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 (with the same life-cycle as SolrIndexSearcher), and based on surface features of a query it determines the need to send additional requests to retrieve local term and collection statistics from shards. As a result the additional requests may be needed much less frequently.

Query terms, their stats and field stats are maintained in LRU caches, with the size by default DEFAULT_MAX_SIZE, one cache per shard. These caches are updated as needed (when term or field statistics are missing). Each instance of the component keeps also a global stats cache, which is aggregated from per-shard caches.

Cache entries expire after a max idle time, by default DEFAULT_MAX_IDLE_TIME.

Nested Class Summary

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

ExactStatsCache.ExactStatsSource

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

StatsCache.StatsCacheMetrics

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_MAX_IDLE_TIME
static int	DEFAULT_MAX_SIZE

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

COL_STATS_KEY, FIELDS_KEY, pluginInfo, statsCacheMetrics, TERM_STATS_KEY, TERMS_KEY

Constructor Summary

Constructors

Constructor and Description
LRUStatsCache()

Method Summary

Modifier and Type	Method and 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)
void	clear() Clear cached statistics.
protected StatsSource	doGet(SolrQueryRequest req)
protected ShardRequest	doRetrieveStatsRequest(ResponseBuilder rb)
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

doMergeToGlobalStats, doReceiveGlobalStats, doReturnLocalStats, doSendGlobalStats

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

approxCheckMissingStats, get, getCacheMetrics, mergeToGlobalStats, receiveGlobalStats, retrieveStatsRequest, returnLocalStats, sendGlobalStats

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_MAX_SIZE

public static final int DEFAULT_MAX_SIZE

See Also:

Constant Field Values

DEFAULT_MAX_IDLE_TIME

public static final int DEFAULT_MAX_IDLE_TIME

See Also:

Constant Field Values

Constructor Detail

LRUStatsCache

public LRUStatsCache()

Method Detail

doGet

protected StatsSource doGet(SolrQueryRequest req)

Overrides:

doGet in class ExactStatsCache

clear

public void clear()

Description copied from class: StatsCache

Clear cached statistics.

Overrides:

clear in class StatsCache

init

public void init(PluginInfo info)

Specified by:

init in interface PluginInfoInitialized

Overrides:

init in class StatsCache

doRetrieveStatsRequest

protected ShardRequest doRetrieveStatsRequest(ResponseBuilder rb)

Overrides:

doRetrieveStatsRequest 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