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
