Peter Bacsko created YARN-10019:
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Summary: container-executor: misc improvements in child process
and regarding exec() calls
Key: YARN-10019
URL: https://issues.apache.org/jira/browse/YARN-10019
Project: Hadoop YARN
Issue Type: Bug
Components: nodemanager
Reporter: Peter Bacsko
Assignee: Peter Bacsko
There are a couple of improvements that we can do in container-executor
regarding how we exit from child processes and how we handle failed exec()
calls:
1. If we're in the child code path and we detect an erroneous condition, the
usual way is just simply call {{_exit()}}. Normal {{exit()}} occurs in the
parent. Calling {{_exit()}} prevents flushing stdio buffers twice and any
cleanup logic registered with {{atexit()}} or {{on_exit()}} will run only once.
2. There's code like {{if (execlp(script_file_dest, script_file_dest, NULL) !=
0) ...}} which is not necessary. Exec functions are not supposed to return. If
they do, it's definitely an error, so no need to check the return value.
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