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https://issues.apache.org/jira/browse/MESOS-1845?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Klaus Ma reassigned MESOS-1845:
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Assignee: Klaus Ma
> CommandInfo tasks may fail when scheduled after another task with the same id
> has finished.
> -------------------------------------------------------------------------------------------
>
> Key: MESOS-1845
> URL: https://issues.apache.org/jira/browse/MESOS-1845
> Project: Mesos
> Issue Type: Bug
> Reporter: Andreas Raster
> Assignee: Klaus Ma
>
> I created a little test framework where I wanted to experiment with
> scheduling tasks where running one task relies on the results of another,
> previously run task. So in my test framework I would first schedule a task
> that would append the string "foo" to a file, and after that one finishes I
> would schedule a task that appends "bar" to the same file.
> This worked well when using ExecutorInfo, but when I switched to using
> CommandInfo instead (specifying commands like 'echo foo >> /share/foobar.txt'
> in set_value()), it would most of the time fail in the second step when
> attempting to append "bar". Occasionally, but very rarely, it would work
> though.
> I couldn't find any meaningful log messages indicating what exactly went
> wrong. The slave log would indicate that the tasks status changed to
> TASK_FAILED and that that status update was sent correctly. The stdout log in
> the Sandbox would indicate that the command 'exited with status 0'.
> I could work around the issue when I specified task ids that were always
> unique. Previously I would reuse the id of a previously run task, one that
> appended "foo" to a file, after it finished in the followup task that would
> append "bar" to a file.
> It seems to me there might be something wrong when scheduling very short
> running tasks with the same id quickly after each other.
> Source code for my foobar framework:
> http://paste.ubuntu.com/8459083
> Build with:
> g++ -std=c++0x -g -Wall foobar_framework.cpp -I. -L/usr/local/lib -lmesos -o
> foobar-framework
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