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From "Scott Blum (JIRA)" <>
Subject [jira] [Commented] (SOLR-6760) New optimized DistributedQueue implementation for overseer
Date Sat, 22 Aug 2015 17:14:45 GMT


Scott Blum commented on SOLR-6760:

Gregory, glad you're thinking about this.  This kind of discussion is just what I was hoping
for when I wrote "I think someone should go back and analyze the true needs there and figure
out if there's something better we can do." :)

> New optimized DistributedQueue implementation for overseer
> ----------------------------------------------------------
>                 Key: SOLR-6760
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>          Components: SolrCloud
>            Reporter: Noble Paul
>            Assignee: Shalin Shekhar Mangar
>             Fix For: Trunk, 5.4
>         Attachments: SOLR-6760-branch_5x.patch, 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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