LockTimeout on loading metadata

[omero-qa]

​https://www.openmicroscopy.org/qa2/qa2/qa/feedback/9257/

Comment: Trying to view acquisition metadata on basel 700 GB image.

Traceback (most recent call last):

  File "/opt/omero/OMERO.server-5.0.2-ice34-b26/lib/python/django/core/handlers/base.py", line 114, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)

  File "/opt/omero/OMERO.server-5.0.2-ice34-b26/lib/python/omeroweb/decorators.py", line 387, in wrapped
    retval = f(request, *args, **kwargs)

  File "/opt/omero/OMERO.server-5.0.2-ice34-b26/lib/python/omeroweb/decorators.py", line 434, in wrapper
    context = f(request, *args, **kwargs)

  File "/opt/omero/OMERO.server-5.0.2-ice34-b26/lib/python/omeroweb/webclient/views.py", line 920, in load_metadata_acquisition
    manager.originalMetadata()

  File "/opt/omero/OMERO.server-5.0.2-ice34-b26/lib/python/omeroweb/webclient/controller/container.py", line 256, in originalMetadata
    om = self.image.loadOriginalMetadata()

  File "/opt/omero/OMERO.server-5.0.2-ice34-b26/lib/python/omero/gateway/__init__.py", line 6281, in loadOriginalMetadata
    cb = self._conn._waitOnCmd(handle)

  File "/opt/omero/OMERO.server-5.0.2-ice34-b26/lib/python/omero/gateway/__init__.py", line 3381, in _waitOnCmd
    return self.c.waitOnCmd(handle, loops=loops, ms=ms, failonerror=failonerror)

  File "/opt/omero/OMERO.server-5.0.2-ice34-b26/lib/python/omero/clients.py", line 827, in waitOnCmd
    callback.loop(loops, ms)  # Throw LockTimeout

  File "/opt/omero/OMERO.server-5.0.2-ice34-b26/lib/python/omero/callbacks.py", line 321, in loop
    5000L, int(waited))

LockTimeout: exception ::omero::LockTimeout
{
    serverStackTrace = None
    serverExceptionClass = None
    message = Command unfinished after 5.0 seconds
    backOff = 5000
    seconds = 5
}


<WSGIRequest
path:/webclient/metadata_acquisition/image/99501/,
GET:<QueryDict: {}>,
POST:<QueryDict: {}>,
COOKIES:{'phpbb3_a9mfv_k': '36131e27bf611582',
 'phpbb3_a9mfv_sid': '2f7b265d6111d072dfe9854fbc4deed4',
 'phpbb3_a9mfv_u': '64',
 'sessionid': 'w07nrd305pzyqfkpmde5umtican5f579',
 'style_cookie': 'null'},
META:{'CONTENT_LENGTH': '',
 'CONTENT_TYPE': '',
 'HTTP_ACCEPT': 'text/html, */*; q=0.01',
 'HTTP_ACCEPT_ENCODING': 'gzip, deflate',
 'HTTP_ACCEPT_LANGUAGE': 'en-US,en;q=0.5',
 'HTTP_CONNECTION': 'keep-alive',
 'HTTP_COOKIE': 'phpbb3_a9mfv_u=64; phpbb3_a9mfv_k=36131e27bf611582; phpbb3_a9mfv_sid=2f7b265d6111d072dfe9854fbc4deed4; style_cookie=null; sessionid=w07nrd305pzyqfkpmde5umtican5f579',
 'HTTP_HOST': 'dogfish.openmicroscopy.org',
 'HTTP_REFERER': 'http://dogfish.openmicroscopy.org/webclient/?show=image-99501',
 'HTTP_USER_AGENT': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:29.0) Gecko/20100101 Firefox/29.0',
 'HTTP_X_REQUESTED_WITH': 'XMLHttpRequest',
 'PATH_INFO': u'/webclient/metadata_acquisition/image/99501/',
 'QUERY_STRING': '',
 'REQUEST_METHOD': 'GET',
 'SCRIPT_NAME': u'',
 'SERVER_NAME': 'dogfish.openmicroscopy.org',
 'SERVER_PORT': '80',
 'SERVER_PROTOCOL': 'HTTP/1.1',
 'wsgi.errors': <flup.server.fcgi_base.TeeOutputStream object at 0x3a5dbd0>,
 'wsgi.input': <flup.server.fcgi_base.InputStream object at 0x3a5d590>,
 'wsgi.multiprocess': True,
 'wsgi.multithread': False,
 'wsgi.run_once': False,
 'wsgi.url_scheme': 'http',
 'wsgi.version': (1, 0)}>

[atarkowska]

With the experience on timeout in asynchronous requests in ​https://github.com/openmicroscopy/openmicroscopy/pull/2403 might be good idea to make timeout configurable