László Végh created HIVE-26903:
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Summary: Compactor threads should gracefully shutdown
Key: HIVE-26903
URL: https://issues.apache.org/jira/browse/HIVE-26903
Project: Hive
Issue Type: Improvement
Reporter: László Végh
Currently the compactor threads are daemon threads, which means the JVM will
not wait for these threads to finish. (see:
[https://github.com/apache/hive/blob/431e7d9e5431a808106d8db81e11aea74f040da5/ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/CompactorThread.java#L81)]
As a result during system shutdown, JVM may close all daemon threads abruptly
(JVM won't wait for a thread to sleep/wait, and no InterruptedException is
thrown), so the threads don't have any chance to shutdown gracefully. This can
lead to inconsistent/corrupted state in the Metastore or on the File system.
Make the compactor threads user threads, and handle shutdown accordingly. Make
sure interrupts and InterruptedException is handled accordingly.
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