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[DOCS] Clarified docs for cluster.routing.allocation.same_shard.host cluster setting

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Clarified also javadocs for SameShardAllocationDecider
This commit is contained in:
Luca Cavanna 2014-01-28 11:41:16 +01:00
parent cb75830c68
commit b61ca9932a
2 changed files with 14 additions and 9 deletions
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7
docs/reference/modules/cluster.asciidoc
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@ -56,9 +56,10 @@ The following settings may be used:
deprecated[1.0.0.RC1,Replaced by `cluster.routing.allocation.enable`]
`cluster.routing.allocation.same_shard.host`::
Prevents that multiple instances of the same shard are allocated
on a single host. Defaults to `false`. This setting only applies
if multiple nodes are started on the same machine.
Allows to perform a check to prevent allocation of multiple instances
of the same shard on a single host, based on host name and host address.
Defaults to `false`, meaning that no check is performed by default. This
setting only applies if multiple nodes are started on the same machine.
`indices.recovery.concurrent_streams`::
The number of streams to open (on a *node* level) to recover a

16
src/main/java/org/elasticsearch/cluster/routing/allocation/decider/SameShardAllocationDecider.java
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@ -28,14 +28,18 @@ import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
/**
* An allocation decider that prevents multiple instances of the same shard to be
* allocated on a single <tt>host</tt>. The cluster setting can be modified in
* real-time by updating the {@value #SAME_HOST_SETTING} value of cluster setting
* API. The default is <code>false</code>.
* An allocation decider that prevents multiple instances of the same shard to
* be allocated on the same <tt>node</tt>.
*
* The {@value #SAME_HOST_SETTING} setting allows to perform a check to prevent
* allocation of multiple instances of the same shard on a single <tt>host</tt>,
* based on host name and host address. Defaults to `false`, meaning that no
* check is performed by default.
*
* <p>
* Note: this setting only applies if multiple nodes are started on the same
* <tt>host</tt>. Multiple allocations of the same shard on the same <tt>node</tt> are
* not allowed independent of this setting.
* <tt>host</tt>. Allocations of multiple copies of the same shard on the same
* <tt>node</tt> are not allowed independently of this setting.
* </p>
*/
public class SameShardAllocationDecider extends AllocationDecider {