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 maptext, 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 |
|---|---|---|
|
inet |
Node IP address. |
core |
text |
Search index name, such as |
date |
timestamp |
Midnight on the mm/dd/yyyy the snapshot was recorded. |
time |
timestamp |
Time the snapshot was recorded. |
phase |
text |
|
count |
bigint |
Cumulative number of queries recorded. |
|
maptext, 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;