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From "Sunil G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4479) Retrospect app-priority in pendingOrderingPolicy during recovering applications
Date Wed, 20 Jan 2016 09:49:39 GMT

    [ https://issues.apache.org/jira/browse/YARN-4479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15108300#comment-15108300
] 

Sunil G commented on YARN-4479:
-------------------------------

Thanks [~leftnoteasy] for the detailed comment.
Yes, I understood the reason behind the same when FairOrderingPolicy is used. Generally fine
with approach suggested. However few minor points.

1.
bq.Keep changes for SchedulerApplicationAttempt/CapacityScheduler in the patch: 0006-YARN-4479.patch
to set "isRecoverying" field
We already have a recovering field in SchedulerApplicationAttempt. But if we make use of this,
we need to reset the flag once application is moved to {{activeApplications}} list. So if
we reset this flag, we will loose information whether this was a recovered app. As of now
I am not seeing any use with this, but it may confuse. So cud we introduce a new flag/field
for this to avoid confusion.

2. With new FifoOrderingPolicyForPendingApps, we are agreeing that Priority and Submission
Time will be factor to decide pending apps ordering, correct?


> Retrospect app-priority in pendingOrderingPolicy during recovering applications
> -------------------------------------------------------------------------------
>
>                 Key: YARN-4479
>                 URL: https://issues.apache.org/jira/browse/YARN-4479
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: api, resourcemanager
>            Reporter: Rohith Sharma K S
>            Assignee: Rohith Sharma K S
>             Fix For: 2.8.0
>
>         Attachments: 0001-YARN-4479.patch, 0002-YARN-4479.patch, 0003-YARN-4479.patch,
0004-YARN-4479.patch, 0004-YARN-4479.patch, 0005-YARN-4479.patch, 0006-YARN-4479.patch
>
>
> Currently, same ordering policy is used for pending applications and active applications.
When priority is configured for an applications, during recovery high priority application
get activated first. It is possible that low priority job was submitted and running state.

> This causes low priority job in starvation after recovery



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