Subtask #5878
Updated by Loïc Dachary over 10 years ago
The "abstract API":https://github.com/dachary/ceph/blob/wip-4929/doc/dev/osd_internals/erasure-code.rst#erasure-code-library-abstract-api is provided by dynamically loaded plugins. * core change ** add *ceph osd pool erasure-code-set <pool> <key> <value>* where *<key>* and *<value>* are arbitrary strings. ( see "MonCommands.h":https://github.com/ceph/ceph/blob/master/src/mon/MonCommands.h#L494 for an example ) * configuration ** ceph osd pool set-erasure-code set <pool> plugin-dir erasure-code-plugin-dir /var/lib/ceph/erasure-code-plugins ** ceph osd pool set-erasure-code set <pool> plugin erasure-code-plugin jerasure ** ceph osd pool set-erasure-code set <pool> m erasure-code-m 10 ** ceph osd pool set-erasure-code set <pool> k erasure-code-k 3 ** ceph osd pool set-erasure-code set <pool> algorithm erasure-code-algorithm Reed-Solomon * src/osd/ErasureCodePlugin.{h,cc} ** class ErasureCodePlugin *** erasure_coding_t *erasure_coding; *** ErasureCodePlugin(g_conf) loads the plugin using the g_conf plugin name previously set with *ceph osd pool set-erasure-code set <pool> plugin erasure-code-plugin <plugin>* , calls create_erasure_code_context(g_conf) and sets the *erasure_coding* data member with the value returned. *** ~ErasureCodePlugin() deletes the *erasure_coding* data member * unit tests ** in the test file ceph osd pool set-erasure-code set <pool> plugin-dir erasure-code-plugin-dir src/test/osd/erasure-code-plugin ** simple minded xor based erasure code plugin that only supports M=2,K=1 ** the plugin can be directed to trigger errors for tests purposes ** implement the test plugin to be the basis of a documented example to follow when implementing a new plugin