Package org.apache.solr.search.stats

Class LRUStatsCache

java.lang.Object

org.apache.solr.search.stats.StatsCache

org.apache.solr.search.stats.ExactStatsCache

org.apache.solr.search.stats.LRUStatsCache

All Implemented Interfaces:

PluginInfoInitialized

public class LRUStatsCache
extends ExactStatsCache

Unlike ExactStatsCache this implementation preserves term stats across queries in a set of LRU caches, and based on surface features of a query it determines the need to send additional RPC-s. As a result the additional RPC-s are needed much less frequently.

Query terms and their stats are maintained in a set of maps. At the query front-end there will be as many maps as there are shards, each maintaining the respective shard statistics. At each shard server there is a single map that is updated with the global statistics on every request.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.solr.search.stats.ExactStatsCache

ExactStatsCache.ExactStatsSource

Field Summary

Fields inherited from class org.apache.solr.search.stats.StatsCache

COL_STATS_KEY, TERM_STATS_KEY, TERMS_KEY

Constructor Summary

Constructors

Constructor	Description
LRUStatsCache()

Method Summary

Modifier and Type	Method	Description
protected void	addToGlobalColStats(SolrQueryRequest req, Map.Entry<String,CollectionStats> e)
protected void	addToGlobalTermStats(SolrQueryRequest req, Map.Entry<String,TermStats> e)
protected void	addToPerShardColStats(SolrQueryRequest req, String shard, Map<String,CollectionStats> colStats)
protected void	addToPerShardTermStats(SolrQueryRequest req, String shard, String termStatsString)
StatsSource	get(SolrQueryRequest req)	Prepare local StatsSource to provide stats information to perform local scoring (to be precise, to build a local Weight from the query).
protected Map<String,CollectionStats>	getPerShardColStats(ResponseBuilder rb, String shard)
protected TermStats	getPerShardTermStats(SolrQueryRequest req, String t, String shard)
void	init(PluginInfo info)
protected void	printStats(SolrQueryRequest req)

Methods inherited from class org.apache.solr.search.stats.ExactStatsCache

mergeToGlobalStats, receiveGlobalStats, retrieveStatsRequest, returnLocalStats, sendGlobalStats

Methods inherited from class java.lang.Object

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

Constructor Detail

LRUStatsCache

public LRUStatsCache()

Method Detail

get

public StatsSource get(SolrQueryRequest req)

Description copied from class: StatsCache

Prepare local StatsSource to provide stats information to perform local scoring (to be precise, to build a local Weight from the query).

Overrides:

get in class ExactStatsCache

Parameters:

req - query request

Returns:

an instance of StatsSource to use in creating a query Weight

init

public void init(PluginInfo info)

Specified by:

init in interface PluginInfoInitialized

Overrides:

init in class ExactStatsCache

addToGlobalTermStats

protected void addToGlobalTermStats(SolrQueryRequest req,
                                    Map.Entry<String,TermStats> e)

Overrides:

addToGlobalTermStats in class ExactStatsCache

addToPerShardColStats

protected void addToPerShardColStats(SolrQueryRequest req,
                                     String shard,
                                     Map<String,CollectionStats> colStats)

Overrides:

addToPerShardColStats in class ExactStatsCache

getPerShardColStats

protected Map<String,CollectionStats> getPerShardColStats(ResponseBuilder rb,
                                                                String shard)

Overrides:

getPerShardColStats in class ExactStatsCache

addToPerShardTermStats

protected void addToPerShardTermStats(SolrQueryRequest req,
                                      String shard,
                                      String termStatsString)

Overrides:

addToPerShardTermStats in class ExactStatsCache

getPerShardTermStats

protected TermStats getPerShardTermStats(SolrQueryRequest req,
                                         String t,
                                         String shard)

Overrides:

getPerShardTermStats in class ExactStatsCache

addToGlobalColStats

protected void addToGlobalColStats(SolrQueryRequest req,
                                   Map.Entry<String,CollectionStats> e)

Overrides:

addToGlobalColStats in class ExactStatsCache

printStats

protected void printStats(SolrQueryRequest req)

Overrides:

printStats in class ExactStatsCache