On 9/6/2016 12:03 AM, cuizhaohua wrote: > My env is 3 zookeeper server, 10 node of solrcloud. one of my collections > with 5 shard, and each one have two cores. > > > On web UI. I was via "core admin" unload a core . and now ,I want add or > reload the core via "Add Core" > > name: > instanceDir: > dataDir: > config: > schema: > collection: > shard: > > how can I confirm the " config: " and " schema: " input field.
The CoreAdmin API should *not* be used when you're running SolrCloud. Your cloud may now be in a delicate state, and recovery will not be entirely straightforward. The config and schema parameters are rarely needed for CoreAdmin. The minimum that you need for SolrCloud when using the CoreAdmin API is name, collection, and shard. These are usually the only parameters you'll need. However ... I must repeat what I said above: When you are in cloud mode, do NOT use CoreAdmin. In cloud mode, it is an expert option that can easily get you into a bad state. I would even call it an expert option when running in standalone mode. Exactly what you will need to do right now depends on whether you asked Solr to delete the instanceDir and/or dataDir when you unloaded the core. If you did not ask Solr to delete the instanceDir when you unloaded the core, you will find that core.properties has been renamed something like core.properties.unloaded ... if you rename the file back to core.properties and restart Solr, then the core will be back. If there are additional replicas in the cloud for that shard, then the core will be brought back into sync with the rest of the cloud, and everything will be fine. If you DID ask Solr to delete the instanceDir, then hopefully there are additional replicas of that shard, so you can use the ADDREPLICA action on the Collections API to build another replica. If the core that you deleted was the only copy of that shard, then deleting the collection entirely and recreating it might be your only good option for proper operation. https://cwiki.apache.org/confluence/display/solr/Collections+API#CollectionsAPI-api_addreplica I know a little bit about how to use CoreAdmin properly in cloud mode, but it's best to simply avoid using it entirely, and only use the Collections API. Thanks, Shawn
