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The remaining work is to write additional tests. src/allmydata/test/no_network.py: This supports tests in which servers leave the grid only to return with their shares intact at a later time. src/allmydata/test/test_mutable.py: The UCWEs in the incident reports associated with #1628 all seem to be associated with shares that the servermap knows about, but which aren't accounted for during the publish process for whatever reason. Specifically, it looks like the publisher is only capable of keeping track of a single storage server for a given share. This makes the repair process worse than it was pre-MDMF at updating all of the shares of a particular file to the newest version, and can also cause spurious UCWEs. This test simulates such a layout and fails if an UCWE is thrown. We need to write another test to ensure that all copies of a share are updated to the latest version (or alter this test to do that), so that the test suite doesn't pass unless both regressions are fixed. We want the publisher to follow the existing share placement when uploading a new version of a mutable file, and we don't want this test to pass unless it does. src/allmydata/mutable/publish.py: Before this commit, the publisher only kept track of a single writer for each share. This is insufficient to handle updates in which a single share may live on multiple servers. In the best case, an update will only update one of the existing shares instead of all of them. In some cases, the update will encounter the existing shares when publishing some other share, interpret it as a sign of an uncoordinated update, and fail. Keeping track of all of the writers helps ensure that all existing shares are updated, and helps avoid spurious uncoordinated write errors.
========== Tahoe-LAFS ========== Tahoe-LAFS is a Free Software/Open Source decentralized data store. It distributes your filesystem across multiple servers, and even if some of the servers fail or are taken over by an attacker, the entire filesystem continues to work correctly and to preserve your privacy and security. To get started please see `quickstart.rst`_ in the docs directory. LICENCE ======= You may use this package under the GNU General Public License, version 2 or, at your option, any later version. You may use this package under the Transitive Grace Period Public Licence, version 1.0, or at your option, any later version. (You may choose to use this package under the terms of either licence, at your option.) See the file `COPYING.GPL`_ for the terms of the GNU General Public License, version 2. See the file `COPYING.TGPPL.rst`_ for the terms of the Transitive Grace Period Public Licence, version 1.0. See `TGPPL.PDF`_ for why the TGPPL exists, graphically illustrated on three slides. .. _quickstart.rst: https://tahoe-lafs.org/source/tahoe-lafs/trunk/docs/quickstart.rst .. _COPYING.GPL: https://tahoe-lafs.org/trac/tahoe-lafs/browser/COPYING.GPL .. _COPYING.TGPPL.rst: https://tahoe-lafs.org/trac/tahoe-lafs/browser/COPYING.TGPPL.rst .. _TGPPL.PDF: https://tahoe-lafs.org/~zooko/tgppl.pdf