Hello, I'm trying to figure out if this is an issue or I'm doing something wrong. Basically, with Solr 6.6.1 running on HDFS (Hadoop 2.7.4), I see that if I create a one-shard collection with replicationFactor=1 (on one node), then add a second node, it creates a new replica on this new node. I thought this isn't expected, and that Solr will only try to keep the number of replicas according to replicationFactor.
Here are some reproducing steps: - have HDFS set up according to https://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-common/SingleCluster.html#Pseudo-Distributed_Operation - have Solr 6.6.1 downloaded and extracted - I also have a Zookeeper set up separately, if it matters (just extracted and started) - then, start Solr like bin/solr start -c -Dsolr.directoryFactory=HdfsDirectoryFactory -Dsolr.lock.type=hdfs -Dsolr.hdfs.home=hdfs://localhost:9000/solr - upload a config and create a collection: bin/solr zk upconfig -n hdfs -d ./server/solr/configsets/data_driven_schema_configs/conf -z localhost:2181 curl "http://localhost:8983/solr/admin/collections?action=CREATE&name=hdfs1&numShards=1&replicationFactor=1&autoAddReplicas=true&collection.configName=hdfs"; - add a document (again, it shouldn't matter) - start a second node (I copied the whole extracted Solr, just in case): bin/solr start -c -p 8984 -z localhost:2181 -Dsolr.directoryFactory=HdfsDirectoryFactory -Dsolr.lock.type=hdfs -Dsolr.hdfs.home=hdfs://localhost:9000/solr At this point I have two replicas of my shard (one on each node). Am I missing something or is this a bug? Maybe replicationFactor=1 is an edge case? Best regards, Radu -- Performance Monitoring * Log Analytics * Search Analytics Solr & Elasticsearch Support * http://sematext.com/
