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From Shobhana <shobh...@quickride.in>
Subject Re: ActiveMQ with KahaDB as persistent store becomes very slow (almost unresponsive) after creating large no (25000+) of Topics
Date Tue, 29 Mar 2016 04:17:08 GMT
I enabled debug logs to see what was happening when AMQ could not send ACK
within 30 secs. I started the AMQ broker on 28-Mar around 17:40 and to my
surprise, I find that the server startup is still going on even now at
29-Mar 09:30 (~16 hours!!). I see a lot of following messages in the logs :

2016-03-28 18:36:25,340 | DEBUG | PrimaryBroker adding destination:
topic://33ConcurrentTopicCreator410 |
org.apache.activemq.broker.region.AbstractRegion | main
2016-03-28 18:36:25,347 | DEBUG | Restoring durable subscription:
SubscriptionInfo {subscribedDestination =
topic://33ConcurrentTopicCreator410, destination =
topic://33ConcurrentTopicCreator410, clientId = 3ConcurrentTopicCreator,
subscriptionName = AT_LEAST_ONCE:33ConcurrentTopicCreator410, selector =
null, noLocal = false} | org.apache.activemq.broker.region.TopicRegion |
main
2016-03-28 18:36:25,350 | DEBUG | PrimaryBroker adding destination:
topic://33ConcurrentTopicCreator409 |
org.apache.activemq.broker.region.AbstractRegion | main
2016-03-28 18:36:25,357 | DEBUG | Restoring durable subscription:
SubscriptionInfo {subscribedDestination =
topic://33ConcurrentTopicCreator409, destination =
topic://33ConcurrentTopicCreator409, clientId = 3ConcurrentTopicCreator,
subscriptionName = AT_LEAST_ONCE:33ConcurrentTopicCreator409, selector =
null, noLocal = false} | org.apache.activemq.broker.region.TopicRegion |
main
2016-03-28 18:36:25,360 | DEBUG | PrimaryBroker adding destination:
topic://33ConcurrentTopicCreator408 |
org.apache.activemq.broker.region.AbstractRegion | main
2016-03-28 18:36:25,367 | DEBUG | Restoring durable subscription:
SubscriptionInfo {subscribedDestination =
topic://33ConcurrentTopicCreator408, destination =
topic://33ConcurrentTopicCreator408, clientId = 3ConcurrentTopicCreator,
subscriptionName = AT_LEAST_ONCE:33ConcurrentTopicCreator408, selector =
null, noLocal = false} | org.apache.activemq.broker.region.TopicRegion |
main
2016-03-28 18:36:25,370 | DEBUG | PrimaryBroker adding destination:
topic://33ConcurrentTopicCreator403 |
org.apache.activemq.broker.region.AbstractRegion | main
2016-03-28 18:36:25,377 | DEBUG | Restoring durable subscription:
SubscriptionInfo {subscribedDestination =
topic://33ConcurrentTopicCreator403, destination =
topic://33ConcurrentTopicCreator403, clientId = 3ConcurrentTopicCreator,
subscriptionName = AT_LEAST_ONCE:33ConcurrentTopicCreator403, selector =
null, noLocal = false} | org.apache.activemq.broker.region.TopicRegion |
main
2016-03-28 18:36:25,380 | DEBUG | PrimaryBroker adding destination:
topic://33ConcurrentTopicCreator402 |
org.apache.activemq.broker.region.AbstractRegion | main
2016-03-28 18:36:25,387 | DEBUG | Restoring durable subscription:
SubscriptionInfo {subscribedDestination =
topic://33ConcurrentTopicCreator402, destination =
topic://33ConcurrentTopicCreator402, clientId = 3ConcurrentTopicCreator,
subscriptionName = AT_LEAST_ONCE:33ConcurrentTopicCreator402, selector =
null, noLocal = false} | org.apache.activemq.broker.region.TopicRegion |
main

There are 89000+ instances of "PrimaryBroker adding destination:" and
"Restoring durable subscription:"

If I enable only INFO log level, broker starts up within a few minutes, but
if DEBUG is enabled, why does it take so long? Will writing debug message to
the log take so much more time?





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