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https://issues.apache.org/jira/browse/SOLR-2765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13122277#comment-13122277
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Jamie Johnson commented on SOLR-2765:
-------------------------------------

Yeah 100% agree.  The current implementation of update doesn't check to see if 
the data in the node changed, you'd need a watcher on each node to do that.  
The other project that I'm working on does just that.  We create a watcher on 
/live_nodes to track the list of available servers, we create a watch on the 
collection to see if a slice was added/removed, we create a watcher on each 
slice (not sure if that is the correct terminology) to check if a shard is 
added/removed and subsequently a watcher on each shard to track data changes.  
So lots of watchers all around.  

Would it be easier to store this information on the ephemeral nodes (under 
live_nodes)?  Then we only need a watcher for live_nodes (add/remove) and a 
watcher for each shard under live_nodes to see if their data changed.  I'm not 
sure what else is using the collection hierarchy (just query?), but perhaps 
would be a bit simpler.

                
> Shard/Node states
> -----------------
>
>                 Key: SOLR-2765
>                 URL: https://issues.apache.org/jira/browse/SOLR-2765
>             Project: Solr
>          Issue Type: Sub-task
>          Components: SolrCloud, update
>            Reporter: Yonik Seeley
>             Fix For: 4.0
>
>         Attachments: shard-roles.patch
>
>
> Need state for shards that indicate they are recovering, active/enabled, or 
> disabled.

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