[jira] [Created] (SOLR-5474) Have a new mode for SolrJ to not watch any ZKNode

["Noble Paul (JIRA)" <ji...@apache.org>]

Noble Paul created SOLR-5474:
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             Summary: Have a new mode for SolrJ to not watch any ZKNode
                 Key: SOLR-5474
                 URL: https://issues.apache.org/jira/browse/SOLR-5474
             Project: Solr
          Issue Type: Sub-task
            Reporter: Noble Paul


In this mode SolrJ would not watch any ZK node

It fetches the state  on demand and cache the most recently used n collections in memory.

SolrJ would not listen to any ZK node. When a request comes for a collection ‘xcoll’
it would first check if such a collection exists
If yes it first looks up the details in the local cache for that collection
If not found in cache , it fetches the node /collections/xcoll/state.json and caches the information
Any query/update will be sent with extra query param specifying the collection name , shard name, Role (Leader/Replica), and range (example \_target_=xcoll:shard1:L:80000000-b332ffff) . A node would throw an error (INVALID_NODE) if it does not the serve the collection/shard/Role/range combo.
If a SolrJ gets INVALID_NODE error it would invalidate the cache and fetch fresh state information for that collection (and caches it again).




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