Data Collectors and Elections
A data collector is an in-memory database that maintains dynamic information about the servers in the zone, such as server loads, session status, published applications, users connected, and license usage.
Data collectors receive incremental data updates and queries from servers within their zone. Data collectors relay information to all other data collectors in the farm. The data collector tracks, for example, which applications are available and how many sessions are running on each server in the zone. The data collector communicates this information to the data store on behalf of the other servers in the farm. By default, in farms that communicate indirectly with the data store, the first server in the farm functions as the data collector.
Farms determine the data collector according to what level the election preference is set for a server. By default, all servers joining the farm are configured as backup data collectors. When the zone's data collector fails, a data collector election occurs and a backup data collector replaces the failed data collector.
If the data collector fails, existing and incoming sessions connected to other servers in the farm are not affected. The data collector election process begins automatically and a new data collector is elected almost instantaneously. Data collector elections are not dependent on the data store.
New Data Collector ElectionWhen communications fail between data collectors or between a server and its data collector, the process to choose or elect a new data collector begins. For example:Sometimes, you might decide to have a dedicated data collector after your farm is in production. In general, if users experience slow connection times due to high CPU utilization on the data collector, consider dedicating a server to act solely as the zone data collector.
Citrix does not support case-sensitive databases.To avoid corruption, do not directly edit data in the data store database with utilities or tools other than those provided by Citrix.
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