Github user sudheeshkatkam commented on the issue:
https://github.com/apache/drill/pull/709
This change may not be that simple, but I could be wrong. I tried to do
something similar as part of [PR
429](https://github.com/apache/drill/pull/429/commits/0394f4caffff5aed142bb2ba0b192f3588cfda7b).
The close happens elsewhere. The "loop" is actually closed as part of
[BasicServer#close](https://github.com/apache/drill/blob/master/exec/rpc/src/main/java/org/apache/drill/exec/rpc/BasicServer.java#L218).
But it will be closed multiple times (because there may be multiple instances
of sub-classes of BasicServer, and all use the same loop), and looks like
"loop2" is not closed anywhere. The changes in PR 429 close the loops exactly
once, but I do not recollect why the PR is not merged.
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