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Diffstat (limited to 'doc/internals.mdwn')
| -rw-r--r-- | doc/internals.mdwn | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/doc/internals.mdwn b/doc/internals.mdwn index 1cf0cf505..970e88ba0 100644 --- a/doc/internals.mdwn +++ b/doc/internals.mdwn @@ -146,6 +146,27 @@ Example: 1287290776.765152s e605dca6-446a-11e0-8b2a-002170d25c55 blah blah 1287290767.478634s 26339d22-446b-11e0-9101-002170d25c55 foo=bar +## `aaa/bbb/*.log.met` + +These log files are used to store arbitrary [[design/metadata]] about keys. +Each key can have any number of metadata fields. Each field has a set of +values. + +Lines are timestamped, and record when values are added (`field +value`), +but also when values are removed (`field -value`). Removed values +are retained in the log so that when merging an old line that sets a value +that was later unset, the value is not accidentially added back. + +For example: + + 1287290776.765152s tag +foo +bar author +joey + 1291237510.141453s tag -bar +baz + +The value can be completely arbitrary data, although it's typically +reasonably short. If the value contains any whitespace +(including \r or \r), it will be base64 encoded. Base64 encoded values +are indicated by prefixing them with "!" + ## `schedule.log` Used to record scheduled events, such as periodic fscks. |