Class SameShardAllocationDecider
java.lang.Object
org.elasticsearch.cluster.routing.allocation.decider.AllocationDecider
org.elasticsearch.cluster.routing.allocation.decider.SameShardAllocationDecider
public class SameShardAllocationDecider extends AllocationDecider
An allocation decider that prevents multiple instances of the same shard to
be allocated on the same
node
.
The CLUSTER_ROUTING_ALLOCATION_SAME_HOST_SETTING
setting 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.
Note: this setting only applies if multiple nodes are started on the same
host
. Allocations of multiple copies of the same shard on the same
node
are not allowed independently of this setting.
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Field Summary
Fields Modifier and Type Field Description static Setting<java.lang.Boolean>
CLUSTER_ROUTING_ALLOCATION_SAME_HOST_SETTING
static java.lang.String
NAME
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Constructor Summary
Constructors Constructor Description SameShardAllocationDecider(Settings settings, ClusterSettings clusterSettings)
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Method Summary
Modifier and Type Method Description Decision
canAllocate(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation)
Returns aDecision
whether the given shard routing can be allocated on the given node.Decision
canForceAllocatePrimary(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation)
Returns aDecision
whether the given primary shard can be forcibly allocated on the given node.Methods inherited from class org.elasticsearch.cluster.routing.allocation.decider.AllocationDecider
canAllocate, canAllocate, canRebalance, canRebalance, canRemain, shouldAutoExpandToNode
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Field Details
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NAME
public static final java.lang.String NAME- See Also:
- Constant Field Values
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CLUSTER_ROUTING_ALLOCATION_SAME_HOST_SETTING
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Constructor Details
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SameShardAllocationDecider
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Method Details
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canAllocate
public Decision canAllocate(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation)Description copied from class:AllocationDecider
Returns aDecision
whether the given shard routing can be allocated on the given node. The default isDecision.ALWAYS
.- Overrides:
canAllocate
in classAllocationDecider
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canForceAllocatePrimary
public Decision canForceAllocatePrimary(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation)Description copied from class:AllocationDecider
Returns aDecision
whether the given primary shard can be forcibly allocated on the given node. This method should only be called for unassigned primary shards where the node has a shard copy on disk. Note: all implementations that override this behavior should take into account the results ofAllocationDecider.canAllocate(ShardRouting, RoutingNode, RoutingAllocation)
before making a decision on force allocation, because force allocation should only be considered if all deciders returnDecision.NO
.- Overrides:
canForceAllocatePrimary
in classAllocationDecider
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