Feature #7770
open
"ceph osd crush set" should handle ingestion of non-compiled crush maps
Added by Brian Andrus about 10 years ago.
Updated about 5 years ago.
Component(RADOS):
CRUSH, ceph cli
Description
"ceph osd crush dump" will output a decompiled version of the crush map in a format of choice. It would be nice to be able to modify that using off-the shelf libraries of choice, and reinject it in the same format.
"ceph osd crush set" should validate, process, and ingest non-compiled versions of the crush map if a format is specified.
We probably want a better idea of what they are trying to accomplish.
Stating the obvious: If a user is going to manually modify the crush map, there is always a chance of botching it and causing the cluster to go unrecoverable. Crushtool allows the testing of maps before insertion, which offers a safeguard against accidental FUBARs.
The use-case: Some users might choose to script the modification of the crush map. While this could inherently be a bad idea, scripting the modification of a JSON or XML map would at least a lot more accessible than scripting the modification of a plain text map. If someone wants to do it, they will find a way. We could at least make it easier for them by allowing a JSON or XML insertion.
Additional ideas: perhaps an --i-know-this-is-a-bad-idea flag would accompany it. Perhaps the insertion would compile, then also perform a basic simulation or sanity check against the map to catch any horribly obvious mistakes before applying.
- Project changed from Ceph to RADOS
- Component(RADOS) CRUSH, ceph cli added
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