addition of a partition

Hi team,

I am reading this link:
https://cwiki.apache.org/confluence/display/KAFKA/Replication+tools#Replicationtools-5.AddPartitionTool
and this JIRA https://issues.apache.org/jira/i#browse/KAFKA-1030. I have a couple of questions.

After adding a partition by using the tool, should the consumer processes be restarted? If auto.offset.reset
is set to the largest for my consumer processes, will be it changed during partition addition? And is there
chance of message loss? Thanks.

Regards,

Libo