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From "Timothy Potter (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SOLR-5474) Have a new mode for SolrJ to not watch any ZKNode
Date Tue, 31 Dec 2013 20:09:50 GMT

     [ https://issues.apache.org/jira/browse/SOLR-5474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Timothy Potter updated SOLR-5474:
---------------------------------

    Attachment:     (was: SOLR-5474.patch)

> 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
>          Components: SolrCloud
>            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 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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