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https://issues.apache.org/jira/browse/SOLR-5474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13973147#comment-13973147
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Mark Miller commented on SOLR-5474:
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bq. SOLR-5474: Have a new mode for SolrJ to support stateFormat=2
I don't fully understand the CHANGES entry for this. Really, we should say
CloudSolrServer, not SolrJ?
Also, stateFormat=2 means that clusterstate.json is split out by collection
right? And support for that is in ZkStateReader, which SolrJ uses.
Does this issue give SolrCloud support for stateFormat=2, or does it add a new
mode of operation where watchers are not used to monitor zk state?
> Have a new mode for SolrJ to support stateFormat=2
> --------------------------------------------------
>
> Key: SOLR-5474
> URL: https://issues.apache.org/jira/browse/SOLR-5474
> Project: Solr
> Issue Type: Sub-task
> Components: SolrCloud
> Reporter: Noble Paul
> Assignee: Noble Paul
> Fix For: 5.0
>
> Attachments: SOLR-5474.patch, SOLR-5474.patch, SOLR-5474.patch
>
>
> 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 , version (example \_stateVer=xcoll:34) . A node would throw
> an error (INVALID_NODE) if it does not have the right version
> If SolrJ gets INVALID_NODE error it would invalidate the cache and fetch
> fresh state information for that collection (and caches it again)
> If there is a connection timeout, SolrJ assumes the node is down and re-fetch
> the state for the collection and try again
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