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https://issues.apache.org/jira/browse/SOLR-2765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13125232#comment-13125232
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Mark Miller commented on SOLR-2765:
-----------------------------------

One thing we probably want to consider are the limitations we might hit as this 
XML file grows. EG - at some point, is grabbing a 800k file on every update 
going to be a lot worse than incremental updates against zknodes? Are we going 
to be okay with a max limit of nodes in the low 1000's? (Zk max file size is 1 
MB - is that overridable without hacking a version?). We will likely add more 
meta data to each node over time.

Also, should we consider JSON or YAML over XML? Solr has historically used XML 
for config, but I don't want that to unduly influence the right choice here. 
Solr also has JSON support (which I would like as better default for talking to 
Solr myself).
                
> 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: cluster_state-file.patch, combined.patch, 
> incremental_update.patch, scheduled_executors.patch, shard-roles.patch, 
> solrcloud.patch
>
>
> Need state for shards that indicate they are recovering, active/enabled, or 
> disabled.

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