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Andreas Raster updated MESOS-1845: ---------------------------------- Summary: CommandInfo tasks may fail when scheduled after another task with the same id has finished. (was: CommandInfo tasks may fail if scheduled after another task with the same id has finished.) > 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 > > 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 -- This message was sent by Atlassian JIRA (v6.3.4#6332)