[jira] [Created] (MESOS-5950) Consider request/response for reconciliation, bulk reconcile

["Neil Conway (JIRA)" <ji...@apache.org>]

Neil Conway created MESOS-5950:
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             Summary: Consider request/response for reconciliation, bulk reconcile
                 Key: MESOS-5950
                 URL: https://issues.apache.org/jira/browse/MESOS-5950
             Project: Mesos
          Issue Type: Improvement
          Components: framework api, master
            Reporter: Neil Conway


The current task reconciliation API has a few quirks:

1. The master will sometimes use "send nothing" as a way to communicate information (MESOS-4050), which is very confusing in a distributed system that might drop messages for other reasons.
2. A framework has no way to determine when the reconciliation results for a given reconciliation request are "complete". That is, when a framework sends a reconciliation request, it starts to receive zero or more task status updates (with {{reason}} set to {{REASON_RECONCILIATION}}). The framework can't easily determine how many results it should expect to receive.
3. For efficiency (and perhaps to simplify framework logic), it might be easier to send a batch of task status updates together in a single message, rather than sending potentially tens of thousands of individual messages.

For #2, arguably a framework shouldn't _need_ to know when it has seen the "complete" set of results for a reconciliation request. However, supporting a "request/reply" structure for reconciliation can simplify framework logic, especially if a framework might have multiple timers/reasons to be doing reconciliation at the same time.



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