Collecting Apache Solr™ performance statistics

Enable the solr_latency_snapshot_options parameter in dse.yaml and set the other options as required.

When solr_latency_snapshot_options is enabled, the performance service creates the required tables and schedules the job to periodically update the relevant snapshot from the specified data source.

The following snapshots collect performance statistics:

Query latency snapshot
Record phase-level cumulative percentile latency statistics for queries over time.
Update latency snapshot
Record phase-level cumulative percentile latency statistics for updates over time.
Commit latency snapshot
Record phase-level cumulative percentile latency statistics for commits over time.
Merge latency snapshot
Record phase-level cumulative percentile latency statistics for index merges over time.

All objects are disabled by default.

dse.yaml

The location of the dse.yaml file depends on the type of installation:

Package installations	/etc/dse/dse.yaml
Tarball installations	`installation_location`/resources/dse/conf/dse.yaml

Procedure

Edit the dse.yaml file.

In the dse.yaml file, under the solr_latency_snapshot_options parameter, change enabled to true and set the other options as required.

# Solr latency snapshot options
solr_latency_snapshot_options:
    enabled: true
    ttl_seconds: 604800
    refresh_rate_ms: 60000

All objects are disabled by default.

Table 1. Options
Options	Determines
enabled	Whether the object is enabled at start up.
ttl_seconds	How many seconds a record survives before it is expired from the performance object.
refresh_rate_ms	Period (in milliseconds) between sample recordings for periodically updating statistics like the solr_result_cache_stats.