Jürgen Thomann created HIVE-13531:
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Summary: Cache in json_tuple UDF grows larger than it should
Key: HIVE-13531
URL: https://issues.apache.org/jira/browse/HIVE-13531
Project: Hive
Issue Type: Bug
Components: UDF
Affects Versions: 1.1.0
Environment: CDH 5.5.0 with Java 1.8.0_45
Reporter: Jürgen Thomann
Assignee: Jason Dere
Priority: Minor
According to the code in
ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDTFJSONTuple.java the
HashCache should never grow larger than 16 entries. In the last OOM of Hive
Server 2 I found this HashCache with over 1 million
java.util.LinkedHashMap$Entry objects.
The code looks right and works single threaded as it should when I tested it
isolated. The only problem I can imagine with my limited Hive source code
knowledge that it is accessed concurrently and somewhere the cleanup with
removeEldestEntry is not working in that case.
I had this problem with Hive 1.1.0 but the current implementation in master
looks the same for the HashCache.
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