Package org.elasticsearch.indices

Class ShardLimitValidator

java.lang.Object

org.elasticsearch.indices.ShardLimitValidator

public class ShardLimitValidator
extends Object

This class contains the logic used to check the cluster-wide shard limit before shards are created and ensuring that the limit is updated correctly on setting updates, etc. NOTE: This is the limit applied at *shard creation time*. If you are looking for the limit applied at *allocation* time, which is controlled by a different setting, see ShardsLimitAllocationDecider.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	FROZEN_GROUP
static final Setting<String>	INDEX_SETTING_SHARD_LIMIT_GROUP
static final Setting<Integer>	SETTING_CLUSTER_MAX_SHARDS_PER_NODE
static final Setting<Integer>	SETTING_CLUSTER_MAX_SHARDS_PER_NODE_FROZEN
protected final AtomicInteger	shardLimitPerNode
protected final AtomicInteger	shardLimitPerNodeFrozen

Constructor Summary

Constructors

Constructor	Description
ShardLimitValidator(Settings settings, ClusterService clusterService)

Method Summary

Modifier and Type	Method	Description
static boolean	canAddShardsToCluster(int numberOfNewShards, int replicas, ClusterState state, boolean frozenNodes)	This method decides whether there is enough room in the cluster to add the given number of shards with the given number of replicas without exceeding the "cluster.max_shards_per_node.frozen" setting if the shards are going on frozen nodes or the "cluster.max_shards_per_node" setting if the shards are going on normal nodes.
int	getShardLimitPerNode()	Gets the currently configured value of the SETTING_CLUSTER_MAX_SHARDS_PER_NODE setting.
void	validateShardLimit(ClusterState currentState, Index[] indicesToOpen)	Validates whether a list of indices can be opened without going over the cluster shard limit.
void	validateShardLimit(Settings settings, ClusterState state)	Checks whether an index can be created without going over the cluster shard limit.
void	validateShardLimitOnReplicaUpdate(ClusterState currentState, Index[] indices, int replicas)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

SETTING_CLUSTER_MAX_SHARDS_PER_NODE

public static final Setting<Integer> SETTING_CLUSTER_MAX_SHARDS_PER_NODE

SETTING_CLUSTER_MAX_SHARDS_PER_NODE_FROZEN

public static final Setting<Integer> SETTING_CLUSTER_MAX_SHARDS_PER_NODE_FROZEN

FROZEN_GROUP

public static final String FROZEN_GROUP

See Also:

• Constant Field Values

INDEX_SETTING_SHARD_LIMIT_GROUP

public static final Setting<String> INDEX_SETTING_SHARD_LIMIT_GROUP

shardLimitPerNode

protected final AtomicInteger shardLimitPerNode

shardLimitPerNodeFrozen

protected final AtomicInteger shardLimitPerNodeFrozen

Constructor Details

ShardLimitValidator

public ShardLimitValidator(Settings settings,
 ClusterService clusterService)

Method Details

getShardLimitPerNode

public int getShardLimitPerNode()

Gets the currently configured value of the SETTING_CLUSTER_MAX_SHARDS_PER_NODE setting.

Returns:

the current value of the setting

validateShardLimit

public void validateShardLimit(Settings settings,
 ClusterState state)

Checks whether an index can be created without going over the cluster shard limit.

Parameters:

settings - the settings of the index to be created

state - the current cluster state

Throws:

ValidationException - if creating this index would put the cluster over the cluster shard limit

validateShardLimit

public void validateShardLimit(ClusterState currentState,
 Index[] indicesToOpen)

Validates whether a list of indices can be opened without going over the cluster shard limit. Only counts indices which are currently closed and will be opened, ignores indices which are already open.

Parameters:

currentState - The current cluster state.

indicesToOpen - The indices which are to be opened.

Throws:

ValidationException - If this operation would take the cluster over the limit and enforcement is enabled.

validateShardLimitOnReplicaUpdate

public void validateShardLimitOnReplicaUpdate(ClusterState currentState,
 Index[] indices,
 int replicas)

canAddShardsToCluster

public static boolean canAddShardsToCluster(int numberOfNewShards,
 int replicas,
 ClusterState state,
 boolean frozenNodes)

This method decides whether there is enough room in the cluster to add the given number of shards with the given number of replicas without exceeding the "cluster.max_shards_per_node.frozen" setting if the shards are going on frozen nodes or the "cluster.max_shards_per_node" setting if the shards are going on normal nodes. This check does not guarantee that the number of shards can be added, just that there is theoretically room to add them without exceeding the shards per node configuration.

Parameters:

numberOfNewShards - The number of primary shards that we want to be able to add to the cluster

replicas - The number of replcas of the primary shards that we want to be able to add to the cluster

state - The cluster state, used to get cluster settings and to get the number of open shards already in the cluster

frozenNodes - If true, check whether there is room to put these shards onto frozen nodes. If false, check whether there is room to put these shards onto normal nodes.

Returns:

True if there is room to add the requested number of shards to the cluster, and false if there is not