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https://issues.apache.org/jira/browse/SOLR-1331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12742355#action_12742355
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Shalin Shekhar Mangar commented on SOLR-1331:
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bq. IndexWriter.addIndexes() doesn't require this does it?
It does. The javadocs for IndexWriter.addIndexesNoOptimize say:
{quote}
The index in each Directory must not be changed (opened by a writer) while this
method is running. This method does not acquire a write lock in each input
Directory, so it is up to the caller to enforce this.
{quote}
We can choose to leave this upto the user of the API or we can try to prevent
it ourselves.
> Support merging multiple cores
> ------------------------------
>
> Key: SOLR-1331
> URL: https://issues.apache.org/jira/browse/SOLR-1331
> Project: Solr
> Issue Type: New Feature
> Components: update
> Reporter: Shalin Shekhar Mangar
> Fix For: 1.5
>
>
> There should be a provision to merge one core with another. It should be
> possible to create a core, add documents to it and then just merge it into
> the main core which is serving requests. This way, the user will not need to
> know the filesystem as it is needed for SOLR-1051
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