Query quotas can be used in order to limit the amount of CPU, memory, and I/O resources any one user can use when searching. Usage is tracked continuously as queries are executed. Whenever a user exceeds their quota, the query is stopped and the user is notified. As long as the quota is exceeded, any new queries will be rejected as soon as they are initiated.
Quotas can be specified in a number of different time intervals in order to allow the Cluster Administrator to protect against both short-term accidental heavy queries and longer term general heavy queries.
It's possible to specify three different types of quotas based on how Cluster Administrators want to limit users: static cost points, live cost points, and query counts.
Cost points are the unit LogScale uses to schedule, limit, and monitor queries. A cost point is a combination of both the memory and CPU consumption that a query has, and can be used as measurement of how expensive a query is overall.
Cost points are divided into static and live, reflecting the nature of the query. If the query only concerns itself with existing historic data, its static cost point measures the amount of cost points spent on processing historic data. The cost points for a live query include, in addition to the static cost points, measurement of how expensive it is to run live updates for the query.
This quota can be used to limit the number of queries that can be executed within each time interval. This can be useful if you find that users are executing too many queries, as there is an inherent cost to starting and coordinating a query that isn't included in cost points.
To configure query quotas, you currently must have
root authorization. Later, we expect to have
specific permissions that can be used to more precisely specify who
can manage query quotas.
You will find the query quota settings page under Administration -->--> Query. There, you can configure default settings or user overrides.
Default settings apply to all users of the LogScale cluster.
Query quotas can be specified on a per user basis by using the User Override tab in the Query Quota UI. Overrides are done per quota type and time interval which means that any default quotas specified on any other combination of quota type and time interval still apply to the user. If you wish to remove a default quota restriction entirely for a particular user you can do a user override for that user and configure the override to be an unlimited quota.