[jira] [Created] (MESOS-892) Additional Issues with contender related change

["Yan Xu (JIRA)" <ji...@apache.org>]

Yan Xu created MESOS-892:
----------------------------

             Summary: Additional Issues with contender related change
                 Key: MESOS-892
                 URL: https://issues.apache.org/jira/browse/MESOS-892
             Project: Mesos
          Issue Type: Bug
            Reporter: Yan Xu
            Assignee: Yan Xu
             Fix For: 0.16.0


There are a few issues with the contender code in master, mostly with regard to semantic consistency of the APIs.

1. When the detectors (ZooKeeperMasterDetector, LeaderDetector) fail, subsequent detect() calls should get a Failure directly.
2. ZooKeeperMasterContenderProcess::master should be an option to codify the fact that it can be unset after construction.
3. ZooKeeperMasterContenderProcess::contend should check if the future for the previous contend() is still pending and if so it should directly return that future without recontending.
4. LeaderContender::withdraw() should alway return ‘false’ if there is no membership to withdraw.
5. GroupProcess::abort() should set all owned memberships as cancelled.



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