磁盘格式

升级路径

在升级过程中，磁盘格式甚至数据结构格式都可能被更改。希望这样做，可以通过 PaxosService::upgrade_format() 调用路径来完成。没有正式的、统一的格式版本控制；PaxosService 类通过存储中的一个键来跟踪其 format_version，假设是一个 unsigned int ，但它将是服务负责为这些版本赋予意义。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.

认证监控

versions

版本用一个 unsigned int 表示。默认情况下，零值表示没有正式升级的格式。第一个格式版本是在 Dumpling 中引入的；升级到 Dumpling 的集群看到它们的格式版本从零增加到一：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:

to 1 - introduced in v0.65, dev release for v0.67 dumpling
to 2 - introduced in v12.0.2, dev release for luminous
to 3 - introduced in mimic

- all clusters pre-dumpling
- all clusters dumpling+ and pre-luminous
- all clusters luminous+ and pre-mimic
- 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

调用栈

在 PaxosService::refresh() 上设置的 format_versionAuthMonitor::upgrade_format() 由 PaxosService::_active() 调用:

- initially called from Monitor::refresh_from_paxos
  - initially called from Monitor::init_paxos()
    - initially called from Monitor::preinit()

概括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.

如果

如果format_version >= current_version则格式是最新的，返回。
如果features 不包含 LUMINOUS然后current_version = 1
否则如果features 不包含 MIMIC然后current_version = 2
否则current_version = 3

如果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

如果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.

如果format_version == 2:

- upgrade to format version 3
  - create all bootstrap keys if they don't currently exist

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