Miklos Szegedi created HADOOP-15372:
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Summary: Race conditions and possible leaks in the Shell class
Key: HADOOP-15372
URL: https://issues.apache.org/jira/browse/HADOOP-15372
Project: Hadoop Common
Issue Type: Bug
Affects Versions: 2.10.0, 3.2.0
Reporter: Miklos Szegedi
YARN-5641 introduced some cleanup code in the Shell class. It has a race
condition. {{Shell.
runCommand()}} can be called while/after {{Shell.getAllShells()}} returned all
the shells to be cleaned up. This new thread can avoid the clean up, so that
the process held by it can be leaked causing leaked localized files/etc.
I also see an unrelated issue as well. {{Shell.runCommand()}} has a finally
block with a {{
process.destroy();}} to clean up. However, the try catch block does not cover
all instructions after the process is started, so for example we can exit the
thread and leak the process, if {{
timeOutTimer.schedule(timeoutTimerTask, timeOutInterval);}} causes an exception.
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