org.infinispan.configuration.cache.HashConfiguration Maven / Gradle / Ivy
package org.infinispan.configuration.cache;
import org.infinispan.commons.configuration.attributes.Attribute;
import org.infinispan.commons.configuration.attributes.AttributeDefinition;
import org.infinispan.commons.configuration.attributes.AttributeSet;
import org.infinispan.commons.configuration.attributes.IdentityAttributeCopier;
import org.infinispan.commons.configuration.attributes.SimpleInstanceAttributeCopier;
import org.infinispan.commons.hash.Hash;
import org.infinispan.commons.hash.MurmurHash3;
import org.infinispan.distribution.ch.ConsistentHash;
import org.infinispan.distribution.ch.ConsistentHashFactory;
import org.infinispan.distribution.ch.KeyPartitioner;
import org.infinispan.distribution.ch.impl.HashFunctionPartitioner;
/**
* Allows fine-tuning of rehashing characteristics. Must only used with 'distributed' cache mode.
*
* @author pmuir
*/
public class HashConfiguration {
public static final AttributeDefinition CONSISTENT_HASH_FACTORY = AttributeDefinition.builder("consistentHashFactory", null, ConsistentHashFactory.class).immutable().build();
public static final AttributeDefinition HASH = AttributeDefinition.builder("hash", (Hash)MurmurHash3.getInstance()).copier(IdentityAttributeCopier.INSTANCE).immutable().build();
public static final AttributeDefinition NUM_OWNERS = AttributeDefinition.builder("numOwners" , 2).xmlName("owners").immutable().build();
// Because it assigns owners randomly, SyncConsistentHashFactory doesn't work very well with a low number
// of segments. (With DefaultConsistentHashFactory, 60 segments was ok up to 6 nodes.)
public static final AttributeDefinition NUM_SEGMENTS = AttributeDefinition.builder("numSegments", 256).xmlName("segments").immutable().build();
public static final AttributeDefinition CAPACITY_FACTOR= AttributeDefinition.builder("capacityFactor", 1.0f).immutable().xmlName("capacity").build();
public static final AttributeDefinition KEY_PARTITIONER = AttributeDefinition
.builder("keyPartitioner", new HashFunctionPartitioner(), KeyPartitioner.class)
.copier(SimpleInstanceAttributeCopier.INSTANCE).immutable().build();
static AttributeSet attributeDefinitionSet() {
return new AttributeSet(HashConfiguration.class, CONSISTENT_HASH_FACTORY, HASH, NUM_OWNERS,
NUM_SEGMENTS, CAPACITY_FACTOR, KEY_PARTITIONER);
}
private final Attribute consistentHashFactory;
private final Attribute hash;
private final Attribute numOwners;
private final Attribute numSegments;
private final Attribute capacityFactor;
private final Attribute keyPartitioner;
private final GroupsConfiguration groupsConfiguration;
private final StateTransferConfiguration stateTransferConfiguration;
private final AttributeSet attributes;
HashConfiguration(AttributeSet attributes, GroupsConfiguration groupsConfiguration,
StateTransferConfiguration stateTransferConfiguration) {
this.attributes = attributes.checkProtection();
this.groupsConfiguration = groupsConfiguration;
this.stateTransferConfiguration = stateTransferConfiguration;
consistentHashFactory = attributes.attribute(CONSISTENT_HASH_FACTORY);
hash = attributes.attribute(HASH);
numOwners = attributes.attribute(NUM_OWNERS);
numSegments = attributes.attribute(NUM_SEGMENTS);
capacityFactor = attributes.attribute(CAPACITY_FACTOR);
keyPartitioner = attributes.attribute(KEY_PARTITIONER);
}
/**
* @deprecated Since 5.2, replaced by {@link #consistentHashFactory()}.
*/
@Deprecated
public ConsistentHash consistentHash() {
return null;
}
/**
* The consistent hash factory in use.
*/
public ConsistentHashFactory consistentHashFactory() {
return consistentHashFactory.get();
}
/**
* The hash function in use. Used as a bit spreader and a general hash code generator.
* Typically one of the the many default {@link org.infinispan.distribution.ch.ConsistentHash}
* implementations shipped.
* @deprecated Since 8.2, use {@link #keyPartitioner()} instead.
*/
@Deprecated
public Hash hash() {
return hash.get();
}
/**
* Number of cluster-wide replicas for each cache entry.
*/
public int numOwners() {
return numOwners.get();
}
/**
* Controls the total number of hash space segments (per cluster).
*
* A hash space segment is the granularity for key distribution in the cluster: a node can own
* (or primary-own) one or more full segments, but not a fraction of a segment. As such, larger
* {@code numSegments} values will mean a more even distribution of keys between nodes.
*
On the other hand, the memory/bandwidth usage of the new consistent hash grows linearly with
* {@code numSegments}. So we recommend keeping {@code numSegments <= 10 * clusterSize}.
*/
public int numSegments() {
return numSegments.get();
}
/**
* If false, no rebalancing or rehashing will take place when a new node joins the cluster or a
* node leaves
* @deprecated Use {@link org.infinispan.configuration.cache.StateTransferConfiguration#fetchInMemoryState()} instead.
*/
@Deprecated
public boolean rehashEnabled() {
return stateTransferConfiguration.fetchInMemoryState();
}
/**
* Rehashing timeout
* @deprecated Use {@link org.infinispan.configuration.cache.StateTransferConfiguration#timeout()} instead.
*/
@Deprecated
public long rehashRpcTimeout() {
return stateTransferConfiguration.timeout();
}
/**
* @deprecated Use {@link org.infinispan.configuration.cache.StateTransferConfiguration#timeout()} instead.
*/
@Deprecated
public long rehashWait() {
return stateTransferConfiguration.timeout();
}
/**
* Controls the proportion of entries that will reside on the local node, compared to the other nodes in the
* cluster. This is just a suggestion, there is no guarantee that a node with a capacity factor of {@code 2} will
* have twice as many entries as a node with a capacity factor of {@code 1}.
*/
public float capacityFactor() {
return capacityFactor.get();
}
public KeyPartitioner keyPartitioner() {
return keyPartitioner.get();
}
/**
* Configuration for various grouper definitions. See the user guide for more information.
*/
public GroupsConfiguration groups() {
return groupsConfiguration;
}
public AttributeSet attributes() {
return attributes;
}
@Override
public String toString() {
return "HashConfiguration [attributes=" + attributes + "]";
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
HashConfiguration other = (HashConfiguration) obj;
if (attributes == null) {
if (other.attributes != null)
return false;
} else if (!attributes.equals(other.attributes))
return false;
return true;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((attributes == null) ? 0 : attributes.hashCode());
return result;
}
}