https://bugzilla.redhat.com/show_bug.cgi?id=827808
Bug ID: 827808
QA Contact: extras...@fedoraproject.org
Severity: medium
Version: rawhide
Priority: medium
CC: nott...@redhat.com,
package-review@lists.fedoraproject.org
Assignee: nob...@fedoraproject.org
Summary: Review Request: python-larch - Python B-tree library
Regression: ---
Story Points: ---
Classification: Fedora
OS: Linux
Reporter: michel+...@sylvestre.me
Type: ---
Documentation: ---
Hardware: All
Mount Type: ---
Status: NEW
Component: Package Review
Product: Fedora
Spec URL: http://salimma.fedorapeople.org/specs/admin/python-larch.spec
SRPM URL:
http://salimma.fedorapeople.org/specs/admin/python-larch-1.20120527-1.fc17.src.rpm
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.)
Fedora Account System Username: salimma
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