[jira] [Updated] (MESOS-3990) Unexpected reservation results due to floating point error

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

     [ https://issues.apache.org/jira/browse/MESOS-3990?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Neil Conway updated MESOS-3990:
-------------------------------
         Labels: mesosphere reservations tech-debt  (was: )
       Priority: Major  (was: Critical)
    Component/s: master
        Summary: Unexpected reservation results due to floating point error  (was: Doubles Don't Work for Resource Reservation)

On reflection, reopening because this is a distinct issue: MESOS-3552 and MESOS-1187 are about a crashing bug, whereas this talks about unexpected user-visible behavior.

In the short-term, the workaround is for frameworks to compare reserved resources within an epsilon. Long-term fix is to switch to a fixed-point representation (MESOS-3997).

> Unexpected reservation results due to floating point error
> ----------------------------------------------------------
>
>                 Key: MESOS-3990
>                 URL: https://issues.apache.org/jira/browse/MESOS-3990
>             Project: Mesos
>          Issue Type: Bug
>          Components: master
>            Reporter: Gabriel Hartmann
>              Labels: mesosphere, reservations, tech-debt
>
> When issuing a RESERVE operation requesting the below, I received a reservation with the wrong value (6566.4002):
>   resources {
>     name: "mem"
>     type: SCALAR
>     scalar {
>       value: 6566.4001
>     }
>     role: "role1"
>     reservation {
>       principal: "default-principal"
>     }
>   }



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