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+clu #16736 add registerOnMemberRemoved to get notified when current member removed from the cluster

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hepin 2015-04-17 17:28:37 +08:00
parent 2d70599d22
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6 changed files with 116 additions and 51 deletions
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22
akka-docs/rst/scala/cluster-usage.rst
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@ -86,7 +86,7 @@ Joining programatically can be performed with ``Cluster(system).join``.
You can join to any node in the cluster. It does not have to be configured as a seed node.
Note that you can only join to an existing cluster member, which means that for bootstrapping some
node must join itself.
node must join itself,and then the following nodes could join them to make up a cluster.
You may also use ``Cluster(system).joinSeedNodes`` to join programmatically,
which is attractive when dynamically discovering other nodes at startup by using some external tool or API.
@ -102,9 +102,9 @@ that the last join request is retried. Retries can be disabled by setting the pr
An actor system can only join a cluster once. Additional attempts will be ignored.
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, but it must have been removed from the cluster before the join
request is accepted.
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.
.. _automatic-vs-manual-downing-scala:
@ -271,13 +271,25 @@ before the leader changes member status of 'Joining' members to 'Up'.
.. includecode:: ../../../akka-samples/akka-sample-cluster-scala/src/main/resources/factorial.conf#role-min-nr-of-members
You can start the actors in a ``registerOnMemberUp`` callback, which will
be invoked when the current member status is changed tp 'Up', i.e. the cluster
be invoked when the current member status is changed to 'Up',i.e. the cluster
has at least the defined number of members.
.. includecode:: ../../../akka-samples/akka-sample-cluster-scala/src/main/scala/sample/cluster/factorial/FactorialFrontend.scala#registerOnUp
This callback can be used for other things than starting actors.
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.
.. 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
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
down when you installing, and depending on the race is not healthy.
Cluster Singleton
^^^^^^^^^^^^^^^^^