mirror of
https://github.com/ceph/ceph
synced 2024-12-26 21:43:10 +00:00
80 lines
2.3 KiB
ReStructuredText
80 lines
2.3 KiB
ReStructuredText
===========
|
|
Compression
|
|
===========
|
|
|
|
.. versionadded:: Kraken
|
|
|
|
The Ceph Object Gateway supports server-side compression of uploaded objects,
|
|
using any of Ceph's existing compression plugins.
|
|
|
|
|
|
Configuration
|
|
=============
|
|
|
|
Compression can be enabled on a Zone's placement target by providing the
|
|
``--compression=<type>`` option to the ``radosgw-admin zone placement modify``
|
|
command.
|
|
|
|
The compression ``type`` refers to the name of the compression plugin to use
|
|
when writing new object data. Each compressed object remembers which plugin
|
|
was used, so changing this setting does not hinder the ability to decompress
|
|
existing objects, not does it force existing objects to be recompressed.
|
|
|
|
This compression setting applies to all new objects uploaded to buckets using
|
|
this placement target. Compression can be disabled by setting the ``type`` to
|
|
an empty string or ``none``.
|
|
|
|
For example::
|
|
|
|
$ radosgw-admin zone placement modify --rgw-zone=default --placement-id=default-placement --compression=zlib
|
|
{
|
|
...
|
|
"placement_pools": [
|
|
{
|
|
"key": "default-placement",
|
|
"val": {
|
|
"index_pool": "default.rgw.buckets.index",
|
|
"data_pool": "default.rgw.buckets.data",
|
|
"data_extra_pool": "default.rgw.buckets.non-ec",
|
|
"index_type": 0,
|
|
"compression": "zlib"
|
|
}
|
|
}
|
|
],
|
|
...
|
|
}
|
|
|
|
.. note:: A ``default`` zone is created for you if you have not done any
|
|
previous `Multisite Configuration`_.
|
|
|
|
|
|
Statistics
|
|
==========
|
|
|
|
While all existing commands and APIs continue to report object and bucket
|
|
sizes based their uncompressed data, compression statistics for a given bucket
|
|
are included in its ``bucket stats``::
|
|
|
|
$ radosgw-admin bucket stats --bucket=<name>
|
|
{
|
|
...
|
|
"usage": {
|
|
"rgw.main": {
|
|
"size": 1075028,
|
|
"size_actual": 1331200,
|
|
"size_utilized": 592035,
|
|
"size_kb": 1050,
|
|
"size_kb_actual": 1300,
|
|
"size_kb_utilized": 579,
|
|
"num_objects": 104
|
|
}
|
|
},
|
|
...
|
|
}
|
|
|
|
The ``size_utilized`` and ``size_kb_utilized`` fields represent the total
|
|
size of compressed data, in bytes and kilobytes respectively.
|
|
|
|
|
|
.. _`Multisite Configuration`: ../multisite
|