[HIVE-23144] LLAP: Let QueryTracker cleanup on serviceStop

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0-alpha-1
• Component/s: llap
• Assignee: László Bodor
• Reporter: László Bodor
• Created: 06/Apr/20 17:18
• Updated: 17/Nov/22 08:51
• Resolved: 07/Apr/20 16:59

Description

QueryTracker's executor service basically runs cleanup tasks: ExternalQueryCleanerCallable, DagMapCleanerCallable, FileCleanerCallable. Changing the shutdown behavior to .shutdown() from .shutdownNow() would let QueryTracker to cleanup its garbage, for example shuffle local files:
https://github.com/apache/hive/blob/c3ec20dd4f5b5fbde4007041844f6aed8c262ca1/llap-server/src/java/org/apache/hadoop/hive/llap/daemon/impl/QueryTracker.java#L440