diff options
| author |  Joey Hess <id@joeyh.name> | 2014-12-02 14:50:58 -0400 |
|---|---|---|
| committer | Joey Hess <id@joeyh.name> | 2014-12-02 14:50:58 -0400 |
| commit | 19ab101843af025ab69beb6f021a275671b2c460 (patch) | |
| tree | 72dee950585d3b27dc7fb929108e88ac43cf12d3 | |
| parent | 63c83896efd2560ecc5d3c74906e417e15c7c189 (diff) | |
comment
| -rw-r--r-- | doc/forum/metadata_limits/comment_1_a20bbe49f2f23d23131221ec79c8b973._comment | 28 | ||||
| -rw-r--r-- | doc/metadata.mdwn | 2 |
2 files changed, 29 insertions, 1 deletions
diff --git a/doc/forum/metadata_limits/comment_1_a20bbe49f2f23d23131221ec79c8b973._comment b/doc/forum/metadata_limits/comment_1_a20bbe49f2f23d23131221ec79c8b973._comment new file mode 100644 index 000000000..d296a1cb9 --- /dev/null +++ b/doc/forum/metadata_limits/comment_1_a20bbe49f2f23d23131221ec79c8b973._comment @@ -0,0 +1,28 @@ +[[!comment format=mdwn + username="joey" + subject="""comment 1""" + date="2014-12-02T18:39:34Z" + content=""" +There's no particular size limit for metadata. But things may not scale +well past some size. + +Having a big metadata value could make git-annex be a little slow when +dealing with metadata, since it has to parse the metadata log file. +So if you stored say, 1 mb in metadata, that's one mb of disk IO and data +processing every time git-annex looks at the metadata for that file. + +All the metadata for a file will also be buffered in memory when git-annex +is looking at that file's metadata. So `git-annex view` would use 1 mb or +so more memory in the above example. (But git-annex only looks at one +file's metadata at a time, so its memory use won't grow if you have a lot +of files with metadata.) + +Also of course, the metadata is stored in git, and so it will make your git +repository bigger. + +I would not expect any reasonable description of a photo to be large enough +for its size to be a problem. + +I'd even feel ok with putting the full text of a license in as metadata +(GPL is 30kb, and git would deduplicate redundant license metadata). +"""]] diff --git a/doc/metadata.mdwn b/doc/metadata.mdwn index fed332351..f1f0ceab7 100644 --- a/doc/metadata.mdwn +++ b/doc/metadata.mdwn @@ -21,7 +21,7 @@ applies to the file. The field names are limited to alphanumerics (and `[_-.]`), and are case insensitive. The metadata values can contain absolutely anything you -like -- but you're recommended to keep it simple and reasonably short. +like -- but you're recommended to keep it simple and [[reasonably short|forum/metadata_limits]] Here are some metadata fields that git-annex has special support for: |