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Posted to yarn-issues@hadoop.apache.org by "Peng Zhang (JIRA)" <ji...@apache.org> on 2015/03/27 08:05:53 UTC
[jira] [Updated] (YARN-3405) FairScheduler's preemption cannot
happen between sibling in some case
[ 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-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-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-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.
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