Aditya Shah created HIVE-20456:
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Summary: 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
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:
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;
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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