We have a Solrcloud environments that have 4 solr nodes and a 3 node
Zookeeper ensemble. All of the collections are configured to have 2 shards
with 2 replicas. In this environment we have 14 different collections. Some
of these collections are hardly touched others have a fairly heavy search
and update load.
1 collection his near real time updates every minutes and constant
searches, but it is not very large
another has a fairly constant search load with updates of a few records
every 15 minutes. 6 collections are search heavy but update light (1 full
load per week with daily partials)

Updates to production cloud are via CDCR from an "authoring" cloud which
replicates to two production clouds.
We often see issues with replicas not being updated, and tlogs accumulating.

We have autoCommit and autoSoftCommit set on all our collections, and CDCR
logs disabled. We are running Solr 6.2

We also run into errors saying that "no live solr Servers available to
 service the request" but all nodes appear healthy. So I've been wondering
if we just have too many collections for the number of nodes.

Are there tell tale diagnostics that could determine if the servers are
over loaded?

Are there any guidelines for number of collections vs number of nodes in a

We run our zookeepers via supervisord, and all of this is behind firewalls.
So the Zookeeper JMX interface is useless. How do we get good diagnostics
from Zookeeper? I know that sometimes problems go away when we restart the
Zookeepers and the solr nodes.



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