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https://issues.apache.org/jira/browse/SOLR-11988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16366441#comment-16366441
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Hoss Man commented on SOLR-11988:
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I should also point out: there's nothing particularly special about why this
failure manifests itself in FullSolrCloudDistribCmdsTest. In that particular
test, it's very likelye to happen because "collection2" is created w/a really
high number of SolrCores, so i'ts just a percentage game. Any other test (that
does not override the MockDirectoryFactory default) can just as easily surface
a similar looking failure.
> MockDirectoryFactory.exists() behaves diff then other impls -- can cause
> FullSolrCloudDistribCmdsTest failures due to SolrCore.initIndex incorrectly
> thinking index directory for brand new SolrCores already exist?
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-11988
> URL: https://issues.apache.org/jira/browse/SOLR-11988
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Hoss Man
> Assignee: Hoss Man
> Priority: Major
> Attachments: SOLR-11988.patch, SOLR-11988_nocommit_logging.patch,
> log.txt
>
>
> There's been quite a few jenkins failures from FullSolrCloudDistribCmdsTest
> that all seem to follow a similar pattern:
> * Failure manifests as "Could not find collection:collection2"
> * Failing seeds _frequently_ reproduce, but aren't guaranteed to
> * Root cause can be traced back to the collection creation failing because
> one of more replica cores failed due to the brand new (Solr)IndexWriter
> expects to find an existing segments file
> ** SolrCore should have already created an (empty) index in
> {{SolrCore.initIndex(...)}}
> ** The fact that the {{SolrIndexWrite}} throws this exception in it's
> constructor suggests that the earlier call to {{SolrCore.initIndex(...)}} is
> not functioning reliably
> ** Based on some experimenting i've done, it seems like the underlying
> problem is that in {{SolrCore.initIndex(...)}} the DirectoryFactory can "lie"
> about wether a directory already exists.
> More details to follow in comments.
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