Erik created AMQ-4521:
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Summary: stomp tcp keepalive not working
Key: AMQ-4521
URL: https://issues.apache.org/jira/browse/AMQ-4521
Project: ActiveMQ
Issue Type: Bug
Components: stomp
Affects Versions: 5.8.0, 5.6.0
Environment: Linux: Ubuntu 12.04.1 LTS (precise)
java version "1.6.0_27"
OpenJDK Runtime Environment (IcedTea6 1.12.5) (6b27-1.12.5-1)
OpenJDK Client VM (build 20.0-b12, mixed mode, sharing)
Reporter: Erik
Fix For: 5.8.0
keepAlive not working for stomp URLs. Here is the activemq.xml:
{{<transportConnector name="stomp+ssl"
uri="stomp+ssl://0.0.0.0:61613?trace=true&soLinger30000&keepAlive=true&soTimeout=44000"/>}}
Running "netstat -tupnco" as root shows java processes without the keepalive
timer counting down. This confirms that tcp keepalive is not working.
However, running activemq under the following strace command seems to indicate
tcp keepalive is being enabled with the setsockopt() system call:
bq.{{strace -o /dev/stdout -f -e setsockopt bin/activemq-admin start | grep -i
setsockopt}}
bq.{{3029 setsockopt(14, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0}}
bq.{{3029 setsockopt(128, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0}}
bq.{{3040 setsockopt(130, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0}}
bq.{{3040 setsockopt(131, SOL_TCP, TCP_NODELAY, [1], 4) = 0}}
bq.{{3040 setsockopt(131, SOL_SOCKET, SO_KEEPALIVE, [1], 4) = 0}}
bq.{{3044 setsockopt(132, SOL_TCP, TCP_NODELAY, [1], 4) = 0}}
bq.{{3029 setsockopt(133, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0}}
bq.{{3044 setsockopt(133, SOL_TCP, TCP_NODELAY, [1], 4) = 0}}
bq.{{3044 setsockopt(133, SOL_SOCKET, SO_KEEPALIVE, [1], 4) = 0}}
bq.{{3047 setsockopt(134, SOL_TCP, TCP_NODELAY, [1], 4) = 0}}
bq.{{3044 setsockopt(135, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0}}
bq.{{3029 setsockopt(135, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0}}
bq.{{3029 setsockopt(136, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0}}
bq.{{3029 setsockopt(131, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0}}
bq.{{3057 setsockopt(134, SOL_SOCKET, SO_RCVBUF, [65536], 4) = 0}}
bq.{{3057 setsockopt(134, SOL_SOCKET, SO_SNDBUF, [65536], 4) = 0}}
bq.{{3056 setsockopt(133, SOL_SOCKET, SO_RCVBUF, [65536], 4) = 0}}
bq.{{3056 setsockopt(133, SOL_SOCKET, SO_SNDBUF, [65536], 4) = 0}}
bq.{{3029 setsockopt(140, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0}}
bq.{{3029 setsockopt(140, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0}}
bq.{{3046 setsockopt(145, SOL_TCP, TCP_NODELAY, [1], 4) = 0}}
bq.{{3046 setsockopt(145, SOL_SOCKET, SO_KEEPALIVE, [1], 4) = 0}}
bq.{{3078 setsockopt(146, SOL_TCP, TCP_NODELAY, [1], 4) = 0}}
But, again, netstat output does not show keepalives being enabled. netstat
shows some java processes with keepalive, but then they quickly disappear. The
remaining long lived listening and connected sockets do not have keepalive.
netstat -tupnco
{{Active Internet connections (w/o servers)}}
{{Proto Recv-Q Send-Q Local Address Foreign Address State
PID/Program name Timer}}
{{tcp 0 0 10.5.48.17:61613 10.5.48.241:57464
ESTABLISHED 3287/java off (0.00/0/0)}}
{{tcp 0 0 10.5.48.17:22 192.168.2.10:1203
ESTABLISHED 1548/sshd: b [priv] keepalive (3768.50/0/0)}}
{{tcp 0 0 10.5.48.17:61613 169.254.6.55:35975
ESTABLISHED 3287/java off (0.00/0/0)}}
In addition, even if keepAlive was being set, this is not really a good
solution as implemented because one cannot set the keepalive options at the
socket level, only at the OS system-wide level. There's no way to set
TCP_KEEPCNT, TCP_KEEPIDLE, and TCP_KEEPINTVL. When I set the keepalive options
at the OS level, all applications are affected. I clearly don't want to use the
same keepalive settings system wide. These three settings should be allowed to
set keepalives only for activemq.
Temporary workaround: use http://libkeepalive.sourceforge.net/
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