[
https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Peng Zhang updated YARN-3405:
-----------------------------
Description:
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1 queue-2
/ \
queue-1-1 queue-1-2
{noformat}
1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
was:
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1 queue-2
/ \
queue-1-1 queue-1-2
{noformat}
1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
> FairScheduler's preemption cannot happen between sibling in some case
> ---------------------------------------------------------------------
>
> Key: YARN-3405
> URL: https://issues.apache.org/jira/browse/YARN-3405
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler
> Affects Versions: 2.7.0
> Reporter: Peng Zhang
> Priority: Critical
>
> Queue hierarchy described as below:
> {noformat}
> root
> / \
> queue-1 queue-2
> / \
> queue-1-1 queue-1-2
> {noformat}
> 1. When queue-1-1 is active and it has been assigned with all resources.
> 2. When queue-1-2 is active, and it cause some new preemption request.
> 3. But when do preemption, it now starts from root, and found queue-1 is not
> over fairshare, so no recursion preemption to queue-1-1.
> 4. Finally queue-1-2 will be waiting for resource release form queue-1-1
> itself.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
