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https://issues.apache.org/jira/browse/SOLR-4998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13699583#comment-13699583
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Otis Gospodnetic commented on SOLR-4998:
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bq. Slice: The higher level, logical representation.
But of what? :)
A Slice represents a set of shards: the leader shard + all its replicas in a
Collection.
{quote}
Collection has Slices
Slices have Shards
{quote}
And I thought it's:
# Cluster has Collections
# Collections are Logical Indices
# Collection has Shards
# Shards are Physical Indices
# A Shard can be a Leader or a Replica
# Leader/Replica are just Roles a Shard can have
# A Replica can become a Leader through election if previous Leader goes away
# Collection has Slices
# A Slice is a Logical Set of Shards containing the Leader + all its Replicas
# A Slice has as many Shards as the Collection's "numShards"
If this is right, it deserves a Wiki page.
If this is wrong, it needs a fix and then a Wiki page.
> Make the use of Slice and Shard consistent across the code and document base
> ----------------------------------------------------------------------------
>
> Key: SOLR-4998
> URL: https://issues.apache.org/jira/browse/SOLR-4998
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Affects Versions: 4.3, 4.3.1
> Reporter: Anshum Gupta
>
> The interchangeable use of Slice and Shard is pretty confusing at times. We
> should define each separately and use the apt term whenever we do so.
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