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min-nr-of-members and registerOnMemberUp, see #2306

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* Leader moves joining members to up when min-nr-of-members reached
* Tested by MinMembersBeforeUpSpec
* Used in factorial sample
* Docs
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Patrik Nordwall 2012-12-10 08:46:25 +01:00
parent d642fab666
commit 44ab9f116f
13 changed files with 241 additions and 105 deletions
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19
akka-docs/rst/cluster/cluster-usage-java.rst
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@ -239,6 +239,25 @@ frontend nodes and 3 backend nodes::
.. note:: The above example should probably be designed as two separate, frontend/backend, clusters, when there is a `cluster client for decoupling clusters <https://www.assembla.com/spaces/akka/tickets/1165>`_.
How To Startup when Cluster Size Reached
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
A common use case is to start actors after the cluster has been initialized,
members have joined, and the cluster has reached a certain size.
With a configuration option you can define required number of members
before the leader changes member status of 'Joining' members to 'Up'.
.. includecode:: ../../../akka-samples/akka-sample-cluster/src/main/resources/factorial.conf#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
has at least the defined number of members.
.. includecode:: ../../../akka-samples/akka-sample-cluster/src/main/java/sample/cluster/factorial/japi/FactorialFrontendMain.java#registerOnUp
This callback can be used for other things than starting actors.
Failure Detector
^^^^^^^^^^^^^^^^

19
akka-docs/rst/cluster/cluster-usage-scala.rst
View file

@ -212,6 +212,25 @@ frontend nodes and 3 backend nodes::
.. note:: The above example should probably be designed as two separate, frontend/backend, clusters, when there is a `cluster client for decoupling clusters <https://www.assembla.com/spaces/akka/tickets/1165>`_.
How To Startup when Cluster Size Reached
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
A common use case is to start actors after the cluster has been initialized,
members have joined, and the cluster has reached a certain size.
With a configuration option you can define required number of members
before the leader changes member status of 'Joining' members to 'Up'.
.. includecode:: ../../../akka-samples/akka-sample-cluster/src/main/resources/factorial.conf#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
has at least the defined number of members.
.. includecode:: ../../../akka-samples/akka-sample-cluster/src/main/scala/sample/cluster/factorial/FactorialSample.scala#registerOnUp
This callback can be used for other things than starting actors.
Failure Detector
^^^^^^^^^^^^^^^^