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https://issues.apache.org/jira/browse/SOLR-6760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14704564#comment-14704564
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Ramkumar Aiyengar commented on SOLR-6760:
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In the output above, 'success' new way is 3 instead of 20k, some test bug?
> New optimized DistributedQueue implementation for overseer
> ----------------------------------------------------------
>
> Key: SOLR-6760
> URL: https://issues.apache.org/jira/browse/SOLR-6760
> Project: Solr
> Issue Type: Bug
> Reporter: Noble Paul
> Assignee: Shalin Shekhar Mangar
> Attachments: SOLR-6760.patch, SOLR-6760.patch, SOLR-6760.patch,
> SOLR-6760.patch, deadlock.patch
>
>
> Currently the DQ works as follows
> * read all items in the directory
> * sort them all
> * take the head and return it and discard everything else
> * rinse and repeat
> This works well when we have only a handful of items in the Queue. If the
> items in the queue is much larger (in tens of thousands) , this is
> counterproductive
> As the overseer queue is a multiple producers + single consumer queue, We can
> read them all in bulk and before processing each item , just do a
> zk.exists(itemname) and if all is well we don't need to do the fetch all +
> sort thing again
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