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From Alexandre Drouin <>
Subject Getting "collection already exists" when creating collection in admin UI
Date Fri, 12 Aug 2016 14:05:08 GMT

I am running SolrCloud with 2 nodes (Solr 6.1 with SSL and basic auth) and with one Zookeeper
node (for development purposes) and when I try to create a new collection in the admin UI
with 'replicationFactor=2' I get a  "Connection to Solr lost" message and another message
telling me " collection already exists: MyNewNode".  I made sure that a collection with the
same name does not exists and the issue does not appear with a replication factor of 1.  

While debugging I saw that the create action is called twice with the following parameters:

Can anyone replicate this issue?  I have not found it in JIRA.

Below is the relevant log (if useful) and I posted the full logs here

63549 ERROR (OverseerThreadFactory-5-thread-5-processing-n:orc-dev-solr-cd.local:8444_solr)
[   ] o.a.s.c.OverseerCollectionMessageHandler Collection: MyNewNode operation: create failed:org.apache.solr.common.SolrException:
collection already exists: MyNewNode
	at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$22(
	at java.util.concurrent.ThreadPoolExecutor.runWorker(
	at java.util.concurrent.ThreadPoolExecutor$

Alexandre Drouin

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