Package org.elasticsearch.cluster.routing.allocation.decider

Class DiskThresholdDecider

java.lang.Object

org.elasticsearch.cluster.routing.allocation.decider.AllocationDecider

org.elasticsearch.cluster.routing.allocation.decider.DiskThresholdDecider

public class DiskThresholdDecider
extends AllocationDecider

The DiskThresholdDecider checks that the node a shard is potentially being allocated to has enough disk space. It has three configurable settings, all of which can be changed dynamically: cluster.routing.allocation.disk.watermark.low is the low disk watermark. New shards will not allocated to a node with usage higher than this, although this watermark may be passed by allocating a shard. It defaults to 0.85 (85.0%). cluster.routing.allocation.disk.watermark.high is the high disk watermark. If a node has usage higher than this, shards are not allowed to remain on the node. In addition, if allocating a shard to a node causes the node to pass this watermark, it will not be allowed. It defaults to 0.90 (90.0%). Both watermark settings are expressed in terms of used disk percentage, or exact byte values for free space (like "500mb") cluster.routing.allocation.disk.threshold_enabled is used to enable or disable this decider. It defaults to true (enabled).

Field Summary

Fields

Modifier and Type	Field	Description
static Setting<Boolean>	ENABLE_FOR_SINGLE_DATA_NODE
static String	NAME
static Setting<Boolean>	SETTING_IGNORE_DISK_WATERMARKS

Constructor Summary

Constructors

Constructor	Description
DiskThresholdDecider(Settings settings, ClusterSettings clusterSettings)

Method Summary

Modifier and Type	Method	Description
Decision	canAllocate(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation)	Returns a Decision whether the given shard routing can be allocated on the given node.
Decision	canRemain(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation)	Returns a Decision whether the given shard routing can be remain on the given node.
static long	getExpectedShardSize(ShardRouting shard, long defaultValue, ClusterInfo clusterInfo, SnapshotShardSizeInfo snapshotShardSizeInfo, Metadata metadata, RoutingTable routingTable)	Returns the expected shard size for the given shard or the default value provided if not enough information are available to estimate the shards size.
static long	sizeOfRelocatingShards(RoutingNode node, boolean subtractShardsMovingAway, String dataPath, ClusterInfo clusterInfo, Metadata metadata, RoutingTable routingTable)	Returns the size of all shards that are currently being relocated to the node, but may not be finished transferring yet.

Methods inherited from class org.elasticsearch.cluster.routing.allocation.decider.AllocationDecider

canAllocate, canAllocate, canForceAllocatePrimary, canRebalance, canRebalance, shouldAutoExpandToNode

Methods inherited from class java.lang.Object

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

Field Details

NAME

public static final String NAME

See Also:

Constant Field Values

ENABLE_FOR_SINGLE_DATA_NODE

public static final Setting<Boolean> ENABLE_FOR_SINGLE_DATA_NODE

SETTING_IGNORE_DISK_WATERMARKS

public static final Setting<Boolean> SETTING_IGNORE_DISK_WATERMARKS

Constructor Details

DiskThresholdDecider

public DiskThresholdDecider(Settings settings,
 ClusterSettings clusterSettings)

Method Details

sizeOfRelocatingShards

public static long sizeOfRelocatingShards(RoutingNode node,
 boolean subtractShardsMovingAway,
 String dataPath,
 ClusterInfo clusterInfo,
 Metadata metadata,
 RoutingTable routingTable)

Returns the size of all shards that are currently being relocated to the node, but may not be finished transferring yet. If subtractShardsMovingAway is true then the size of shards moving away is subtracted from the total size of all shards

canAllocate

public Decision canAllocate(ShardRouting shardRouting,
 RoutingNode node,
 RoutingAllocation allocation)

Description copied from class: AllocationDecider

Returns a Decision whether the given shard routing can be allocated on the given node. The default is Decision.ALWAYS.

Overrides:

canAllocate in class AllocationDecider

canRemain

public Decision canRemain(ShardRouting shardRouting,
 RoutingNode node,
 RoutingAllocation allocation)

Description copied from class: AllocationDecider

Returns a Decision whether the given shard routing can be remain on the given node. The default is Decision.ALWAYS.

Overrides:

canRemain in class AllocationDecider

getExpectedShardSize

public static long getExpectedShardSize(ShardRouting shard,
 long defaultValue,
 ClusterInfo clusterInfo,
 SnapshotShardSizeInfo snapshotShardSizeInfo,
 Metadata metadata,
 RoutingTable routingTable)

Returns the expected shard size for the given shard or the default value provided if not enough information are available to estimate the shards size.