[jira] [Created] (MESOS-3977) http::_operation() creates unnecessary filter, rescinds unnecessarily

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

Neil Conway created MESOS-3977:
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             Summary: http::_operation() creates unnecessary filter, rescinds unnecessarily
                 Key: MESOS-3977
                 URL: https://issues.apache.org/jira/browse/MESOS-3977
             Project: Mesos
          Issue Type: Bug
            Reporter: Neil Conway
            Priority: Minor


This function is used by the /reserve, /unreserve, /create-volume, and /destroy-volume endpoints. It has a few worts:

1. It installs a 5-second filter when rescinding an offer. However, the cluster state might change so that the filter is actually undesirable. For example, this scenario:
* Create DR, make offer
* Create PV => rescinds previous offer, sets filter, makes offer
* Destroy PV => rescinds previous offer
After the last step, we'll wait 5 seconds for the filter to expire before re-offering the DR.

2. If there are sufficient available resources at the target slave, we don't actually need to rescind any offers in the first place. However, _operation() rescinds offers unconditionally.



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