Review Request 71888: HIVE-22568: Process compaction candidates in parallel by the Initiator

[Denys Kuzmenko via Review Board]

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Review request for hive, Laszlo Pinter and Peter Vary.


Bugs: HIVE-22568
    https://issues.apache.org/jira/browse/HIVE-22568


Repository: hive-git


Description
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`checkForCompaction` includes many file metadata checks and may be expensive. 
Therefore, make sense using a thread pool here and running 
`checkForCompactions` in parallel.


Diffs
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  common/src/java/org/apache/hadoop/hive/conf/HiveConf.java 4393a2825e 
  ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/Initiator.java 7a0e32463d 
  ql/src/test/org/apache/hadoop/hive/ql/txn/compactor/TestInitiator.java 
564839324f 


Diff: https://reviews.apache.org/r/71888/diff/1/


Testing
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unit test


Thanks,

Denys Kuzmenko