On Fri, Apr 22, 2016 at 01:15:12PM +0100, 'Viktor Bachraty' via ganeti-devel 
wrote:
> Run these tests by master candidates only. In larger clusters, these
> test were effectively making a DoS attack on the master node.
> LUClusterVerify() calls node_verify on each node, that would run
> TCPPing on noded's port for everyone in the nodegroup + master ip. This
> was causing timeouts on the master node being unable to receive
> node_verify RPC. Reducing this test to master candidates can reduce the
> number of connections to noded on the master node by a factor of 8.
> 
> Signed-off-by: Viktor Bachraty <[email protected]>

LGTM

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