Jinhang Choi created TAJO-1075:
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Summary: unexpected join output from input of consecutive query
results including 0-size tuple segment
Key: TAJO-1075
URL: https://issues.apache.org/jira/browse/TAJO-1075
Project: Tajo
Issue Type: Bug
Affects Versions: 0.9.0
Environment: 9 HDFS Data Node (Tajo 1 Master + 8 Workers), OpenJDK 1.7
Reporter: Jinhang Choi
Tajo generates unexpected join output with some input made by consecutive query
execution including 0-size tuple segments. For example,
0.
external table t: 1.1GB data near 24M rows
1.
tajo query 1> create table t1 as select * from t where t.a=xxx;
tajo query 1a> create table t1_ext as select t1.*, u.b from t1 inner join u on
t1.key=u.key;
tajo query 2> create table t2 as select * from t where t.a=yyy;
tajo query 2a> create table t2_ext as select t2.*, u.b from t2 inner join u on
t2.key=u.key;
Table t1_ext and t2_ext are flawless (tajo succeeded in executing queries). The
last output from a series of query executions has 3MB data near 64K rows in
hdfs, as following:
Permission Owner Group Size Replication Block Size Name
-rw-r--r-- hadoop supergroup 0 B 2 32 MB
part-03-000000-000
-rw-r--r-- hadoop supergroup 0 B 2 32 MB
part-03-000001-000
-rw-r--r-- hadoop supergroup 0 B 2 32 MB
part-03-000002-000
-rw-r--r-- hadoop supergroup 0 B 2 32 MB
part-03-000003-000
-rw-r--r-- hadoop supergroup 0 B 2 32 MB
part-03-000004-000
-rw-r--r-- hadoop supergroup 0 B 2 32 MB
part-03-000005-000
-rw-r--r-- hadoop supergroup 0 B 2 32 MB
part-03-000006-000
-rw-r--r-- hadoop supergroup 1.03 MB 2 32 MB
part-03-000007-000
-rw-r--r-- hadoop supergroup 1.92 MB 2 32 MB
part-03-000008-000
2.
tajo query 3> select * from t1_ext inner join t2_ext on t1_ext.key=t2_ext.key;
the join query result produces abnormal output, for example, having nothing
regardless of the existence of matching key.
3.
after receiving some advices from [~jihoonson], I manually removed 0-size tuple
data in hdfs directory, and re-executed tajo query 3. The result indicates that
TAJO WORKS PROPERLY.
Since not explored tajo source in depth, I can pinpoint nowhere to modify. It
needs committer's support.
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