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https://issues.apache.org/jira/browse/SOLR-9908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15800767#comment-15800767
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Mikhail Khludnev commented on SOLR-9908:
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Thanks for reminding, [~arafalov]! It seems that running dih out-of-process 
takes too much implemntation efforts. This issue aims low hanging cloud writer 
only. It might be, SOLR-7188 has DIHCloudWriter, thus I just extract it and put 
here.

> create SolrCloudDIHWriter to speedup DataImportHandler on SolrCloud
> -------------------------------------------------------------------
>
>                 Key: SOLR-9908
>                 URL: https://issues.apache.org/jira/browse/SOLR-9908
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Mikhail Khludnev
>
> Right now if DIH is invoked in SolrCloud it feeds docs one by one 
> synchronously via {{DistributedUpdateProcessor}}.  
> It's proposed to create {{DIHWriter}} implementation which will stream docs 
> with {{SolrCloudClient}}. I expect per-shard parallelism and even more with 
> {{CloudSolrClient.setParallelUpdates(true)}}.
> What's your feeling about it? 



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