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From Imesh Gunaratne <>
Subject Re: [Discuss] MB Fail Over Handling - Adding a Ping Topic Consumer in 4.0.0 release
Date Wed, 28 May 2014 04:52:41 GMT

Please find my comments in-line:

> - We got to have a health check mechanism. May be with low frequency if
> what nirmal claims is true.
Yes we could make the frequency configurable.

> - What prevent us from publish/subscribe both in the health checker..
With the current implementation we have not added a health checker to
publisher as it detects a connection drop at the time it tries to publish a

> - I am not convinced about having consumer in SM.
The problem here is there could be N number of subscribers for a given
topic. Each subscriber has a health checker and each sends ping messages to
the ping topic (may be we could call this "keepalive").

So if we introduce a ping message consumer it will receive all the ping
messages sent by N subscribers. Now the question is, are we going to
introduce a ping message consumer for each health checker instance or are
we going to have one ping message consumer in a Stratos component?

> - health check should be independent of other system components.
> Thanks

Imesh Gunaratne

Technical Lead, WSO2
Committer & PPMC Member, Apache Stratos

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