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# Copyright (c) 2011 Canonical Ltd
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public
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# License along with this program. If not, see
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# <http://www.gnu.org/licenses/>.
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"""Things to ease working with cassandra."""
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from pycassa.pool import InvalidRequestError
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def workaround_1779(callable, *args, **kwargs):
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"""Workaround cassandra not being able to do concurrent schema edits.
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The callable is tried until it does not raised InvalidRequestException
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with why = "Previous version mismatch. cannot apply."
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:param callable: The callable to call.
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:param args: The args for it.
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:param kwargs: The kwargs for it.
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:return: The result of calling the callable.
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# Workaround https://issues.apache.org/jira/browse/CASSANDRA-1779:
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# Cassandra cannot do concurrent schema changes.
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return callable(*args, **kwargs)
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except InvalidRequestError as e:
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if e.why != 'Previous version mismatch. cannot apply.':
added
removed
grackle/cassandra.py
