Aled Sage created BROOKLYN-580:
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Summary: 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
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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