~unity-2d-team/unity-2d/Shell-MultiMonitor

A little bit of server.

added added

removed removed

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU Affero General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

# GNU Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public

# License along with this program. If not, see

# <http://www.gnu.org/licenses/>.

"""Things to ease working with cassandra."""

from pycassa.pool import InvalidRequestError

def workaround_1779(callable, *args, **kwargs):

"""Workaround cassandra not being able to do concurrent schema edits.

The callable is tried until it does not raised InvalidRequestException

with why = "Previous version mismatch. cannot apply."

:param callable: The callable to call.

:param args: The args for it.

:param kwargs: The kwargs for it.

:return: The result of calling the callable.

"""

while True:

# Workaround https://issues.apache.org/jira/browse/CASSANDRA-1779:

# Cassandra cannot do concurrent schema changes.

try:

return callable(*args, **kwargs)

break

except InvalidRequestError as e:

if e.why != 'Previous version mismatch. cannot apply.':

raise