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From "Newman, Elise" <>
Subject RE: Accumulo and CDH4 -- "no tablet servers"
Date Wed, 10 Apr 2013 15:58:20 GMT
Okay, thanks!

From: Eric Newton []
Sent: Wednesday, April 10, 2013 8:57 AM
Subject: Re: Accumulo and CDH4 -- "no tablet servers"

One node for the GC, one for the monitor.  You can run multiple tracers, but it's very unlikely
that you will need to, unless you are running more than 1000 nodes and doing heavy tracing.

On most clusters, the master/gc/monitor/tracer all run on same node, usually with a zookeeper,


On Wed, Apr 10, 2013 at 11:50 AM, Newman, Elise <<>>
Also, how many machines are usually assigned the roles of gc, tracers, and monitor? Couldn't
find much about them (didn't see any mention of them in the configuration section of the documentation),
but I saw in the logs that my tservers were trying to connect to, so I replaced
localhost in conf/tracers with the master, which eliminated that 'connection refused' error.


From: Eric Newton [<>]
Sent: Tuesday, April 09, 2013 4:18 PM

Subject: Re: Accumulo and CDH4 -- "no tablet servers"

I don't think it is.

You can have multiple masters: they have a distributed election via zookeeper and the winner
does coordination and the losers wait for the winner to die.

Updates to the documentation are cheerfully accepted. :-)


On Mon, Apr 8, 2013 at 11:13 PM, David Medinets <<>>
> two entries in your conf/masters file
Does the documentation discuss what it means to have two masters in an Accumulo configuration?

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