite:
> {noformat}
> 0: jdbc:hive2://localhost:10000> insert overwrite table buckettestoutput1
> select * from buckettestinput where data like 'first%'insert overwrite table
> buckettestoutput1
> 0: jdbc:hive2://localhost:10000> ;
> select * from buckettestinput where data like '
> first%';
> INFO : Number of reduce tasks determined at compile time: 2
> INFO : In order to change the average load for a reducer (in bytes):
> INFO : set hive.exec.reducers.bytes.per.reducer=<number>
> INFO : In order to limit the maximum number of reducers:
> INFO : set hive.exec.reducers.max=<number>
> INFO : In order to set a constant number of reducers:
> INFO : set mapred.reduce.tasks=<number>
> INFO : Job running in-process (local Hadoop)
> INFO : 2015-06-01 11:09:29,650 Stage-1 map = 86%, reduce = 100%
> INFO : Ended Job = job_local107155352_0001
> INFO : Loading data to table default.buckettestoutput1 from
> file:/user/hive/warehouse/buckettestoutput1/.hive-staging_hive_2015-06-01_11-09-28_166_3109203968904090801-1/-ext-10000
> INFO : Table default.buckettestoutput1 stats: [numFiles=1, numRows=4,
> totalSize=52, rawDataSize=48]
> No rows affected (1.692 seconds)
> {noformat}
> Insert use dynamic partition does not have the issue.
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