[ 
https://issues.apache.org/jira/browse/YARN-3416?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

mai shurong updated YARN-3416:
------------------------------
    Description: 
I submit a  big job, which has 500 maps and 350 reduce, to a 
queue(fairscheduler) with 300 max cores. When the big mapreduce job is running 
100% maps, the 300 reduces have occupied 300 max cores in the queue. And then, 
a map fails and retry, waiting for a core, while the 300 reduces are waiting 
for failed map to finish. So a deadlock occur. As a result, the job is blocked, 
and the later job in the queue cannot run because no available cores in the 
queue.
I think there is the similar issue for memory of a queue .


  was:
I submit a  big job, which has 500 maps and 350 reduce, to a 
queue(fairscheduler) with 300 max cores. When the big mapreduce job is running 
100% maps, the 300 reduces have occupied 300 max cores in the queue. And then, 
a map fails and retry, waiting for a core, while the 300 reduces are waiting 
for failed map to finish. So a deadlock occur. As a result, the job is blocked, 
and the later job in the queue cannot run because no available cores in the 
queue.



> deadlock in a job between map and reduce cores allocation 
> ----------------------------------------------------------
>
>                 Key: YARN-3416
>                 URL: https://issues.apache.org/jira/browse/YARN-3416
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.6.0
>            Reporter: mai shurong
>
> I submit a  big job, which has 500 maps and 350 reduce, to a 
> queue(fairscheduler) with 300 max cores. When the big mapreduce job is 
> running 100% maps, the 300 reduces have occupied 300 max cores in the queue. 
> And then, a map fails and retry, waiting for a core, while the 300 reduces 
> are waiting for failed map to finish. So a deadlock occur. As a result, the 
> job is blocked, and the later job in the queue cannot run because no 
> available cores in the queue.
> I think there is the similar issue for memory of a queue .



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Reply via email to