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https://issues.apache.org/jira/browse/SOLR-12338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16475965#comment-16475965
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Cao Manh Dat commented on SOLR-12338:
-------------------------------------

Interesting result, when I change from {{SetBlockingQueue}} to guava Striped 
class (its implementation is like an array of lock). The performance is 
decreased (from 4341ms to 8227ms), if I increase the number of stripes (size of 
the lock array) to {{numThreads * 1000}}, they will eventually run in the same 
amount of time.  It is a sign that collision does affect the performance!

> 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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