Avoid Network Deadlocks if possible

• Key: AMQ-1181
• Type: Improvement
• Status: Resolved
• Resolution: Fixed
• Priority: Major
• Assignee: Hiram Chirino
• Reporter: Hiram Chirino
• Affects Version/s: 4.0, 4.0.1
• Fix Version/s: 4.1.1, 5.0.0

Description

When you depend on the brokers to flow control your producers, the brokers are usually running with usage managers at 100%. Now if use this in network of brokers configuration it is very easy to get into a scenario where the brokers network bridges lock messages to send to the next broker but bock on the send and thus create a network deadlock.

Comments

[Hiram Chirino]

Several changes went into the 4.1 branch to help avoid these network deadlocks:

http://svn.apache.org/viewvc?view=rev&rev=511085 - enabled flow control again on network producers, but now use the sync acking on queues to avoid blocking the network connection. Takes advantage of the fix to AMQ-1123 solve deadlocks at the network bridge.
http://svn.apache.org/viewvc?view=rev&rev=511080 - disabled flow control on network producers

[Hiram Chirino]

Need to port the above changes to trunk.

[Jonas Lim]

ported to trunk : r514720