Illya Yalovyy created HIVE-11583:
------------------------------------
Summary: When PTF is used over a large partitions result could be
corrupted
Key: HIVE-11583
URL: https://issues.apache.org/jira/browse/HIVE-11583
Project: Hive
Issue Type: Bug
Components: PTF-Windowing
Affects Versions: 1.2.1, 1.2.0, 1.0.0, 0.13.1, 0.14.0, 0.14.1
Environment: Hadoop 2.6 + Apache hive built from trunk
Reporter: Illya Yalovyy
Priority: Critical
Dataset:
Window has 50001 record (2 blocks on disk and 1 block in memory)
Size of the second block is >32Mb (2 splits)
Result:
When the last block is read from the disk only first split is actually loaded.
The second split gets missed. The total count of the result dataset is correct,
but some records are missing and another are duplicated.
Example:
{code:sql}
CREATE TABLE ptf_big_src (
id INT,
key STRING,
grp STRING,
value STRING
) ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t';
LOAD DATA LOCAL INPATH '../../data/files/ptf_3blocks.txt.gz' OVERWRITE INTO
TABLE ptf_big_src;
SELECT grp, COUNT(1) cnt FROM ptf_big_trg GROUP BY grp ORDER BY cnt desc;
---
-- A 25000
-- B 20000
-- C 5001
---
CREATE TABLE ptf_big_trg AS SELECT *, row_number() OVER (PARTITION BY key ORDER
BY grp) grp_num FROM ptf_big_src;
SELECT grp, COUNT(1) cnt FROM ptf_big_trg GROUP BY grp ORDER BY cnt desc;
--
-- A 34296
-- B 15704
-- C 1
---
{code}
Counts by 'grp' are incorrect!
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