There are three "concepts" to grasp:
1. You can send Solr update requests to ANY node of the cluster. Period.
2. Any extra network traffic (within the cluster) is likely to be negligible
and absolutely not worrying about unless you have definitive evidence to the
contrary.
3. Leader nodes in SolrCloud are designed to be dynamic and will change over
time. Generally, you won't know which node is the leader for a shard at any
given moment - it may have been a particular node one milliscond ago, but
now maybe another node has been designated as the leader. Neither the
application nor the user designates which node is a leader for a shard - it
is a dynamic election process. Sure, you can check to see which node is
currently the leader, but one millisecond later some other node may have
gotten elected to be the leader.
To repeat, you DO NOT need to be concerned with sending Solr update requests
to a shard "leader". The SolrCloud concept of "leader" is really only needed
WITHIN the cluster. Clients outside of the SolrCloud cluster need not
concern themselves with shard "leaders."
"Micro-optimization" and "premature optimization" are very poor tools to
lead a system design. Focus the energy on the data modeling and the overall
application design.
-- Jack Krupansky
-----Original Message-----
From: vicky desai
Sent: Sunday, July 07, 2013 1:17 AM
To: solr-user@lucene.apache.org
Subject: Re: Is it possible to find a leader from a list of cores in solr
via java code
Hi Erik,
I just wanted to clarify if u got my concern right. If i send some documents
to the replica core wont it first have to send the documents to the leader
core which in turn would be sending it back to the replica cores. If yes
then this will lead to additional network traffic which can be avoided by
sending the documents directly to leader.
Please correct me if I have got the concept incorrect.Any help is
appreciated
Thanks,
Vicky
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