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Merge pull request #18543 from johanandren/wip-17695-api-for-sharding-state-retrieval-johanandren

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+clu #17695 add a way to inspect the current sharding state
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drewhk 2015-11-11 11:19:50 +01:00
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15
akka-docs/rst/scala/cluster-sharding.rst
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@ -344,3 +344,18 @@ if needed.
Custom shard allocation strategy can be defined in an optional parameter to
``ClusterSharding.start``. See the API documentation of ``ShardAllocationStrategy`` for details of
how to implement a custom shard allocation strategy.
Inspecting cluster sharding state
---------------------------------
Two requests to inspect the cluster state are available:
`ClusterShard.GetShardRegionState` which will return a `ClusterShard.ShardRegionState` that contains
the `ShardId`s running in a Region and what `EntityId`s are alive for each of them.
`ClusterShard.GetClusterShardingStats` which will query all the regions in the cluster and return
a `ClusterShard.ClusterShardingStats` containing the `ShardId`s running in each region and a count
of entities that are alive in each shard.
The purpose of these messages is testing and monitoring, they are not provided to give access to
directly sending messages to the individual entities.