Create crush library¶

Summary¶

CRUSH is relatively self-contained, but is statically linked into Ceph and difficult to use externally. Several people have expressed interest in building CRUSH has a standalone shared library for easier consumption.

Owners¶

• Name (Affiliation)

Interested Parties¶

• Sage Weil
• Danny Al-Gaaf
• Josh Durgin
• Loic Dachary
• Christophe Courtaut christophe.courtaut@gmail.com
• Xiaobing Zhou(xzhou40 (AT) hawk.iit.edu)

Current Status¶

Linked statically. Mostly self-contained.
Mix of C and C++ code and implementation: core mapping functionality is C, but map manipulation is C++ only.
Standalone 'crushtool' binary for manipulating maps.

Detailed Description.¶

There are two general categories of code: the mapping code, which is all in C and shared with the Linux kernel, and the map manipulation, which is all C++ and userland only. A shared library means building a single API for both, or possibly separating into two libraries (one for mapping and one more map manipulation). Lots of interface cleanup. and some build changes.

Work items¶

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Callstack:
    at Planning/Sideboard/create_crush_library