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From "Neil Conway (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MESOS-3977) http::_operation() creates unnecessary filter, rescinds unnecessarily
Date Wed, 02 Dec 2015 20:54:11 GMT

     [ https://issues.apache.org/jira/browse/MESOS-3977?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Neil Conway updated MESOS-3977:
-------------------------------
    Description: 
This function is used by the /reserve, /unreserve, /create-volumes, and /destroy-volumes 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.

  was:
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.


> 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
>              Labels: mesosphere, reservations
>
> This function is used by the /reserve, /unreserve, /create-volumes, and /destroy-volumes
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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