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From "Mark Miller (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-2765) Shard/Node states
Date Sun, 09 Oct 2011 02:19:29 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123596#comment-13123596
] 

Mark Miller commented on SOLR-2765:
-----------------------------------

{quote}to do something like this though we'd need to have some leader which was responsible
for maintaining this state. Wouldn't this still result in a large amount of data being pulled
by the searchers for a very small change (i.e. 1 additional searcher being added). {quote}

Or, assuming state changes are infrequent, you just use optimistic locking and retries? Or
a state lock (though you probably want to avoid global locks if you can, I'm less worried
about that for something that will generally be stable I guess)? Even if the whole state was
an in XML file, I'm guessing it would be plenty faster though ... I would guess the real issue
is the request per node. I'd guess the description of a large cluster in one request would
be much faster than reading  a bit of data on 500 nodes.
                
> 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: incremental_update.patch, scheduled_executors.patch, shard-roles.patch
>
>
> Need state for shards that indicate they are recovering, active/enabled, or disabled.

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