Fedora 19 Update: python-larch-1.20131130-1.fc19

[updates at fedoraproject.org]

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Fedora Update Notification
FEDORA-2014-15982
2014-12-01 18:05:55
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Name        : python-larch
Product     : Fedora 19
Version     : 1.20131130
Release     : 1.fc19
URL         : http://liw.fi/larch/
Summary     : Python B-tree library
Description :
This is an implementation of particular kind of B-tree, based on
research by Ohad Rodeh. See "B-trees, Shadowing, and Clones" (copied
here with permission of author) for details on the data
structure. This is the same data structure that btrfs uses. Note that
my implementation is independent from the btrfs one, and might differ
from what the paper describes.

The distinctive feature of this B-tree is that a node is never
modified (sort-of). Instead, all updates are done by
copy-on-write. Among other things, this makes it easy to clone a tree,
and modify only the clone, while other processes access the original
tree. This is utterly wonderful for my backup application, and that's
the reason I wrote larch in the first place.

I have tried to keep the implementation generic and flexible, so that
you may use it in a variety of situations. For example, the tree
itself does not decide where its nodes are stored: you provide a class
that does that for it. I have two implementations of the NodeStore
class, one for in-memory and one for on-disk storage.

The tree attempts to guarantee this: all modifications you make will
be safely stored in the node store when the larch.Forest.commit method
is called. After that, unless you actually modify the committed tree
yourself, it will be safe from further modifications. (You need to
take care to create a new tree for further modifications, though.)

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Update Information:

* Serious bug fixed: the "KeyError" crash for reference counts. This
  was false memory use optimisation, which triggered a rare bug in
  related code. Repeatable test case by Rob Kendrick, and helpful
  analysis by Itamar Turing-Trauring.

* Serious bug fixed: another "node missing" bug. This crash was
  caused by a bug that overwrote on-disk reference count groups
  with zeroes. Repeatable test case by Rob Kendrick.

* Fixes to fsck from Antoine Brenner.

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ChangeLog:

* Thu Nov 27 2014 Michel Alexandre Salim <salimma at fedoraproject.org> - 1.20131130-1
- Update to 1.20131130
* Fri Sep 27 2013 Michel Salim <salimma at fedoraproject.org> - 1.20130808-1
- Update to 1.20130808
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References:

  [ 1 ] Bug #1036606 - python-larch-1.20131130 is available
        https://bugzilla.redhat.com/show_bug.cgi?id=1036606
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This update can be installed with the "yum" update program.  Use
su -c 'yum update python-larch' at the command line.
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available at http://docs.fedoraproject.org/yum/.

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