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From Avery Ching <ach...@apache.org>
Subject Re: Some giraph implementation questions..
Date Sun, 17 Jun 2012 08:03:48 GMT
On 6/16/12 10:54 PM, prasenjit mukherjee wrote:
> 1. Is it the master who  ensures that sendToNeighbours() call actually
> succeeds Or it is entirely done by the underlying  hadoop RPC ?
Prior to the checkpoint, all messages must be guaranteed to be sent and 
delivered by all clients.

> 2. Is it possible that a single errant worker ( hadoop mapper ) can
> delay the completion of a single superstep ?
Yes.  This is possible, especially in skewed distributions.

> 3. While running giraph I saw 1 master_zookeper and 3 workers. Does it
> mean that in default config zookeper runs on master mapper ?

Yes.  Currently, the master thread and zookeeper service runs on the 
same mapper.

> -Thanks,
> Prasenjit


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