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https://issues.apache.org/jira/browse/HIVE-20456?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aditya Shah updated HIVE-20456:
-------------------------------
Attachment: HIVE-20456.patch
Status: Patch Available (was: Open)
> Query fails with FNFException using MR with skewjoin enabled and auto convert
> join disabled
> -------------------------------------------------------------------------------------------
>
> Key: HIVE-20456
> URL: https://issues.apache.org/jira/browse/HIVE-20456
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 3.1.0, 2.1.1, 1.2.0
> Reporter: Aditya Shah
> Assignee: Aditya Shah
> Priority: Major
> Attachments: HIVE-20456.patch
>
>
> When skew join is enabled and auto convert join is disabled the query fails
> with file not found exception. The following query reproduces the error:
>
> {code:java}
> set hive.optimize.skewjoin = true;
> set hive.auto.convert.join = false;
> set hive.groupby.orderby.position.alias = true;
> set hive.on.master=true;
> set hive.execution.engine=mr;
> drop database if exists test cascade;
> create database if not exists test;
> use test;
> CREATE EXTERNAL TABLE test_table1
> ( `a` int , `b` int, `c` int)
> PARTITIONED BY (
> `d` int)
> ROW FORMAT SERDE
> 'org.apache.hadoop.hive.ql.io.orc.OrcSerde'
> STORED AS INPUTFORMAT
> 'org.apache.hadoop.hive.ql.io.orc.OrcInputFormat'
> OUTPUTFORMAT
> 'org.apache.hadoop.hive.ql.io.orc.OrcOutputFormat'
> ;
> CREATE EXTERNAL TABLE test_table2
> ( `a` int , `b` int, `c` int)
> PARTITIONED BY (
> `d` int)
> ROW FORMAT SERDE
> 'org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe'
> STORED AS INPUTFORMAT
> 'org.apache.hadoop.mapred.TextInputFormat'
> OUTPUTFORMAT
> 'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat';
> CREATE EXTERNAL TABLE test_table3
> ( `a` int , `b` int, `c` int)
> PARTITIONED BY (
> `e` int)
> ROW FORMAT SERDE
> 'org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe'
> WITH SERDEPROPERTIES (
> 'field.delim'='\u0001',
> 'serialization.format'='\u0001')
> STORED AS INPUTFORMAT
> 'org.apache.hadoop.mapred.TextInputFormat'
> OUTPUTFORMAT
> 'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat';
> CREATE EXTERNAL TABLE test_table4 (`a` int , `b` int, `c` int)
> PARTITIONED BY (
> `e` string)
> ROW FORMAT SERDE
> 'org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe'
> WITH SERDEPROPERTIES (
> 'field.delim'='\u0001',
> 'serialization.format'='\u0001')
> STORED AS INPUTFORMAT
> 'org.apache.hadoop.mapred.TextInputFormat'
> OUTPUTFORMAT
> 'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat';
> with
> temp1 as (
> select
> g.a,
> n.b,
> u.c
> from
> test_table2 g
> inner join test_table4 u on g.a = u.a
> inner join test_table3 n on u.b = n.b
> ),
> temp2 as (
> select * from test_table4 where a = 2
> ),
> temp21 as (
> select
> g.b,
> n.c,
> u.a
> from
> temp2 g
> inner join test_table3 u on g.b = u.b
> inner join test_table2 n on u.c = n.c
> group by g.b, n.c, u.a
> ),
> stack as (
> select * from temp1
> union all
> select * from temp21
> )
> select * from stack;
> {code}
> The query runs perfectly fine when tez is used or other combinations of skew
> join and auto convert join are set. On diagnosing the issue, the problem was
> when a conditional task resolves tasks it puts the resolved task directly in
> the runnable state without checking the parental dependencies as well as
> whether the task is already queued.
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