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https://issues.apache.org/jira/browse/SOLR-4114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510504#comment-13510504
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Jack Krupansky commented on SOLR-4114:
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Definition of integration testing: A process where you spend 75% to 95% of your
time (and the time of people tracking down test failures) GUESSING what numbers
to use for sleeps.
I am a fan of integration testing, but it should be used as an adjunct, not a
replacement for hard-core unit testing.
Solr is screaming out for a "mocking" capability so that more "integration"
testing can be done at the unit test level. Mocking can also improve testing by
varying the characteristics of dependencies in a controlled manner rather than
have integration tests that test only a narrow range of characteristics that
vary between environments and over time in an unpredictable and non-repeatable
manner. I mean, it would be nice if we could develop components that were less
sensitive to changes in the performance of components that they depend on.
> Collection API: Allow multiple shards from one collection on the same Solr
> server
> ---------------------------------------------------------------------------------
>
> Key: SOLR-4114
> URL: https://issues.apache.org/jira/browse/SOLR-4114
> Project: Solr
> Issue Type: New Feature
> Components: multicore, SolrCloud
> Affects Versions: 4.0
> Environment: Solr 4.0.0 release
> Reporter: Per Steffensen
> Assignee: Per Steffensen
> Labels: collection-api, multicore, shard, shard-allocation
> Attachments: SOLR-4114.patch, SOLR-4114.patch, SOLR-4114.patch,
> SOLR-4114.patch, SOLR-4114_trunk.patch
>
>
> We should support running multiple shards from one collection on the same
> Solr server - the run a collection with 8 shards on a 4 Solr server cluster
> (each Solr server running 2 shards).
> Performance tests at our side has shown that this is a good idea, and it is
> also a good idea for easy elasticity later on - it is much easier to move an
> entire existing shards from one Solr server to another one that just joined
> the cluter than it is to split an exsiting shard among the Solr that used to
> run it and the new Solr.
> See dev mailing list discussion "Multiple shards for one collection on the
> same Solr server"
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