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https://issues.apache.org/jira/browse/SOLR-5865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13942015#comment-13942015
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Mark Miller commented on SOLR-5865:
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Hmm - nope, I can still see something. It's just becoming rarer. I think this
one is from threads leaking past the end of the test. The test framework has a
linger for this and attempted interrupts (linger has shown to be especially
important for zk tests, which has threads that can seem to linger for a while
after shutdown).
> Provide a MiniSolrCloudCluster to enable easier testing
> -------------------------------------------------------
>
> Key: SOLR-5865
> URL: https://issues.apache.org/jira/browse/SOLR-5865
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Affects Versions: 4.7, 5.0
> Reporter: Gregory Chanan
> Assignee: Mark Miller
> Attachments: SOLR-5865.patch, SOLR-5865.patch, SOLR-5865addendum.patch
>
>
> Today, the SolrCloud tests are based on the LuceneTestCase class hierarchy,
> which has a couple of issues around support for downstream projects:
> - It's difficult to test SolrCloud support in a downstream project that may
> have its own test framework. For example, some projects have support for
> different storage backends (e.g. Solr/ElasticSearch/HBase) and want tests
> against each of the different backends. This is difficult to do cleanly,
> because the Solr tests require derivation from LuceneTestCase, while the
> other don't
> - The LuceneTestCase class hierarchy is really designed for internal solr
> tests (e.g. it randomizes a lot of parameters to get test coverage, but a
> downstream project probably doesn't care about that). It's also quite
> complicated and dense, much more so than a downstream project would want.
> Given these reasons, it would be nice to provide a simple
> "MiniSolrCloudCluster", similar to how HDFS provides a MiniHdfsCluster or
> HBase provides a MiniHBaseCluster.
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