[rabbitmq-discuss] Problem with RabbitMQ Java Client (Memory leak)

[Steve Powell]

The fix (which we have coded) will be in the next release,
but I don't know precisely when that will be.

Steve Powell  (a happy bunny)
----------some more definitions from the SPD----------
vermin (v.) Treating the dachshund for roundworm.
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On 1 Feb 2012, at 11:21, Yogesh Ketkar wrote:

> Thanks Steve.
> Can you give me some idea about date of next Java Client release (with
> this bug-fix)?
> 
> regards, Yogesh
> 
> On Feb 1, 3:42 pm, Steve Powell <st... at rabbitmq.com> wrote:
>> Yogesh,
>> 
>> Thank you for this problem report. First point: each connection defines a
>> (hidden) channel zero, so that explains why there are 20001 of some objects and
>> 20000 of others.
>> 
>> As to why these are not garbage collected, we must be holding a reference
>> somewhere (probably in the Connection).
>> 
>> We will investigate. I have raised a bug (24723).
>> 
>> Steve Powell  (a happy bunny)
>> ----------some more definitions from the SPD----------
>> vermin (v.) Treating the dachshund for roundworm.
>> chinchilla (n.) Cooling device for the lower jaw.
>> socialcast (n.) Someone to whom everyone is speaking but nobody likes.
>> 
>> On 31 Jan 2012, at 17:49, Yogesh Ketkar wrote:
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>>> I am using rabbitmq-java-client-bin-2.7.1/rabbitmq-client.jar with
>>> RabbitMQ 2.7.1 Server.
>> 
>>> Just run this code
>> 
>>> public static void main(String[] argv) throws IOException {
>>>    ConnectionFactory f = new ConnectionFactory();
>>>    Connection c = f.newConnection();
>>>    for(int i = 0; i < 20000; ++i) {
>>>        Channel ch = c.createChannel();
>>>        ch.close();
>>>    }
>>>    System.gc();
>>>    while(true) {}
>>> }
>> 
>>> While program is running, observe the memory usage, it keeps on
>>> increasing
>>> Get process id and do following
>>> jmap -dump:format=b,file=yo.bin  <pid>
>>> jhat jhat -J-mx768m -stack false yo.bin
>>> Once jhat brings up http server, go here
>>> http://localhost:7000/showInstanceCounts/
>> 
>>> 20001 instances of class com.rabbitmq.client.impl.AMQCommand
>>> 20001 instances of class com.rabbitmq.client.impl.CommandAssembler
>>> 20000 instances of class com.rabbitmq.client.ShutdownSignalException
>>> 20000 instances of class com.rabbitmq.client.impl.AMQImpl$Channel
>>> $Close
>>> 20000 instances of class com.rabbitmq.client.impl.ChannelN
>>> 20000 instances of class com.rabbitmq.client.impl.ConsumerDispatcher
>> 
>>> In-spite of closing all the channels, not only channels but associated
>>> objects (ShutdownSignalException, ChannelClose) continue to consume
>>> memory.
>>> For sure, knowing this now, I will use channelCreate call sparingly.
>> 
>>> Is there a way to remedy this situation?
>>> What is also worrying is instances of AMQCommand, so would this be the
>>> case for each and every call of client library?
>> 
>>> regards, Yogesh
>> 
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>> 
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