Revert
------
Key: HIVE-2211
URL: https://issues.apache.org/jira/browse/HIVE-2211
Project: Hive
Issue Type: Bug
Reporter: Siying Dong
Quick fix a bug caused by HIVE-243
HIVE-234 removed the codes to wait for the threads to finish and use
ThreadPoolExector.shutdown() to wait for the results. The usage of
ThreadPoolExecutor.shutdown(), however, is wrong. The codes assume that the
function blocks until all threads finish running but it actually only marks
status and won't block. It caused wrong result of Utilities.getInputSummary()
and caused many jobs are executed as local mode while they have huge data.
Revert those changes quickly. We can have a follow-up to see how to deal with
this more efficiently if you want.
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