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https://issues.apache.org/jira/browse/SOLR-1028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510931#comment-13510931
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Mark Miller commented on SOLR-1028:
-----------------------------------
Looking at the logs of the latest failure I found a bit (this is one of only 2
or 3 types of fails I've seen though)
It appears that it's trying to create the index for a new collection under the
existing collection1's data dir - I don't know if this is due to a race or
what, but it's obviously not supposed to be happening...
oasc.CoreContainer.recordAndThrow SEVERE Unable to create core: collectionLazy5
org.apache.solr.common.SolrException: Cannot create
Caused by: java.io.IOException: Cannot create directory:
C:\Users\JenkinsSlave\workspace\Lucene-Solr-trunk-Windows\solr\build\solr-core\test-files\solr\collection1\data\index
[junit4:junit4] 2> at
org.apache.lucene.store.NativeFSLock.obtain(NativeFSLockFactory.java:171)
> Automatic core loading unloading for multicore
> ----------------------------------------------
>
> Key: SOLR-1028
> URL: https://issues.apache.org/jira/browse/SOLR-1028
> Project: Solr
> Issue Type: New Feature
> Components: multicore
> Affects Versions: 4.0, 5.0
> Reporter: Noble Paul
> Assignee: Erick Erickson
> Fix For: 4.1, 5.0
>
> Attachments: SOLR-1028.patch, SOLR-1028.patch,
> SOLR-1028_testnoise.patch
>
>
> usecase: I have many small cores (say one per user) on a single Solr box .
> All the cores are not be always needed . But when I need it I should be able
> to directly issue a search request and the core must be STARTED automatically
> and the request must be served.
> This also requires that I must have an upper limit on the no:of cores that
> should be loaded at any given point in time. If the limit is crossed the
> CoreContainer must unload a core (preferably the least recently used core)
> There must be a choice of specifying some cores as fixed. These cores must
> never be unloaded
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