Merge latency snapshot
Record phase-level cumulative percentile latency statistics for index merges 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. |
JMX analog
com.datastax.bdp/search/<core>/MergeMetricsSee Merge metrics MBean.
Schema
CREATE TABLE dse_perf.solr_merge_latency_snapshot ( node_ip inet, core text, date timestamp, time timestamp, phase text, count bigint, latency_percentiles_micros map<text>, <bigint> PRIMARY KEY ((node_ip, core, date), phase, time) ) WITH CLUSTERING ORDER BY (phase ASC, time DESC) AND gc_grace_seconds=0
| Field | Type | Purpose |
|---|---|---|
node_ip |
inet |
Node IP address. |
core |
text |
Search core name, such as keyspace.table. |
date |
timestamp |
Midnight on the mm/dd/yyyy the snapshot was recorded. |
time |
timestamp |
Time the snapshot was recorded. |
phase |
text |
INIT, WARM, EXECUTE |
count |
bigint |
Cumulative number of queries recorded. |
latency_percentiles_micros |
map<text>, <bigint> |
Cumulative latency percentiles of query: 25%, 50%, 75%, 95%, 99% and 99.9%. |
Snapshots recorded on 10/17/2014 for core keyspace.table on the node 127.0.0.1:
SELECT * FROM solr_merge_latency_snapshot WHERE node_ip = '127.0.0.1' AND core = 'keyspace.table' AND date = '2014-10-17';
Most recent 5 snapshots for the EXECUTE phase recorded on 10/17/2014 for core keyspace.table`" on the node 127.0.0.1:
SELECT *
FROM solr_merge_latency_snapshot
WHERE node_ip = '127.0.0.1'
AND core = 'keyspace.table'
AND date = '2014-10-17'
AND phase = 'EXECUTE'
LIMIT 5;
Related information
