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In this fourth and final part of the high availability series we will show you how to use SolrCloud together with Vidispine. In Part #1 we made a simple Vidispine cluster, in Part #2 we added HAProxy, and in Part #3 we added pgpool-II for a high availability database.
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How does SolrCloud work
In SolrCloud, a logical index is called a collection. A collection is split into a number of shards. Each shard contains a number of instances. One of them would be the leader of the shard, the others would be replicas. If a leader fails, one of the replicas would be elected as the new leader. And SolrCloud uses Zookeeper to maintain the distributed Solr instances.
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Hence, it is very important that there is no complete failure of a single shard, e.g. a shard that is not replicated, as the SolrCloud would not function, and there is no guarantee of index consistency.
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Installation and configuration
ZOOKEEPER
Download Zookeeper 3.4.6 from https://apache.mirrors.spacedump.net/zookeeper/zookeeper-3.4.6/ and unzip it.
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repeat above on your other solr servers.
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Running SolrCloud
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# Our Zookeeper is running at 10.185.20.100:2181 # On Instance 0: java -Dbootstrap_confdir=./solr/collection1/conf -Dcollection.configName=VidiConfigTest -DzkHost=10.185.20.100:2181 -DnumShards=2 -jar start.jar # On Instance 1: java -DzkHost=10.185.20.100:2181 -jar start.jar # On Instance 2: java -DzkHost=10.185.20.100:2181 -jar start.jar # On Instance 3: java -DzkHost=10.185.20.100:2181 -jar start.jar |
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For more info about SolrCloud, please refer to https://cwiki.apache.org/confluence/display/solr/SolrCloud
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SolrCloud test with docker
You can also test SolrCloud using this docker-compose env which sets up a ZooKeeper and SolrCloud instance, with numShards=2.
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