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https://issues.apache.org/jira/browse/YARN-5301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16003224#comment-16003224
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Daniel Templeton commented on YARN-5301:
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Interesting.
http://stackoverflow.com/questions/1532461/stringbuilder-vs-string-concatenation-in-tostring-in-java
Looks like the performance is actual identical between the two approaches
because the compiler inserts the StringBuilder under the covers. Things I did
not know.
OK. +1
> NM mount cpu cgroups failed on some systems
> -------------------------------------------
>
> Key: YARN-5301
> URL: https://issues.apache.org/jira/browse/YARN-5301
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: sandflee
> Assignee: Miklos Szegedi
> Attachments: YARN-5301.000.patch, YARN-5301.001.patch,
> YARN-5301.002.patch, YARN-5301.003.patch, YARN-5301.004.patch,
> YARN-5301.005.patch, YARN-5301.006.patch, YARN-5301.007.patch,
> YARN-5301.008.patch, YARN-5301.009.patch, YARN-5301.010.patch
>
>
> on ubuntu with linux kernel 3.19, , NM start failed if enable auto mount
> cgroup. try command:
> ./bin/container-executor --mount-cgroups yarn-hadoop cpu=/cgroup/cpu fail
> ./bin/container-executor --mount-cgroups yarn-hadoop cpu,cpuacct=/cgroup/cpu
> succ
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