Any idea ? Thanks
2014-09-06 13:43 GMT+02:00 Jose María Zaragoza <demablo...@gmail.com>: > > Hi: > > I'm using AMQ 5.10.0 and I'm trying to understand some behaviour about > destination memory limits > and how messages are managed in queues by AMQ > > I've defined a persistent broker ( kahaDB ) with > > <policyEntry queue=">" optimizedDispatch="true" > producerFlowControl="true" memoryLimit="100 mb"/> > > and > > <storeUsage> > <storeUsage limit="500 mb"/> > </storeUsage> > > My test tries to send 2000 messages (1MB). They are persistent messages. > And *there isn't any consumer reading messages-* > The result is that in the 249th ( it's not a fixed number after several > tests), control flow is activated > > 2014-09-06 13:19:11,246 | INFO | Usage Manager Memory Limit (104857600) > reached on queue://foo.bar, size 249. Producers will be throttled to the > rate at which messages are removed from this destination to prevent > flooding it. > > My questions are: > > - why does AMQ need 100MB in memory to manage persistent messages ? There > isn't any consumer , so all messages should be stored into disk ( up to > storeUsage limit, ie, 500MB) > > - if the test sends non persistent messages, when the 100th message is > sent, temporary store is activated ( up to tempUsage limit ) > Why are the non persistent messages swapped to disk and memoryLimit looks > not be a problem if there is disk space enough, but persistent messages > require memory despite there is disk space enough? > > Thanks and regards > >
