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https://issues.apache.org/jira/browse/SOLR-5213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13866565#comment-13866565
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Ramkumar Aiyengar commented on SOLR-5213:
-----------------------------------------

Shalin, any objection to this patch going in? May be with SOLR-5338, the 
severity of the 0 shard case can be reduced from log.error, but the patch 
should good otherwise..

> collections?action=SPLITSHARD parent vs. sub-shards numDocs
> -----------------------------------------------------------
>
>                 Key: SOLR-5213
>                 URL: https://issues.apache.org/jira/browse/SOLR-5213
>             Project: Solr
>          Issue Type: Improvement
>          Components: update
>    Affects Versions: 4.4
>            Reporter: Christine Poerschke
>            Assignee: Shalin Shekhar Mangar
>         Attachments: SOLR-5213.patch
>
>
> The problem we saw was that splitting a shard took a long time and at the end 
> of it the sub-shards contained fewer documents than the original shard.
> The root cause was eventually tracked down to the disappearing documents not 
> falling into the hash ranges of the sub-shards.
> Could SolrIndexSplitter split report per-segment numDocs for parent and 
> sub-shards, with at least a warning logged for any discrepancies (documents 
> falling into none of the sub-shards or documents falling into several 
> sub-shards)?
> Additionally, could a case be made for erroring out when discrepancies are 
> detected i.e. not proceeding with the shard split? Either to always error or 
> to have an verifyNumDocs=false/true optional parameter for the SPLITSHARD 
> action.



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