Package org.apache.solr.client.solrj.routing

Class NodePreferenceRulesComparator

java.lang.Object

org.apache.solr.client.solrj.routing.NodePreferenceRulesComparator

All Implemented Interfaces:

Comparator<Object>

public class NodePreferenceRulesComparator
extends Object
implements Comparator<Object>

This comparator makes sure that the given replicas are sorted according to the given list of preferences. E.g. If all nodes prefer local cores then a bad/heavily-loaded node will receive less requests from healthy nodes. This will help prevent a distributed deadlock or timeouts in all the healthy nodes due to one bad node.

Optional final preferenceRule is *not* used for pairwise sorting, but instead defines how "equivalent" replicas will be ordered (the base ordering). Defaults to "random"; may specify "stable".

Constructor Summary

Constructors

Constructor	Description
NodePreferenceRulesComparator(List<PreferenceRule> preferenceRules, SolrParams requestParams, String nodeName, String localHostAddress, NodesSysProps sysProps, ReplicaListTransformerFactory defaultRltFactory, ReplicaListTransformerFactory stableRltFactory)
NodePreferenceRulesComparator(List<PreferenceRule> preferenceRules, SolrParams requestParams, ReplicaListTransformerFactory defaultRltFactory, ReplicaListTransformerFactory stableRltFactory)

Method Summary

Modifier and Type	Method	Description
int	compare(Object left, Object right)
ReplicaListTransformer	getBaseReplicaListTransformer()
List<PreferenceRule>	getPreferenceRules()
List<PreferenceRule>	getSortRules()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

NodePreferenceRulesComparator

public NodePreferenceRulesComparator(List<PreferenceRule> preferenceRules,
                                     SolrParams requestParams,
                                     ReplicaListTransformerFactory defaultRltFactory,
                                     ReplicaListTransformerFactory stableRltFactory)

NodePreferenceRulesComparator

public NodePreferenceRulesComparator(List<PreferenceRule> preferenceRules,
                                     SolrParams requestParams,
                                     String nodeName,
                                     String localHostAddress,
                                     NodesSysProps sysProps,
                                     ReplicaListTransformerFactory defaultRltFactory,
                                     ReplicaListTransformerFactory stableRltFactory)

Method Detail

getBaseReplicaListTransformer

public ReplicaListTransformer getBaseReplicaListTransformer()

compare

public int compare(Object left,
                   Object right)

Specified by:

compare in interface Comparator<Object>

getSortRules

public List<PreferenceRule> getSortRules()

getPreferenceRules

public List<PreferenceRule> getPreferenceRules()