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https://issues.apache.org/jira/browse/SOLR-4492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13584936#comment-13584936
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Hoss Man commented on SOLR-4492:
--------------------------------
poorly thought through suggestion from the peanut gallery...
* it seems like picking the leaders on collection creation should use the same
algo as leader election when a leader goes down
* instead of picking leaders purely randomly, it seems like the leader election
algo could be a lottery, with the number of tickets each node has inversely
proportionate to the amount of "load" that node is handling
* "load" could be an generic numeric concept contributed by various things
along the lines of "(num_local_shards + (17 * num_shards_we_are_leader_for) +
$some_admin_configurable_property) *
OperatingSystemMXBean.html.getAvailableProcessors() /
OperatingSystemMXBean.html.getSystemLoadAverage()"
(where "$some_admin_configurable_property" gives users the ability to say "this
machine is N times beefier then that machine")
> Please add support for Collection API CREATE method to evenly distribute
> leader roles among instances
> -----------------------------------------------------------------------------------------------------
>
> Key: SOLR-4492
> URL: https://issues.apache.org/jira/browse/SOLR-4492
> Project: Solr
> Issue Type: New Feature
> Components: SolrCloud
> Reporter: Tim Vaillancourt
>
> Currently in SolrCloud 4.1, a CREATE call to the Collection API will cause
> the server receiving the CREATE call to become the leader of all shards.
> I would like to ask for the ability for the CREATE call to evenly distribute
> the leader role across all instances, ie: if I create 3 shards over 3 SOLR
> 4.1 instances, each instance/node would only be the leader of 1 shard.
> This would be logically consistent with the way replicas are randomly
> distributed by this same call across instances/nodes.
> Currently, this CREATE call will cause the server receiving the call to
> become the leader of 3 shards.
> curl -v
> 'http://<HOST>:8983/solr/admin/collections?action=CREATE&name=test&numShards=3&replicationFactor=2&maxShardsPerNode=2'
> PS: Thank you SOLR developers for your contributions!
> Tim Vaillancourt
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