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https://issues.apache.org/jira/browse/SOLR-3755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13445376#comment-13445376
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Uwe Schindler commented on SOLR-3755:
-------------------------------------
{code}
// TODO: will many deletes have been removed, or should we optimize?
{code}
The merged indexes will have no deletions at all, because it *merges* not
copies. IndexWriter.addIndexes(IndexReader...) does the same like a standard
Lucene merge, IndexWriter.addIndexes(Directory) just copies the segment files.
This is a plain stupid merge of a segment that has additional, overlaid
deletions.
> shard splitting
> ---------------
>
> Key: SOLR-3755
> URL: https://issues.apache.org/jira/browse/SOLR-3755
> Project: Solr
> Issue Type: New Feature
> Components: SolrCloud
> Reporter: Yonik Seeley
> Attachments: SOLR-3755.patch, SOLR-3755.patch
>
>
> We can currently easily add replicas to handle increases in query volume, but
> we should also add a way to add additional shards dynamically by splitting
> existing shards.
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