Hi Lu Niu, Yes, you could use `yarn.containers.vcores` to set the vcores of taskmanager. However, it could not guarantee that the application do not affect each other. By default, the yarn cluster are using cgroup share. That means a taskmanager could use more cpu than it allocated. When the machine is heavy, linux kernel will use cpu share as weight to control different processes.
If you want to limit the taskmanager could only use as it allocated, the `yarn.nodemanager.linux-container-executor.cgroups.strict-resource-usage=true` is the only way. Yarn nodemanager will set cpu quota for each taskmanager. Best, Yang Lu Niu <qqib...@gmail.com> 于2019年11月7日周四 上午1:15写道： > Hi, > > Thanks for replying! Basically I want to limit cpu usage so that different > application don't affect each other. What's current best practice? Looks > `yarn.nodemanager.linux-container-executor.cgroups.strict-resource-usage=true` > is one way. How to set how many cpu resources to use? is it > "yarn.containers.vcores" ? > > it should be -ys not -yn in original post, sorry for the typo. > > Best > Lu > > On Wed, Nov 6, 2019 at 1:41 AM Yang Wang <danrtsey...@gmail.com> wrote: > >> If you want to limit the TaskManager container cpu usage, it is based on >> your yarn cluster configuration. >> By default, yarn only uses cpu share. You need to set >> `yarn.nodemanager.linux-container-executor.cgroups.strict-resource-usage=true` >> in yarn-site.xml of all yarn node managers. >> >> >> Best, >> Yang >> >> Victor Wong <jiasheng.w...@outlook.com> 于2019年11月6日周三 下午5:02写道： >> >>> Hi Lu, >>> >>> >>> >>> You can check out which operator thread causes the high CPU usage, and >>> set a unique slot sharing group name [1] to it to prevent too many operator >>> threads running in the same TM. >>> >>> Hope this will be helpful😊 >>> >>> >>> >>> [1]. >>> https://ci.apache.org/projects/flink/flink-docs-stable/dev/stream/operators/#task-chaining-and-resource-groups >>> >>> >>> >>> Best, >>> >>> Victor >>> >>> >>> >>> *From: *Vino Yang <yanghua1...@gmail.com> >>> *Date: *Wednesday, 6 November 2019 at 4:26 PM >>> *To: *Lu Niu <qqib...@gmail.com> >>> *Cc: *user <user@flink.apache.org> >>> *Subject: *Re: Limit max cpu usage per TaskManager >>> >>> >>> >>> Hi Lu, >>> >>> >>> >>> When using Flink on YARN, it will rely on YARN's resource management >>> capabilities, and Flink cannot currently limit CPU usage. >>> >>> Also, what version of Flink do you use? As far as I know, since Flink >>> 1.8, the -yn parameter will not work. >>> >>> >>> >>> Best, >>> >>> Vino >>> >>> >>> >>> Lu Niu <qqib...@gmail.com> 于2019年11月6日周三 下午1:29写道： >>> >>> Hi, >>> >>> >>> >>> When run flink application in yarn mode, is there a way to limit maximum >>> cpu usage per TaskManager? >>> >>> >>> >>> I tried this application with just source and sink operator. >>> parallelism of source is 60 and parallelism of sink is 1. When running in >>> default config, there are 60 TaskManager assigned. I notice one TaskManager >>> process cpu usage could be 200% white the rest below 50%. >>> >>> >>> >>> When I set -yn = 2 (default is 1), I notice # of TaskManger dropped down >>> to 30. and one TaskManger process cpu usage could be 600% while the rest >>> below 50%. >>> >>> >>> >>> Tried to set yarn.containers.vcores = 2, all tasks are in start state >>> forever, application is not able to turn to running state. >>> >>> >>> >>> Best >>> >>> Lu >>> >>>
