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!act #3583 Timer based auto-down

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* Replace (deprecate) akka.cluster.auto-down config setting with
  akka.cluster.auto-down-unreachable-after
* AutoDown actor that keeps track of unreachable members
  and performs down from the leader node when they have been
  unreachable for the specified duration
* Migration guide
This commit is contained in:
Patrik Nordwall 2013-09-11 16:09:51 +02:00
parent c55189f615
commit d5b25cbbc6
27 changed files with 355 additions and 450 deletions
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11
akka-docs/rst/java/cluster-usage.rst
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@ -150,12 +150,21 @@ It can also be performed programatically with ``Cluster.get(system).down(address
You can enable automatic downing with configuration::
akka.cluster.auto-down = on
akka.cluster.auto-down-unreachable-after = 120s
This means that the cluster leader member will change the ``unreachable`` node
status to ``down`` automatically after the configured time of unreachability.
Be aware of that using auto-down implies that two separate clusters will
automatically be formed in case of network partition. That might be
desired by some applications but not by others.
.. note:: If you have *auto-down* enabled and the failure detector triggers, you
can over time end up with a lot of single node clusters if you don't put
measures in place to shut down nodes that have become ``unreachable``. This
follows from the fact that the ``unreachable`` node will likely see the rest of
the cluster as ``unreachable``, become its own leader and form its own cluster.
Leaving
^^^^^^^