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clu #17565 Invoke OnMemberRemoved callback when

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cluster.shutdown

* must also be done when the listener actor stops before the
  MemberRemoved event has been received
* add test for this
* clarify docs with example that shuts down actor system and
  exit jvm
This commit is contained in:
Patrik Nordwall 2015-05-26 09:00:40 +02:00
parent ba8756d485
commit 8a7d7715b5
6 changed files with 60 additions and 13 deletions
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13
akka-docs/rst/scala/cluster-usage.rst
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@ -107,7 +107,8 @@ An actor system can only join a cluster once. Additional attempts will be ignore
When it has successfully joined it must be restarted to be able to join another
cluster or to join the same cluster again.It can use the same host name and port
after the restart, when it come up as new incarnation of existing member in the cluster,
trying to join in ,then the existing one will be removed from the cluster and then it will be allowed to join.
trying to join in, then the existing one will be removed from the cluster and then it will
be allowed to join.
.. _automatic-vs-manual-downing-scala:
@ -281,15 +282,21 @@ has at least the defined number of members.
This callback can be used for other things than starting actors.
How To Cleanup when Member is Removed
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
You can do some clean up in a ``registerOnMemberRemoved`` callback, which will
be invoked when the current member status is changed to 'Removed' or the cluster have been shutdown,i.e.
terminate the actor system.
For example, this is how to shut down the ``ActorSystem`` and thereafter exit the JVM:
.. includecode:: ../../../akka-samples/akka-sample-cluster-scala/src/main/scala/sample/cluster/factorial/FactorialFrontend.scala#registerOnRemoved
.. note:: Register a OnMemberRemoved callback on a cluster that have been shutdown, the callback will be invoked immediately on
.. note::
Register a OnMemberRemoved callback on a cluster that have been shutdown, the callback will be invoked immediately on
the caller thread, otherwise it will be invoked later when the current member status changed to 'Removed'. You may
want to install some cleanup handling after the cluster was started up,but the cluster might already be shutting
want to install some cleanup handling after the cluster was started up, but the cluster might already be shutting
down when you installing, and depending on the race is not healthy.
Cluster Singleton