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From Olivier <>
Subject Large multivalued field and overseer problem
Date Thu, 19 Nov 2015 20:43:07 GMT

We have a Solrcloud cluster with 3 nodes (4 processors, 24 Gb RAM per node).
We have 3 shards per node and the replication factor is 3. We host 3
collections, the biggest is about 40K documents only.
The most important thing is a multivalued field with about 200K to 300K
values per document (each value is a kind of reference product of type
We have some very big issues with our SolrCloud cluster. It crashes
entirely very frequently at the indexation time. It starts with an overseer
issue :

Session expired de l’overseer : KeeperErrorCode = Session expired for

Then an another node is elected overseer. But the recovery phase seems to
failed indefinitely. It seems that the communication between the overseer
and ZK is impossible.
And after a short period of time, all the cluster is unavailable (out of
memory JVM error). And we have to restart it.

So I wanted to know if we can continue to use huge multivalued field with
We are on Solr 4.10.4 for now, do you think that if we upgrade to Solr 5,
with an overseer per collection it can fix our issues ?
Or do we have to rethink the schema to avoid this very large multivalued
field ?



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