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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