mirror of
https://github.com/ceph/ceph
synced 2024-12-22 11:31:55 +00:00
92 lines
2.9 KiB
ReStructuredText
92 lines
2.9 KiB
ReStructuredText
##############
|
|
ON-DISK FORMAT
|
|
##############
|
|
|
|
|
|
************
|
|
UPGRADE PATH
|
|
************
|
|
|
|
On-disk formats, or even data structure formats, may be changed during an
|
|
upgrade. Services wishing to do so, may so do it via the
|
|
`PaxosService::upgrade_format()` call path. There is no formalized, unified
|
|
format versioning; the `PaxosService` class keeps track of its
|
|
`format_version` through a key in the store, assumed an `unsigned int`, but
|
|
it will be the service's responsibility to give meaning to those versions.
|
|
|
|
AUTH MONITOR
|
|
============
|
|
|
|
versions
|
|
--------
|
|
|
|
versions are represented with a single `unsigned int`. By default, the value
|
|
zero represents the absence of a formal upgraded format. The first format
|
|
version was introduced in Dumpling; clusters upgrading to Dumpling saw their
|
|
format version being increased from zero to one.::
|
|
|
|
0 to 1 - introduced in v0.65, dev release for v0.67 dumpling
|
|
1 to 2 - introduced in v12.0.2, dev release for luminous
|
|
2 to 3 - introduced in mimic
|
|
|
|
0 - all clusters pre-dumpling
|
|
1 - all clusters dumpling+ and pre-luminous
|
|
2 - all clusters luminous+ and pre-mimic
|
|
3 - all clusters mimic+
|
|
|
|
version 1: introduces new-style monitor caps (i.e., profiles)
|
|
version 2: introduces mgr caps and bootstrap-mgr key
|
|
version 3: creates all bootstrap and admin keys if they don't yet exist
|
|
|
|
callstack
|
|
---------
|
|
|
|
format_version set on `PaxosService::refresh()`:::
|
|
|
|
- initially called from Monitor::refresh_from_paxos
|
|
- initially called from Monitor::init_paxos()
|
|
- initially called from Monitor::preinit()
|
|
|
|
AuthMonitor::upgrade_format() called by `PaxosService::_active()`:::
|
|
|
|
- called from C_Committed callback, from PaxosService::propose_pending()
|
|
- called from C_Active callback, from PaxosService::_active()
|
|
- called from PaxosService::election_finished()
|
|
|
|
- on a freshly deployed cluster, upgrade_format() will be first called
|
|
*after* create_initial().
|
|
- on an existing cluster, upgrade_format() will be called after the first
|
|
election.
|
|
|
|
- upgrade_format() is irrelevant on a freshly deployed cluster, as there is
|
|
no format to upgrade at this point.
|
|
|
|
boil down
|
|
---------
|
|
|
|
* if `format_version >= current_version` then format is uptodate, return.
|
|
* if `features doesn't contain LUMINOUS` then `current_version = 1`
|
|
* else if `features doesn't contain MIMIC` then `current_version = 2`
|
|
* else `current_version = 3`
|
|
|
|
if `format_version == 0`:::
|
|
|
|
- upgrade to format version 1
|
|
- move to new-style monitor caps (i.e., profiles):
|
|
- set daemon profiles for existing entities
|
|
- set profile for existing bootstrap keys
|
|
|
|
if `format_version == 1`:::
|
|
|
|
- upgrade to format version 2
|
|
- for existing entities:
|
|
- add new cap for mgr
|
|
- for existing 'mgr' entities, fix 'mon' caps due to bug from kraken
|
|
setting 'allow \*', and set 'allow profile mgr' instead.
|
|
- add bootstrap-mgr key.
|
|
|
|
if `format_version == 2`:::
|
|
|
|
- upgrade to format version 3
|
|
- create all bootstrap keys if they don't currently exist
|