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From Arcadius Ahouansou <>
Subject Cross DC SolrCloud anti-patterns in presentation shalinmangar/cross-datacenter-replication-in-apache-solr-6
Date Sat, 24 Jun 2017 08:14:18 GMT

This email is about the presentation at

On slides 6, 7 and 8, there are 3 anti-patterns.

It seems there are many interpretations.

Interpretation 1:

- On slide 6 and 7: Only 2 DC used, so the ZK quorum will not survive and
recover after 1 DC failure

- On slide 8: We have 3 DCs which OK for ZK.
But we have 6 ZK nodes.
This is a problem because ZK likes 3, 5, 7 ... odd nodes.

- Those rules are dictated by zookeeper and will apply when using any
system that rely on zookeeper such as Hadoop, Kafka, HBase, etc

Interpretation 2:

Any SolrCloud deployment with "Remote SolrCloud nodes" i.e. solrCloud not
in same DC as ZK is deemed an anti-pattern (note that DCs can be just a
couple of miles apart and could be connected by high speed network)

There are many more interpretations.

It would be interesting to know the correct interpretation.

Thank you very much.


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