Jeff Kubina wrote:
To collect traces, Accumulo needs at least one server listed in $ACCUMULO_HOME/conf/tracers. The server collects traces from clients and writes them to the trace table.1. Regarding the information above about accumulo tracing, if more than one server is listed in $ACCUMULO_HOME/conf/tracers how do the clients select the trace server to send their trace data to?
Tracers register themselves in ZooKeepers and the client tracing libraries know to look in ZooKeeper to find them. You as a user shouldn't have to worry about it -- it should happen automagically for you.
2. As an admin what is the best way to determine which tables have recently been traced?
I'm not entirely sure what you mean by "[tables that have been recently traced]". You can look at the "Recent Traces" page on the monitor to get a list of the traces in the last X minutes.
Many operations going on in Accumulo will be getting traced. If you have an active system, you'll constantly see new traces for minor compactions and major compactions.
