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https://issues.apache.org/jira/browse/KARAF-4073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Raffi Basmajian updated KARAF-4073:
-----------------------------------
Attachment: dump.txt
> Very high cpu caused by executing commands using shell:exec
> -----------------------------------------------------------
>
> Key: KARAF-4073
> URL: https://issues.apache.org/jira/browse/KARAF-4073
> Project: Karaf
> Issue Type: Bug
> Components: karaf-shell
> Affects Versions: 2.4.3
> Environment: Client - Windows 7 SP1
> Server - Ubuntu 15.04
> Reporter: Raffi Basmajian
> Priority: Minor
> Attachments: dump.txt
>
>
> Currently building AMQ messaging platform across multiple data centers using
> standalone AMQ brokers on Jboss Fuse 6.2/Karaf 2.4. We needed a tool for
> automating diagnostic and configuration commands across many servers with a
> single command (we're not using Fabric). So we started playing with Karaf's
> console commands. Most commands work as advertised, except for shell:exec,
> which appears to cause very high cpu consumption in certain instances; the
> issue is fairly easy to reproduce.
> On Ubuntu 15.04/Java 1.8.0_45-b14
> =============================
> 1) Install JBoss Fuse 6.2 (133)
> http://www.jboss.org/download-manager/file/jboss-fuse-6.2.0.GA-full_zip.zip
> 2) Extract, then start using bin/fuse
> 3) Start local or remote console session
> 4) Execute any of these, keep eye on cpu usage
> {quote}
> shell:exec ls
> shell:exec id
> shell:exec df -h
> {quote}
> While cpu was pegged at 99%, we observed what appeared to be high context
> switching activity in the following threads, which we assume to be threads
> for streaming command output. I've attached a stack trace showing these
> threads.
> Input Pump for Commans[ls]
> Error pump for Command[ls]
> Since we observed the issue on Jboss Fuse 6.2, which uses Karaf 2.4, I
> downloaded and started a standalone instance of Karaf 2.4.3. Using the same
> steps above, I reproduced the issue on my first attempt, so it appears this
> issue is rooted with something in Karaf, not Fuse.
> I also reproduced the issue on RHEL 7.1/Java 1.8 (same as above), on both
> Fuse/Karaf 2.4 and standalone Karaf 2.4.3.
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