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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-4221) Custom sharding
Date Tue, 02 Jul 2013 16:17:21 GMT

    [ https://issues.apache.org/jira/browse/SOLR-4221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13697930#comment-13697930
] 

Yonik Seeley commented on SOLR-4221:
------------------------------------

bq. does it also mean if ever the no:of replicas fall below the 'minReplicas' , write ops
would fail?

I was considering it only as a create-time parameter (not persisted), and had originally thought
about a parameter on updates that could specify the required replication level for safety.
 But we really need to think about all the use-cases we can up front - it could make sense
to have additional persisted properties around replicationFactor.

One use case is expanding your search capacity dynamically by simply starting up new nodes
that automatically become replicas of existing shards.  This is the current behavior today.
 We need to think about if/how to handle this use case when we start persisting replicationFactor
and if the overseer will destroy nodes to bring things back to the replication factor.  One
way would be to set the replicationFactor really high (to prevent this distruction), but this
could lead to other negatives such as a future GUI displaying the status of the collection
as degraded since the replicationFactor isn't met. Requiring the user to bump the replicationFactor
up before adding new nodes isn't the friendliest thing given that this will be a very common
use case.


                
> Custom sharding
> ---------------
>
>                 Key: SOLR-4221
>                 URL: https://issues.apache.org/jira/browse/SOLR-4221
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Yonik Seeley
>            Assignee: Noble Paul
>         Attachments: SOLR-4221.patch
>
>
> Features to let users control everything about sharding/routing.

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