[GitHub] [geode] jvarenina commented on pull request #7378: GEODE-10056: Improving gateway-reciever load balancing

[GitBox <gi...@apache.org>]

jvarenina commented on pull request #7378:
URL: https://github.com/apache/geode/pull/7378#issuecomment-1048513322


   Hi reviewers,
   
   With this solution each server will now send CacheServerLoadMessage containing the correct connection load of the gateway-receives to all locators in cluster. This will happen every 5 seconds as configured with load-poll-interval parameter. Additionally, coordinator locator will on its own increase the load each time it provides the server location to remote gateway-sender in ClientConnectionRequest/ClientConnectionResponse. Locator only maintains load temporarily until CacheServerLoadMessage is received. This makes sense as the load that server tracks is more accurate than the load tracked by locator. Locator only increase load based on the received connection requests while server adjusts the load each time connection is actually established and disconnected.
   
   When server/gateway-sender is starting up then usually ClientConnectionRequest are sent to coordinator (locator) in bursts. This will result with the load on locator that is way ahead of the server load, because servers did not established those connections yet. If during these bursts CacheServerLoadMessage message come to locator carrying low load value for one of the gateway-receivers, then that receiver will be picked more frequently (will have lowest load), and that could result with unbalanced gateway-sender connections. In order for this to have a big impact on load-balancing of sender connections the gateway-receivers must be started with some small delay, so that CacheServerLoadMessages are sent with some delay that is enough to cause imbalance. If CacheServerLoadMessages were sent at the similar time then this would not be a problem as all messages would have similar load and would update locator at similar time.
   
   I would be really grateful if you could share your opinion on this matter? 


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