ChenFolin created YARN-5188:
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Summary: FairScheduler performance bug
Key: YARN-5188
URL: https://issues.apache.org/jira/browse/YARN-5188
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.5.0, 2.8.0
Reporter: ChenFolin
My Hadoop Cluster has recently encountered a performance problem. Details as
Follows.
The efficiency of assign container in the Resourcemanager may fall when
the number of running and pending application grows. And the fact is the
cluster has too many PendingMB or PengdingVcore , and the Cluster
current utilization rate may below 20%.
I checked the resourcemanager logs, I found that every assign container
may cost 5 ~ 10 ms, but just 0 ~ 1 ms at usual time.
I use TestFairScheduler to reproduce the scene:
Just one queue: root.defalut
10240 apps.
assign container avg time: 6753.9 us ( 6.7539 ms)
apps sort time (FSLeafQueue : Collections.sort(runnableApps, comparator);
): 4657.01 us ( 4.657 ms )
compute LeafQueue Resource usage : 905.171 us ( 0.905171 ms )
When just root.default, one assign container op contains : ( one apps sort
op ) + 2 * ( compute leafqueue usage op )
According to the above situation, I think the assign container op has a
performance problem .
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