Filter cache statistics

Record core-specific filter cache statistics over time.

All statistics reset upon node restart.

This table is configured with gc_grace_seconds 0 to avoid issues with persistent tombstones as rows expire; tombstones are removed during compaction no matter how recently they were created.

Solr exposes a core’s filter cache statistics through its registered index searcher, but the core may have many index searchers over its lifetime. To reflect this, statistics are provided for the currently registered searcher as well as cumulative/lifetime statistics.

If the dseFilterCache hit_ratio declines over time, and this hit_ratio decline corresponds to a higher average latency from the QueryMetrics.getAverageLatency(EXECUTE, null) MBean, consider increasing the size of your filter cache in search index config.

JMX analog

solr/core/dseFilterCache/com.datastax.bdp.search.solr.FilterCacheMBean

Schema

CREATE TABLE dse_perf.solr_filter_cache_stats (
  node_ip inet,
  core text,
  date timestamp,
  time timestamp,
  hits bigint,
  inserts bigint,
  evictions bigint,
  hit_ratio float,
  lookups bigint,
  num_entries bigint,
  cumulative_lookups bigint,
  cumulative_hits bigint,
  cumulative_hitratio float,
  cumulative_inserts bigint,
  cumulative_evictions bigint,
  warmup_time bigint,
  PRIMARY KEY ((node_ip, core, date), time)
)
WITH gc_grace_seconds=0

Field purpose
Field	Type	Purpose
`node_ip`	inet	Node IP address.
core	text	Search index name, such as `keyspace_name.table_name`.
date	timestamp	Midnight on the mm/dd/yyyy the statistics were recorded.
time	timestamp	The exact time the statistics were recorded.
hits	bigint	Cache hits for the registered index searcher.
inserts	bigint	Cache insertions for the registered index searcher.
evictions	bigint	Cache evictions for the registered index searcher.
`hit_ratio`	float	The ratio of cache hits/lookups for the registered index searcher.
lookups	bigint	Cache lookups for the registered index searcher.
`num_entries`	bigint	Number of cache entries for the registered index searcher.
`cumulative_lookups`	bigint	Cumulative cache lookups for the core.
`cumulative_hits`	bigint	Cumulative cache hits for the core.
`cumulative_hitratio`	float	Cumulative ratio of cache hits/lookups for the core.
`cumulative_inserts`	bigint	Cumulative cache inserts for the core.
`cumulative_evictions`	bigint	Cumulative cache evictions for the core.
`warmup_time`	bigint	Warm-up time for the registered index searcher.

Snapshots for cumulative statistics recorded on 10/17/2014 for core keyspace.table on the node 127.0.0.1:

SELECT cumulative_lookups, cumulative_hits, cumulative_hitratio, cumulative_inserts
FROM solr_filter_cache_stats
WHERE node_ip = '127.0.0.1' AND core = 'keyspace.table' AND date = '2014-10-17';

Most recent 5 snapshots recorded on 10/17/2014 for core keyspace.table on the node 127.0.0.1:

SELECT *
FROM solr_filter_cache_stats
WHERE node_ip = '127.0.0.1'
    AND core = 'keyspace.table'
    AND date = '2014-10-17'
ORDER BY time DESC
LIMIT 5;

Collecting cache statistics

Filter cache statistics

JMX analog

Schema

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Filter cache statistics

JMX analog

Schema

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