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From "Jonathan Hung (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6327) Removing queues from CapacitySchedulerQueueManager and ParentQueue should be done with iterator
Date Mon, 13 Mar 2017 20:08:41 GMT

    [ https://issues.apache.org/jira/browse/YARN-6327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15922852#comment-15922852
] 

Jonathan Hung commented on YARN-6327:
-------------------------------------

Hi [~Naganarasimha], this actually broke some stuff I was testing in YARN-5952, I believe
even with single threaded operation an iterator must be used if you want to remove elements
from a map within a loop (e.g. http://stackoverflow.com/questions/6092642/how-to-remove-a-key-from-hashmap-while-iterating-over-it).


> Removing queues from CapacitySchedulerQueueManager and ParentQueue should be done with
iterator
> -----------------------------------------------------------------------------------------------
>
>                 Key: YARN-6327
>                 URL: https://issues.apache.org/jira/browse/YARN-6327
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>            Reporter: Jonathan Hung
>            Assignee: Jonathan Hung
>         Attachments: YARN-6327.001.patch, YARN-6327.002.patch
>
>
> e.g. in {{CapacitySchedulerQueueManager}} {noformat}    for (Map.Entry<String, CSQueue>
e : existingQueues.entrySet()) {
>       String queueName = e.getKey();
>       if (!newQueues.containsKey(queueName)) {
>         existingQueues.remove(queueName);
>       }
>     }{noformat}



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