We were running Solr 4.2, and are in the process of upgrading. I believe that
the particular scenario that was clogging our queue was resolved in 4.7.1 -
https://issues.apache.org/jira/browse/SOLR-5811
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http://lucene.472066.n3.nabble.com/overseer-queue-clogged-tp
I saw an overseer queue clogged as well due to a bad message in the queue.
Unfortunately this went unnoticed for a while until there were 130K messages
in the overseer queue. Since it was a production system we were not able to
simply stop everything and delete all Zookeeper data, so we manually de
