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Posted to yarn-issues@hadoop.apache.org by "Babble Shack (JIRA)" <ji...@apache.org> on 2019/08/11 15:53:00 UTC
[jira] [Created] (YARN-9737) Performance degradation, distributed
opportunistic scheduling
Babble Shack created YARN-9737:
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Summary: Performance degradation, distributed opportunistic scheduling
Key: YARN-9737
URL: https://issues.apache.org/jira/browse/YARN-9737
Project: Hadoop YARN
Issue Type: Bug
Components: distributed-scheduling, yarn
Affects Versions: 3.1.2
Environment: OS: Ubuntu 18.04
JVM: 1.8.0_212-8u212-b03-0ubuntu1.18.04.1-b03
1 * Resource Manager – Intel Core i7-4770 CPU @ 3.40GHz, 16GB Memory, 256GB ssd.
37 * Node Managers - Intel Core i7-4770 CPU @ 3.40GHz, 8GB Memory, 256GB ssd.
2 * 3.5 Gb slots per Node Manager.
yarn-site: [^yarn-site.xml]
yarn-client-yarn-site: [^yarn-client.yarn-site.xml]
Reporter: Babble Shack
Attachments: jct_cdf_100j_100t_1500.svg, jct_cdf_100j_50t_1500_with_outliers.svg, jet_boxplot_j100_50t_1500.svg, jet_boxplot_j100_50t_1500_with_outliers.svg, task_throughput_boxplot_100j_50t_1500.svg, yarn-client.yarn-site.xml, yarn-site.xml
Opportunistic scheduling is supposed to provide lower scheduling time, and thus higher task throughput and lower job completion times for short jobs/tasks.
Through my experiments I have found distributed scheduling can degrade performance.
I ran a gridmix trace of 100 short jobs, each with 50 tasks, with an average run time of 1523ms.
Findings:
* Job completion time, the time take from submitting a job to job completion, may degrade by over 200%
[^jct_cdf_100j_100t_1500.svg]
[^jct_cdf_100j_50t_1500_with_outliers.svg]
* Job execution time may increase by up to 300%
[^jet_boxplot_j100_50t_1500.svg]
[^jet_boxplot_j100_50t_1500_with_outliers.svg]
* Task throughput decreased by 50%
^[^task_throughput_boxplot_100j_50t_1500.svg]^
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