ASF GitHub Bot commented on BROOKLYN-580:

Github user asfgit closed the pull request at:


> Rebinding to MachineEntity: sometimes fails to reconnect sensor feeds
> ---------------------------------------------------------------------
>                 Key: BROOKLYN-580
>                 URL: https://issues.apache.org/jira/browse/BROOKLYN-580
>             Project: Brooklyn
>          Issue Type: Bug
>    Affects Versions: 0.12.0
>            Reporter: Aled Sage
>            Priority: Major
> On rebind, sometimes \{{MachineEntity}} instances do not have their feeds 
> recreated. This is illustrated by non-deterministic test failure in 
> \{{MachineEntityJcloudsRebindTest}}.
> The problem is that \{{SoftwareProcessImpl.callRebindHooks}} schedules a task 
> to call \{{connectSensors}} in something between 0 and 10 seconds time, which 
> will try to recreate the feeds. However, if this executes too soon (while 
> rebind is still happening), the \{{SshMachineLocation}} may not yet be 
> managed. If that is the case, the feed is not created.
> This is most likely to happen if there are a lot of entities/locations, so 
> iterating over them for rebind takes longer. It is random in that the delay 
> in calling \{{connectSensors}} can sometimes be extremely short (the 
> randomness there is to avoid the thundering herd problem on rebind).
> Although the symptoms are similar to 
> https://issues.apache.org/jira/browse/BROOKLYN-425, the underlying cause is 
> different - therefore treating this as a new issue rather than reopening the 
> old one.

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