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From "Scott Blum (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SOLR-6760) New optimized DistributedQueue implementation for overseer
Date Tue, 11 Aug 2015 21:48:46 GMT

     [ https://issues.apache.org/jira/browse/SOLR-6760?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Scott Blum updated SOLR-6760:
-----------------------------
    Attachment: SOLR-6760.patch

New patch, with better testing.  Tests all passing, I think.

> 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: Noble Paul
>         Attachments: 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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