diff options
Diffstat (limited to 'qpid/cpp/src/qpid/cluster/WatchDogPlugin.cpp')
| -rw-r--r-- | qpid/cpp/src/qpid/cluster/WatchDogPlugin.cpp | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/cluster/WatchDogPlugin.cpp b/qpid/cpp/src/qpid/cluster/WatchDogPlugin.cpp index 1b813411f6..43dba5e09b 100644 --- a/qpid/cpp/src/qpid/cluster/WatchDogPlugin.cpp +++ b/qpid/cpp/src/qpid/cluster/WatchDogPlugin.cpp @@ -16,6 +16,28 @@ * */ +/**@file + + The watchdog plug-in will kill the qpidd broker process if it + becomes stuck for longer than a configured interval. + + If the watchdog plugin is loaded and the --watchdog-interval=N + option is set then the broker starts a watchdog process and signals + it every N/2 seconds. + + The watchdog process runs a very simple program that starts a timer + for N seconds, and resets the timer to N seconds whenever it is + signalled by the broker. If the timer ever reaches 0 the watchdog + kills the broker process (with kill -9) and exits. + + This is useful in a cluster setting because in some insttances + (e.g. while resolving an error) it's possible for a stuck process + to hang other cluster members that are waiting for it to send a + message. Using the watchdog, the stuck process is terminated and + removed fromt the cluster allowing other members to continue and + clients of the stuck process to fail over to other members. + +*/ #include "qpid/Plugin.h" #include "qpid/Options.h" #include "qpid/log/Statement.h" |