[jira] [Created] (MESOS-1453) Update reconciliation semantics to take only task ids and send statuses for each task.

["Benjamin Mahler (JIRA)" <ji...@apache.org>]

Benjamin Mahler created MESOS-1453:
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             Summary: Update reconciliation semantics to take only task ids and send statuses for each task.
                 Key: MESOS-1453
                 URL: https://issues.apache.org/jira/browse/MESOS-1453
             Project: Mesos
          Issue Type: Improvement
    Affects Versions: 0.19.0
            Reporter: Benjamin Mahler
             Fix For: 0.20.0


Currently, we only reply to a reconciliation request when the task state differs. This makes it difficult for a framework to implement reconciliation: if the framework does not receive an update for the task, it cannot determine if this was because the state is valid, or the slave was transitioning, or the master has not recovered yet.

As a consequence of this, frameworks looking to reconcile tasks need to continually retry at small intervals to compensate for the lack of ability to differentiate the cases listed above.

A solution to this problem is update the reconciliation API to instead just send the task ids to be reconciled, and the master will send an update for all of the tasks, if possible. This means we no longer compare task states to determine when to send an update.



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