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https://issues.apache.org/jira/browse/YARN-10198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17063433#comment-17063433
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Peter Bacsko commented on YARN-10198:
-------------------------------------
[~maniraj...@gmail.com] I was thinking about adding a comment about null-check.
In short: it's not necessary, because instanceof simply returns false if the
object is null.
> [managedParent].%primary_group mapping rule doesn't work after YARN-9868
> ------------------------------------------------------------------------
>
> Key: YARN-10198
> URL: https://issues.apache.org/jira/browse/YARN-10198
> Project: Hadoop YARN
> Issue Type: Bug
> Components: capacity scheduler
> Reporter: Peter Bacsko
> Assignee: Peter Bacsko
> Priority: Major
> Attachments: YARN-10198-001.patch, YARN-10198-002.patch,
> YARN-10198-003.patch
>
>
> YARN-9868 introduced an unnecessary check if we have the following placement
> rule:
> [managedParentQueue].%primary_group
> Here, {{%primary_group}} is expected to be created if it doesn't exist.
> However, there is this validation code which is not necessary:
> {noformat}
> } else if (mapping.getQueue().equals(PRIMARY_GROUP_MAPPING)) {
> if (this.queueManager
> .getQueue(groups.getGroups(user).get(0)) != null) {
> return getPlacementContext(mapping,
> groups.getGroups(user).get(0));
> } else {
> return null;
> }
> {noformat}
> We should revert this part to the original version:
> {noformat}
> } else if (mapping.queue.equals(PRIMARY_GROUP_MAPPING)) {
> return getPlacementContext(mapping,
> groups.getGroups(user).get(0));
> }
> {noformat}
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