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From Andrei Shakirin <>
Subject Excessive number of connections by failover transport
Date Sat, 27 Jan 2018 16:33:14 GMT

Could you give any suggestion how to workaround / investigate following problem on ActiveMQ

1) Versions: AMQ client 5.14.1; AMQ server 5.13.4
2) Occurrence: only sometimes
3) Connection: failover protocol using url: failover:(tcp://serverA:61616,tcp://serverB:61616)?randomize=false&priorityBackup=true
4) Client details: producers use PooledConnectionFactory, consumers - native ActiveMQConnectionFactory

5) Symptoms:
Suddenly AMQ Server log explodes with the messages like:

2018-01-26 09:26:16,909 | WARN  | Failed to register MBean org.apache.activemq :type=Broker,brokerName=activemq-vm-primary,connector=clientConnectors,connect
7-1516883370639-0_22 |
on | ActiveMQ Transport: tcp:///

2018-01-26 09:26:21,375 | WARN  | Ignoring ack received before dispatch; result of failover
with an outstanding ack. Acked messages will be replayed if present on this broker. Ignored
ack: MessageAck {commandId = 157, responseRequired = false, ackType = 2, consumerId = ID:ca8f70e115d0-37087-1516883370639-1:22:10:1,
firstMessageId = ID:a95345a9c0df-33771-1516883685728-1:17:5:1:23, lastMessageId = ID:a95345a9c0df-33771-1516883685728-1:17:5:1:23,
destination = queue://Q.CHECKOUT.AUFTRAG_OUT, transactionId = null, messageCount = 1, poisonCause
= null} | | ActiveMQ Transport: tcp:///

2018-01-26 09:26:39,211 | WARN  | Transport Connection to: tcp:// failed: Connection reset |
| ActiveMQ InactivityMonitor Worker

2018-01-26 09:26:47,175 | WARN  | Transport Connection to: tcp:// failed: Broken pipe (Write failed) |
| ActiveMQ InactivityMonitor Worker

After short period of time AMQ server comes out of resources with "java.lang.OutOfMemoryError:
unable to create new native thread" error. The AMQ service process in this case has a huge
number of threads (some thousands) 

The client side log contains a lot of reconnection attempts messages like:
2018-01-26 00:10:31,387 WARN    [{{,org.apache.activemq.activemq-osgi}{bundle.version,5.14.1}{,181}}]
    [null]  org.apache.activemq.transport.failover.FailoverTransport      Failed to connect
to [tcp://activemq-vm-primary:61616, tcp://activemq-vm-secondary:61616] after: 810 attempt(s)
continuing to retry.

It seems that client creates a huge number of connections by failover retry and after some
time kills the server. 
Issue looks very similar to described in, however
server isn't configured with access control settings.
I found the description of similar problem into
 ,  but without concrete suggestion.

The server log file is attached.

Could you please provide any suggestion how to deal with the problem? 


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