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Posted to dev@lucene.apache.org by "Sami Siren (Updated) (JIRA)" <ji...@apache.org> on 2011/11/24 14:20:40 UTC
[jira] [Updated] (SOLR-2880) Investigate adding an overseer that
can assign shards, later do re-balancing, etc
[ https://issues.apache.org/jira/browse/SOLR-2880?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sami Siren updated SOLR-2880:
-----------------------------
Attachment: SOLR-2880.patch
This patch implements a simple overseer (cluster leader). Currently it does not do more than assign shard ids to cores so there is no added functionality. I wanted to post what I currently have here to get some feedback and improvement ideas.
Two new top level zkNodes are created:
/node_assignments
/node_states
Basically the integration point is the ZKController:
When a core is registered its state is registered locally and nodes current state is published under /node_states
When overseer assigns a shard id the state is stored locally (to overseer) and the assignments for the node are published under /node_assignments.
Overseer gets the number of shards required for a collection from the collections properties in ZK. So if you wanted to add a new collection you'd create a new collection node and record the required number of shards (among other things like the used configuration) into its properties.
Even if a node hosts multiple cores it only creates single node (/node_states/<id>) and reads a single node (/node_assignments/<id>). It might be simpler to have multiple subnodes (one for each core)
> Investigate adding an overseer that can assign shards, later do re-balancing, etc
> ---------------------------------------------------------------------------------
>
> Key: SOLR-2880
> URL: https://issues.apache.org/jira/browse/SOLR-2880
> Project: Solr
> Issue Type: Sub-task
> Components: SolrCloud
> Reporter: Mark Miller
> Assignee: Mark Miller
> Fix For: 4.0
>
> Attachments: SOLR-2880.patch
>
>
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