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https://issues.apache.org/jira/browse/SOLR-12338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16480089#comment-16480089
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Yonik Seeley commented on SOLR-12338:
-------------------------------------

{quote}This is a very costly/risky logic to handle reordered updates
{quote}
Indeed.  As an aside, my vote for the long term continues to be: "don't reorder 
updates between leader and replica" :)

> Replay buffering tlog in parallel
> ---------------------------------
>
>                 Key: SOLR-12338
>                 URL: https://issues.apache.org/jira/browse/SOLR-12338
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Cao Manh Dat
>            Assignee: Cao Manh Dat
>            Priority: Major
>         Attachments: SOLR-12338.patch, SOLR-12338.patch, SOLR-12338.patch
>
>
> Since updates with different id are independent, therefore it is safe to 
> replay them in parallel. This will significantly reduce recovering time of 
> replicas in high load indexing environment. 



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