k On May 16, 2012, at 5:35 AM, Per Steffensen wrote: > Hi > > We want to create a Solr config in ZK during installation of our product, but > we dont want to create any shards in that phase. We will create shards from > our application when it starts up and also automatically maintain the set of > shards from our application (which uses SolrCloud). The only way we know to > create a Solr config in ZK is to spin up a Solr with system properties > zkHost, bootstrap_confdir and collection.configName. Is there another, more > API-ish, way of creating a Solr config in ZK? > > Regards, Per Steffensen
I've started some work on this, but I have not finished. There is a main method in ZkController that has some initial code. Currently it just lets you upload a specifically named config set directory - I would also like to add the same multi core config set upload option we have on startup - where it reads solr.xml, finds all the config dirs and uploads them, and links each collection to a config set named after it. Technically, you could use any tool to set this up - there are a variety of options in the zk world - you just have to place the config files under the right node. There is one other tricky part though - the collection has to be set to the right config set name. This is specified on the collection node in ZooKeeper. When creating a new collection, you can specify this as a param. If none is set and there is only one config set, that one config set is used. However, some link must be made, and it is not done automatically with your initial collections in solr.xml unless there is only one config set. So now I'm thinking perhaps we should default the config set name to the collection name. Then if you simply use the collection name initially when you upload the set, no new linking is needed. If you don't like that, you can explicitly override what config set to use. Convention would be to name your config sets after your collection name, but extra work would allow you to do whatever you want. You can find an example of the ZkContoller main method being used in solr/cloud-dev scripts. The one caveat is that we pass an extra param to solrhome and briefly run a ZkServer within the ZkController#main method since we don't have an external ensemble. Normally this would not make sense and you would want to leave that out. I need to clean this all up (the ZkController params) and document it on the wiki as soon as I make these couple tweaks though. - Mark Miller lucidimagination.com
