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From "Scott Blum (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-6760) New optimized DistributedQueue implementation for overseer
Date Wed, 12 Aug 2015 01:36:46 GMT

    [ https://issues.apache.org/jira/browse/SOLR-6760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14692748#comment-14692748
] 

Scott Blum commented on SOLR-6760:
----------------------------------

I did get ant test to pass, but the new test is flaky.  Any advice on making it less flaky?
 In particular, I want to force a ZK session drop and reconnect.  This code sometimes fails:

{quote}
    // Force session expiry.
    long sessionId = zkClient.getSolrZooKeeper().getSessionId();
    zkServer.expire(sessionId);
    zkClient.getConnectionManager().waitForDisconnected(10000);
    zkClient.getConnectionManager().waitForConnected(10000);
    assertTrue(zkClient.isConnected());
    assertFalse(sessionId == zkClient.getSolrZooKeeper().getSessionId());
{quote}




> 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, 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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