James, When using JDBC persistence I am seeing that the messages are stored in memory even after being persisted in database. They are not getting removed and this is resulting in outofmemory error. If I am not wrong, in case of JDBCpersistence adapter the messages will not be kept in memory after being written to the db ?
Pradeep James.Strachan wrote: > > Incidentally you could disable the journal if you have limited RAM and > are happy to trade performance for lower RAM usage... > > use <jdbcPersistenceAdapter/> instead in your XML like this example > > http://incubator.apache.org/activemq/jdbc-master-slave.html > > its much slower but doesn't require messages to be kept in RAM until a > checkpoint. > > > On 8/24/06, James Strachan <[EMAIL PROTECTED]> wrote: >> Are you sure you are definitely setting the Java heap size? e.g. its >> usually -Xmx1000m not -xmx etc. If you watch the broker in JMX do you >> see it using up 1Gb of RAM when you only have a 100Mb usage manager >> setting? >> >> Note that ActiveMQ uses a high performance journal so that messages >> are only evicted from RAM when a checkpoint to JDBC occurs, not the >> exact second that a message is consumed. >> >> So you are sending 1000 messages to 5 topics of 100K. So thats about >> 500Mb of messages. So I'd try set your memoryManager to be 800mb and >> your Java heap to be about 2000M and that should work - use JMX to see >> how much memory its using and how many messages get sent to the >> queues. >> >> >> On 8/24/06, pradeep <[EMAIL PROTECTED]> wrote: >> > >> > Thanks James. >> > I am using 4.0.1. I tried lowering the memory to 100MB. It did not >> work. >> > I increased the size to 400 MB, 800mb etc. >> > >> > It still gives me >> > Exception in thread "ActiveMQ Transport: tcp:///127.0.0.1:3116" >> > java.lang.OutOfMemoryError: Java heap space >> > >> > Why doesn't ActiveMQ remove the messages from memory when it has >> already >> > persisted messages into database. I am seeing the memory problem in >> > ActiveMQ and not other JMS server that I am evaluating. >> > James, can you please help me here. >> > >> > Pradeep >> > >> > >> > James.Strachan wrote: >> > > >> > > FWIW if you use ActiveMQ 4.1 you can configure the memory limit via >> > > >> > > <usageManager limitMb="100"/> >> > > >> > > On 8/23/06, James Strachan <[EMAIL PROTECTED]> wrote: >> > >> That memory limit looks a bit big; its about 7Gb I'd maybe set it to >> > >> be around 100Mb insteead >> > >> >> > >> On 8/23/06, pradeep <[EMAIL PROTECTED]> wrote: >> > >> > >> > >> > 1. Created a durable subsriber for 5 different topics and >> disonnected >> > >> the >> > >> > clients >> > >> > 2. Tried to send 1000 messages to each topic (message size =100kb) >> in >> > >> > parallel >> > >> > 5 threads were created each sending messages to different >> topics >> > >> > (Separate connection Factory lookup and topic lookup) >> > >> > I got this error this >> > >> > >> > >> > INFO Service - Sync error occurred: >> > >> > java.lang.OutOfMemoryError: Java heap space >> > >> > java.lang.OutOfMemoryError: Java heap space >> > >> > >> > >> > WARN JournalMessageStore - Message could not be added >> to >> > >> long >> > >> > term store: Java heap space >> > >> > java.lang.OutOfMemoryError: Java heap space >> > >> > >> > >> > >> > >> > I am running the activemq with -xms 256m -xmx1000m. >> > >> > activemq.xml has >> > >> > <memoryManager> >> > >> > <usageManager id="memory-manager" limit="8048576000"/> >> > >> > </memoryManager> >> > >> > >> > >> > Why is the error coming ? >> > >> > -- >> > >> > View this message in context: >> > >> >> http://www.nabble.com/INFO--Service--------------------------Sync-error-occurred%3A-java.lang.Ou-tf2152180.html#a5943593 >> > >> > Sent from the ActiveMQ - User forum at Nabble.com. >> > >> > >> > >> > >> > >> >> > >> >> > >> -- >> > >> >> > >> James >> > >> ------- >> > >> http://radio.weblogs.com/0112098/ >> > >> >> > > >> > > >> > > -- >> > > >> > > James >> > > ------- >> > > http://radio.weblogs.com/0112098/ >> > > >> > > >> > >> > -- >> > View this message in context: >> http://www.nabble.com/INFO--Service--------------------------Sync-error-occurred%3A-java.lang.Ou-tf2152180.html#a5959137 >> > Sent from the ActiveMQ - User forum at Nabble.com. >> > >> > >> >> >> -- >> >> James >> ------- >> http://radio.weblogs.com/0112098/ >> > > > -- > > James > ------- > http://radio.weblogs.com/0112098/ > > -- View this message in context: http://www.nabble.com/INFO--Service--------------------------Sync-error-occurred%3A-java.lang.Ou-tf2152180.html#a5960761 Sent from the ActiveMQ - User forum at Nabble.com.
