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88 lines
2.5 KiB
ReStructuredText
88 lines
2.5 KiB
ReStructuredText
===========
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Compression
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===========
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.. versionadded:: Kraken
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The Ceph Object Gateway supports server-side compression of uploaded objects,
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using any of Ceph's existing compression plugins.
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Configuration
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=============
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Compression can be enabled on a storage class in the Zone's placement target
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by providing the ``--compression=<type>`` option to the command
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``radosgw-admin zone placement modify``.
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The compression ``type`` refers to the name of the compression plugin to use
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when writing new object data. Each compressed object remembers which plugin
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was used, so changing this setting does not hinder the ability to decompress
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existing objects, nor does it force existing objects to be recompressed.
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This compression setting applies to all new objects uploaded to buckets using
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this placement target. Compression can be disabled by setting the ``type`` to
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an empty string or ``none``.
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For example::
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$ radosgw-admin zone placement modify \
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--rgw-zone default \
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--placement-id default-placement \
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--storage-class STANDARD \
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--compression zlib
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{
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...
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"placement_pools": [
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{
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"key": "default-placement",
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"val": {
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"index_pool": "default.rgw.buckets.index",
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"storage_classes": {
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"STANDARD": {
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"data_pool": "default.rgw.buckets.data",
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"compression_type": "zlib"
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}
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},
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"data_extra_pool": "default.rgw.buckets.non-ec",
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"index_type": 0,
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}
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}
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],
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...
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}
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.. note:: A ``default`` zone is created for you if you have not done any
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previous `Multisite Configuration`_.
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Statistics
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==========
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While all existing commands and APIs continue to report object and bucket
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sizes based their uncompressed data, compression statistics for a given bucket
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are included in its ``bucket stats``::
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$ radosgw-admin bucket stats --bucket=<name>
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{
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...
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"usage": {
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"rgw.main": {
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"size": 1075028,
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"size_actual": 1331200,
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"size_utilized": 592035,
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"size_kb": 1050,
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"size_kb_actual": 1300,
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"size_kb_utilized": 579,
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"num_objects": 104
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}
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},
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...
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}
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The ``size_utilized`` and ``size_kb_utilized`` fields represent the total
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size of compressed data, in bytes and kilobytes respectively.
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.. _`Multisite Configuration`: ../multisite
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