Need a way to set tcpNoDelay on peer transport TCP network connections
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Key: AMQ-1143
URL: https://issues.apache.org/activemq/browse/AMQ-1143
Project: ActiveMQ
Issue Type: Improvement
Components: Transport
Affects Versions: 4.1.0
Environment: Windows XP Professional / JRE 1.5.0_11
Reporter: Andrew Steele
I really like the peer transport in ActiveMQ. It seems to be just the kind of
setup we need. However, we do have low round-trip latency requirements in some
applications. I was seeing unacceptably bad latencies (~200ms) for synchronous
round trips. I installed Wireshark and performed network analysis to see what
was going on. It appeared to be a Nagle algorithm / TCP ACK delay issue.
Essentially, after the first message request and reply, the next request
message may be delayed while waiting for a delayed ACK from the other broker.
This should be resolvable by enabling tcpNoDelay. However, the peer transport
URI provides no mechanism to enable tcpNoDelay. In fact, I went into the
source code and found that the TCP network connecter specified in the
PeerTransportFactory is hard coded to tcp://localhost:0. Basically, I need a
way to turn on tcpNoDelay in peer transport.
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