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https://issues.apache.org/jira/browse/SOLR-5473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14058880#comment-14058880
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Ramkumar Aiyengar commented on SOLR-5473:
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Got it.
I wouldn't say I am still convinced that caching till you fail is the same as
watching. There are still cases around (unfortunately not very reproduceable
enough to be fixed) the cluster state tells you for sure that some node is off
limits, but the actual request doesn't fail fast enough. More generally,
ideally I would like to be able to inform that for some reason a node shouldn't
be used for whatever environmental reason even though it physically is up (may
be it is doing something weird and I would like for it to be up and available
for debugging while not affecting queries). Currently that's not possible, but
something we might work to get added. It would be good to have the true ZK
state instead of lazily updating it on error.
bq. watching nodes is error prone unless we have clear rules on how to
watch/unwatch
That's why I am saying that at least in the simplistic case this should be left
to configuration -- watch none, all, or selected. That would at least open the
doors for more sophisticated logic on making the selection smarter, but we
shouldn't shut it out and require only caching to be used. Use the watch when
you have been told to, else cache..
> Split clusterstate.json per collection and watch states selectively
> --------------------------------------------------------------------
>
> Key: SOLR-5473
> URL: https://issues.apache.org/jira/browse/SOLR-5473
> Project: Solr
> Issue Type: Sub-task
> Components: SolrCloud
> Reporter: Noble Paul
> Assignee: Noble Paul
> Fix For: 5.0
>
> Attachments: SOLR-5473-74 .patch, SOLR-5473-74.patch,
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch,
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch,
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch,
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch,
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch,
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch,
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch,
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch,
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74.patch,
> SOLR-5473-74.patch, SOLR-5473-74.patch, SOLR-5473-74_POC.patch,
> SOLR-5473-configname-fix.patch, SOLR-5473.patch, SOLR-5473.patch,
> SOLR-5473.patch, SOLR-5473.patch, SOLR-5473.patch, SOLR-5473.patch,
> SOLR-5473.patch, SOLR-5473.patch, SOLR-5473.patch, SOLR-5473.patch,
> SOLR-5473.patch, SOLR-5473.patch, SOLR-5473.patch, SOLR-5473.patch,
> SOLR-5473.patch, SOLR-5473.patch, SOLR-5473.patch, SOLR-5473.patch,
> SOLR-5473_undo.patch, ec2-23-20-119-52_solr.log, ec2-50-16-38-73_solr.log
>
>
> As defined in the parent issue, store the states of each collection under
> /collections/collectionname/state.json node
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