I have been recently facing an issue with the Collection Reload in a couple
of Solr Cloud clusters :

1) re-index a collection
2) collection happily working
3) trigger collection reload 
4) reload times out ( silently, no message in any of the Solr node logs)
5) no effect on the collection ( it still serves query)

If I restart, the collection doesn't start as it finds the write.lock in the
index.
Sometimes this even avoid the entire cluster to be restarted ( even if the
clusterstate.json actually shows only few collection down) and Solr is not
reachable.
Of course i can mitigate the problem just cleaning up the indexes and
restart (avoiding the reload in favor of just restarts in the future), but
this is annoying.

I index through the DIH and I use a DirectSolrSpellChecker .
Should I take a look into Zookeeper ? I tried to check the Overseer queues
and some other checks, not sure the best places to look though in there...

Could this be related ?[1] I don't think so, but I am a bit puzzled...

[1] https://issues.apache.org/jira/browse/SOLR-6246






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Alessandro Benedetti
Search Consultant, R&D Software Engineer, Director
Sease Ltd. - www.sease.io
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