tree fc6e867cafdcb2c96a16bbaf2d36e1dd69da684d
parent 8e628faeb2c1d2a1dade06ad39629f8269e70d81
author Sergiy Matusevych <motus@apache.org> 1477977234 -0700
committer Markus Weimer <weimer@apache.org> 1478045016 -0700

[REEF-1654] Implement graceful shutdown of Wake executor services

This is work towards "REEF as a library" project
[REEF-1561](https://issues.apache.org/jira/browse/REEF-1561)

Summary of changes:
  * Catch the `InterruptedException` in `ThreadPoolStage` and make sure its
    `.close()` method never throws
  * Gracefully shutdown threads in `NettyMessagingTransport.close()`
  * Catch errors when closing the acceptor channel in `NettyMessagingTransport`
  * Make shure `NettyMessagingTransport.close()` never throws
  * Improve logging in `.close()` methods of `NettyMessagingTransport` and
    `ThreadPoolStage`
  * Minor refactoring for readability

JIRA:
  [REEF-1654](https://issues.apache.org/jira/browse/REEF-1654)

Pull Request:
  This closes #1174