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From "Sami Siren (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-3088) create shard placeholders
Date Wed, 08 Feb 2012 12:06:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13203503#comment-13203503
] 

Sami Siren commented on SOLR-3088:
----------------------------------

bq. the cluster should be self-describing so that one can start up a node and say "go join
this cluster"

Do you mean that the new node would automatically discover from the placeholders how many
cores it needs to start?

Now everything works just the opposite way: nodes create the cores they are configured to
do (solr.xml/CoreAdminHandler) and the overseer just assigns them a shard id as they come
in. I assume everything could still work this way when using the placeholders but it sounds
a bit awkward.

bq. I imagine the placeholders should be both in the ZK structure under /collections and in
clusterstate

What did you have in mind that should be stored under /collections?

In earlier versions I had overseer read the target number of slices from the collection node
(/collections/collection1 for example) but that was later removed in favor of the system property.

What should be in charge of creating a new collection? Now you can do it for example through
CoreAdminHandler by simply adding a core into a collection that does not yet exist, I believe
you can do this also through editing solr.xml.






                
> create shard placeholders
> -------------------------
>
>                 Key: SOLR-3088
>                 URL: https://issues.apache.org/jira/browse/SOLR-3088
>             Project: Solr
>          Issue Type: New Feature
>          Components: SolrCloud
>            Reporter: Yonik Seeley
>             Fix For: 4.0
>
>
> When creating a new collection, a placeholder for each shard should be created.

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