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Posted to yarn-issues@hadoop.apache.org by "Weiwei Yang (JIRA)" <ji...@apache.org> on 2018/07/12 11:06:00 UTC
[jira] [Commented] (YARN-8521) NPE in AllocationTagsManager when a
container is removed more than once
[ https://issues.apache.org/jira/browse/YARN-8521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16541472#comment-16541472 ]
Weiwei Yang commented on YARN-8521:
-----------------------------------
Here is a patch to get rid of NPE. AllocationTagsManager should memorize a node2containers mapping to avoid add/remove a container more than once, in order to keep data consistent.
> 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
>
>
> 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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