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From Josh Elser <>
Subject Re: questions regarding accumulo tracing
Date Thu, 13 Aug 2015 18:52:36 GMT
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.

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