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https://issues.apache.org/jira/browse/SOLR-2765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123357#comment-13123357
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Mark Miller commented on SOLR-2765:
-----------------------------------
Away for the weekend, and a lot to comment on, but will have to wait.
FYI though:
bq. current implementation on trunk polls the state every 5 seconds for updates
instead of using watchers.
I don't think so? It's been some time since I did this, but it should be using
a watcher - the 5 seconds is just how long it should wait before actually
grabbing the state - the idea being if node after node comes up and triggers
the watch, if there is already a state update scheduled (5 seconds after the
watch is triggered by default), a new update is not asked for - eg if nodes are
firing up by the hundreds, the state is still only updated once every 5
seconds. It's still triggered by a watch though - I believe a watch on the
shards node itself - which a core will ping with a set null data after
registering in zk. Before adding the incremental update patch, the idea was
that you could change a sub property on a node, and still trigger a reload of
the state by triggering the watches on the shards node.
> 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, shard-roles.patch
>
>
> Need state for shards that indicate they are recovering, active/enabled, or
> disabled.
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