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https://issues.apache.org/jira/browse/SOLR-5474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13973152#comment-13973152
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Noble Paul commented on SOLR-5474:
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bq.Really, we should say CloudSolrServer, not SolrJ?
we could
bq.And support for that is in ZkStateReader....
Yes, But ZkStateReader would fetch the collection details from ZK if it is nnot
a 'watched collectiion" . For a client watching a collection is not really an
option. SO the caching support is added outside of ZkStateReader and , right
into CLoudSolrServer
bq.Does this issue give CloudSolrServer support for stateFormat=2
Actually the user does not have to specify anything. CloudSolrServer would
automatically handle stateFormat=2 .
The definition of the ticket is slightly misleading ,because the original
design was different
> 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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