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

Class NodePreferenceRulesComparator

java.lang.Object

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

public class NodePreferenceRulesComparator
extends 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 fewer 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 baseUrl, String hostName, NodesSysProps sysProps, ReplicaListTransformerFactory defaultRltFactory, ReplicaListTransformerFactory stableRltFactory)
NodePreferenceRulesComparator(List<PreferenceRule> preferenceRules, SolrParams requestParams, ReplicaListTransformerFactory defaultRltFactory, ReplicaListTransformerFactory stableRltFactory)

Method Summary

Modifier and Type	Method	Description
ReplicaListTransformer	getBaseReplicaListTransformer()
<T> Comparator<T>	getComparator(T example)
List<PreferenceRule>	getPreferenceRules()
Comparator<Replica>	getReplicaComparator()
Comparator<String>	getUrlComparator()

Methods inherited from class java.lang.Object

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

Constructor Details

NodePreferenceRulesComparator

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

NodePreferenceRulesComparator

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

Method Details

getBaseReplicaListTransformer

public ReplicaListTransformer getBaseReplicaListTransformer()

getComparator

public <T> Comparator<T> getComparator(T example)

getReplicaComparator

public Comparator<Replica> getReplicaComparator()

getUrlComparator

public Comparator<String> getUrlComparator()

getPreferenceRules

public List<PreferenceRule> getPreferenceRules()