[jira] [Commented] (AURORA-1911) HTTP Scheduler Driver does not reliably re subscribe

["Zameer Manji (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AURORA-1911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15948114#comment-15948114 ] 

Zameer Manji commented on AURORA-1911:
--------------------------------------

First part here: https://reviews.apache.org/r/58053/

> HTTP Scheduler Driver does not reliably re subscribe
> ----------------------------------------------------
>
>                 Key: AURORA-1911
>                 URL: https://issues.apache.org/jira/browse/AURORA-1911
>             Project: Aurora
>          Issue Type: Bug
>            Reporter: Zameer Manji
>            Assignee: Zameer Manji
>
> I observed this issue in a large production cluster during a period of Mesos Master instability:
> 1. Mesos master crashes or restarts.
> 2. {{V1Mesos}} driver detects this and reconnects.
> 3. Aurora does the {{SUBSCRIBE}} call again.
> 4. The {{SUBSCRIBE}} Call fails silently in the driver.
> 5. All future calls are silently dropped by the driver.
> 6. Aurora has no offers because it is not subscribed.
> Logs:
> {noformat}
> I0328 19:40:55.473546 101404 scheduler.cpp:353] Connected with the master at http://10.162.14.30:5050/master/api/v1/scheduler
> W0328 19:40:55.475898 101410 scheduler.cpp:583] Received '503 Service Unavailable' () for SUBSCRIBE
> ....
> W0328 19:40:58.862393 101398 scheduler.cpp:508] Dropping KILL: Scheduler is in state CONNECTED
> ....
> W0328 19:41:14.588474 101394 scheduler.cpp:508] Dropping KILL: Scheduler is in state CONNECTED
> ....
> W0328 19:41:37.763464 101402 scheduler.cpp:508] Dropping KILL: Scheduler is in state CONNECTED
> ...
> {noformat}
> To fix this, the {{VersionedSchedulerDriver}} needs to do two things:
> 1. Block calls when unsubscribed not just disconnected.
> 2. Retry the {{SUBSCRIBE}} call repeatedly with exponential backoff.



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