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[Docs] Allocation setting explanation 

Closes #5748
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Nik Everett 2014-04-09 13:53:24 -04:00 committed by Lee Hinman
parent 9aa1cb408e
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22
docs/reference/cluster/update-settings.asciidoc
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@ -65,22 +65,32 @@ There is a specific list of settings that can be updated, those include:
[float]
===== Balanced Shards
All these values are relative to one another. The first three are used to
compose a three separate weighting functions into one. The cluster is balanced
when no allowed action can bring the weights of each node closer together by
more then the fourth setting. Actions might not be allowed, for instance,
due to forced awareness or allocation filtering.
`cluster.routing.allocation.balance.shard`::
Defines the weight factor for shards allocated on a node
(float). Defaults to `0.45f`.
(float). Defaults to `0.45f`. Raising this raises the tendency to
equalize the number of shards across all nodes in the cluster.
`cluster.routing.allocation.balance.index`::
Defines a factor to the number of shards per index allocated
on a specific node (float). Defaults to `0.5f`.
on a specific node (float). Defaults to `0.5f`. Raising this raises the
tendency to equalize the number of shards per index across all nodes in
the cluster.
`cluster.routing.allocation.balance.primary`::
defines a weight factor for the number of primaries of a specific index
allocated on a node (float). `0.05f`.
Defines a weight factor for the number of primaries of a specific index
allocated on a node (float). `0.05f`. Raising this raises the tendency
to equalize the number of primary shards across all nodes in the cluster.
`cluster.routing.allocation.balance.threshold`::
minimal optimization value of operations that should be performed (non
negative float). Defaults to `1.0f`.
Minimal optimization value of operations that should be performed (non
negative float). Defaults to `1.0f`. Raising this will cause the cluster
to be less aggressive about optimizing the shard balance.
[float]
===== Concurrent Rebalance