pysparkling: h2o on exit does not shut down cleanly

[exalate-issue-sync]

When we shutdown h2o as part of a pysparkling shell exit, all kinds of exceptions are logged to the console which can potentially cause the application to unnecessarily warn the user even though the application successfully completed.
{code:java}

exit()
H2O session _sid_833c closed.
/home/H2O/sparkling-water-2.1.16/py/build/dist/h2o_pysparkling_2.1-2.1.16.zip/pysparkling/context.py:151: UserWarning: Stopping H2OContext. (Restarting H2O is not yet fully supported...)
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
File "/opt/pythonz/pythons/CPython-2.7.5/lib/python2.7/atexit.py", line 24, in _run_exitfuncs
func(*targs, **kargs)
File "/home/H2O/sparkling-water-2.1.16/py/build/dist/h2o_pysparkling_2.1-2.1.16.zip/pysparkling/context.py", line 140, in
atexit.register(lambda: h2o_context.stop_with_jvm())
File "/home/H2O/sparkling-water-2.1.16/py/build/dist/h2o_pysparkling_2.1-2.1.16.zip/pysparkling/context.py", line 147, in stop_with_jvm
self.stop()
File "/home/H2O/sparkling-water-2.1.16/py/build/dist/h2o_pysparkling_2.1-2.1.16.zip/pysparkling/context.py", line 152, in stop
Initializer.clean_temp_dir()
File "/home/H2O/sparkling-water-2.1.16/py/build/dist/h2o_pysparkling_2.1-2.1.16.zip/pysparkling/initializer.py", line 81, in clean_temp_dir
shutil.rmtree(Initializer.__extracted_jar_dir)
File "/opt/pythonz/pythons/CPython-2.7.5/lib/python2.7/shutil.py", line 239, in rmtree
onerror(os.listdir, path, sys.exc_info())
File "/opt/pythonz/pythons/CPython-2.7.5/lib/python2.7/shutil.py", line 237, in rmtree
names = os.listdir(path)
OSError: [Errno 2] No such file or directory: '/tmp/tmpWCvXCm'
Error in sys.exitfunc:
{code}

[exalate-issue-sync]

Nidhi Mehta commented: [~accountid:557058:eeeb611c-665e-431d-b442-1f255171db6f] Michal thinks it got introduced here - dae9f3a [SW-539] - new functionality registered on shutdown, but it expects to have enough time to make potentionally expensive cleanup

[DinukaH2O]

JIRA Issue Migration Info

Jira Issue: SW-569
Assignee: Jakub Hava
Reporter: Nidhi Mehta
State: Resolved
Fix Version: 2.0.18
Attachments: N/A
Development PRs: Available

Linked PRs from JIRA

#427

[hasithjp]

JIRA Issue Migration Info Cont'd

Jira Issue Created Date: 2017-10-23T14:46:29.959-0700