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From "Weiwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8521) NPE in AllocationTagsManager when a container is removed more than once
Date Fri, 13 Jul 2018 02:44:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16542435#comment-16542435
] 

Weiwei Yang commented on YARN-8521:
-----------------------------------

Fix the UT failure by using different container IDs in the test class.

> NPE in AllocationTagsManager when a container is removed more than once
> -----------------------------------------------------------------------
>
>                 Key: YARN-8521
>                 URL: https://issues.apache.org/jira/browse/YARN-8521
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 3.1.0
>            Reporter: Weiwei Yang
>            Assignee: Weiwei Yang
>            Priority: Major
>         Attachments: YARN-8521.001.patch, YARN-8521.002.patch
>
>
> We've seen sometimes there is NPE in AllocationTagsManager
> {code:java}
> private void removeTagFromInnerMap(Map<String, Long> innerMap, String tag) {
>   Long count = innerMap.get(tag);
>   if (count > 1) { // NPE!!
>   ...
> {code}
> it seems {{AllocationTagsManager#removeContainer}} somehow gets called more than once
for a same container.



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