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https://issues.apache.org/jira/browse/USERGRID-408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14332341#comment-14332341
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John D. Ament commented on USERGRID-408:
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Hey Todd
I read through your forum post, and coming out of the elasticsearch
battlegrounds, I think you might be confusing shards and replicas.
The shard is a logical separation of indexed data across an index. If your
index is lets say 1gb in size, that might be too big to process, so splitting
the index across 3 333MB shards is an option to avoid loading the whole thing
into memory at once.
A replica is how many copies of that data you want around. The default replica
count is 2, depending on cluster size.
I think in the structure you're describing, you want 1 shard and 6 replicas,
not 6 shards.
> Create a shard balance system
> -----------------------------
>
> Key: USERGRID-408
> URL: https://issues.apache.org/jira/browse/USERGRID-408
> Project: Usergrid
> Issue Type: Story
> Reporter: Todd Nine
>
> Currently when an index is created, it should have the same number of shards
> as ES nodes with replica's. Since we sometimes do not allocate replicas, we
> need to ensure that primary shards are evenly distributed among our nodes.
> If this can't be fixed with ES settings, we will need to create an api
> function that evenly balances primary and replica shards across the cluster
> per index. See this forum post.
> https://groups.google.com/forum/#!topic/elasticsearch/9Hb5CJJ5Vj0
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