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From Reka Thirunavukkarasu <>
Subject Executing cluster monitor periodically as well as on demand
Date Sun, 14 Dec 2014 04:37:47 GMT
Hi All,

As we now support adding cluster instances dynamically, we will have to
wait for next one minute to get the members started in that particular
cluster instance which will delay other dependencies startup when it comes
to scaling or terminate and start again. Also, after adding the members in
obsolete member list when terminating a cluster, we will again have to wait
for one minute to get the members terminated. This will delay the action
based on the termination specially when it comes to terminate-dependent or
terminate-all scenarios.

Can we do $subject by introducing locking support for the cluster monitor?
So that whenever needed, we can directly execute the cluster monitor by
taking lock to take decision only for min check and obsolete check. Let
Cluster monitor periodically execute to take decision like min check,
obsolete check and scaling. Because, AFAIK for scaling we will have to wait
minimum one minute to get all the latest stats.


Reka Thirunavukkarasu
Senior Software Engineer,
WSO2, Inc.:,
Mobile: +94776442007

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