mirror of https://github.com/ceph/ceph
182 lines
5.2 KiB
ReStructuredText
182 lines
5.2 KiB
ReStructuredText
=========================
|
|
ElasticSearch Sync Module
|
|
=========================
|
|
|
|
.. versionadded:: Kraken
|
|
|
|
This sync module writes the metadata from other zones to `ElasticSearch`_. As of
|
|
luminous this is a json of data fields we currently store in ElasticSearch.
|
|
|
|
::
|
|
|
|
{
|
|
"_index" : "rgw-gold-ee5863d6",
|
|
"_type" : "object",
|
|
"_id" : "34137443-8592-48d9-8ca7-160255d52ade.34137.1:object1:null",
|
|
"_score" : 1.0,
|
|
"_source" : {
|
|
"bucket" : "testbucket123",
|
|
"name" : "object1",
|
|
"instance" : "null",
|
|
"versioned_epoch" : 0,
|
|
"owner" : {
|
|
"id" : "user1",
|
|
"display_name" : "user1"
|
|
},
|
|
"permissions" : [
|
|
"user1"
|
|
],
|
|
"meta" : {
|
|
"size" : 712354,
|
|
"mtime" : "2017-05-04T12:54:16.462Z",
|
|
"etag" : "7ac66c0f148de9519b8bd264312c4d64"
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
ElasticSearch tier type configurables
|
|
-------------------------------------
|
|
|
|
* ``endpoint``
|
|
|
|
Specifies the Elasticsearch server endpoint to access
|
|
|
|
* ``num_shards`` (integer)
|
|
|
|
The number of shards that Elasticsearch will be configured with on
|
|
data sync initialization. Note that this cannot be changed after init.
|
|
Any change here requires rebuild of the Elasticsearch index and reinit
|
|
of the data sync process.
|
|
|
|
* ``num_replicas`` (integer)
|
|
|
|
The number of the replicas that Elasticsearch will be configured with
|
|
on data sync initialization.
|
|
|
|
* ``explicit_custom_meta`` (true | false)
|
|
|
|
Specifies whether all user custom metadata will be indexed, or whether
|
|
user will need to configure (at the bucket level) what custom
|
|
metadata entries should be indexed. This is false by default
|
|
|
|
* ``index_buckets_list`` (comma separated list of strings)
|
|
|
|
If empty, all buckets will be indexed. Otherwise, only buckets
|
|
specified here will be indexed. It is possible to provide bucket
|
|
prefixes (e.g., foo\*), or bucket suffixes (e.g., \*bar).
|
|
|
|
* ``approved_owners_list`` (comma separated list of strings)
|
|
|
|
If empty, buckets of all owners will be indexed (subject to other
|
|
restrictions), otherwise, only buckets owned by specified owners will
|
|
be indexed. Suffixes and prefixes can also be provided.
|
|
|
|
* ``override_index_path`` (string)
|
|
|
|
if not empty, this string will be used as the elasticsearch index
|
|
path. Otherwise the index path will be determined and generated on
|
|
sync initialization.
|
|
|
|
|
|
End user metadata queries
|
|
-------------------------
|
|
|
|
.. versionadded:: Luminous
|
|
|
|
Since the ElasticSearch cluster now stores object metadata, it is important that
|
|
the ElasticSearch endpoint is not exposed to the public and only accessible to
|
|
the cluster administrators. For exposing metadata queries to the end user itself
|
|
this poses a problem since we'd want the user to only query their metadata and
|
|
not of any other users, this would require the ElasticSearch cluster to
|
|
authenticate users in a way similar to RGW does which poses a problem.
|
|
|
|
As of Luminous RGW in the metadata master zone can now service end user
|
|
requests. This allows for not exposing the elasticsearch endpoint in public and
|
|
also solves the authentication and authorization problem since RGW itself can
|
|
authenticate the end user requests. For this purpose RGW introduces a new query
|
|
in the bucket apis that can service elasticsearch requests. All these requests
|
|
must be sent to the metadata master zone.
|
|
|
|
Syntax
|
|
~~~~~~
|
|
|
|
Get an elasticsearch query
|
|
``````````````````````````
|
|
|
|
::
|
|
|
|
GET /{bucket}?query={query-expr}
|
|
|
|
request params:
|
|
- max-keys: max number of entries to return
|
|
- marker: pagination marker
|
|
|
|
``expression := [(]<arg> <op> <value> [)][<and|or> ...]``
|
|
|
|
op is one of the following:
|
|
<, <=, ==, >=, >
|
|
|
|
For example ::
|
|
|
|
GET /?query=name==foo
|
|
|
|
Will return all the indexed keys that user has read permission to, and
|
|
are named 'foo'.
|
|
|
|
Will return all the indexed keys that user has read permission to, and
|
|
are named 'foo'.
|
|
|
|
The output will be a list of keys in XML that is similar to the S3
|
|
list buckets response.
|
|
|
|
Configure custom metadata fields
|
|
````````````````````````````````
|
|
|
|
Define which custom metadata entries should be indexed (under the
|
|
specified bucket), and what are the types of these keys. If explicit
|
|
custom metadata indexing is configured, this is needed so that rgw
|
|
will index the specified custom metadata values. Otherwise it is
|
|
needed in cases where the indexed metadata keys are of a type other
|
|
than string.
|
|
|
|
::
|
|
|
|
POST /{bucket}?mdsearch
|
|
x-amz-meta-search: <key [; type]> [, ...]
|
|
|
|
Multiple metadata fields must be comma separated, a type can be forced for a
|
|
field with a `;`. The currently allowed types are string(default), integer and
|
|
date
|
|
|
|
eg. if you want to index a custom object metadata x-amz-meta-year as int,
|
|
x-amz-meta-date as type date and x-amz-meta-title as string, you'd do
|
|
|
|
::
|
|
|
|
POST /mybooks?mdsearch
|
|
x-amz-meta-search: x-amz-meta-year;int, x-amz-meta-release-date;date, x-amz-meta-title;string
|
|
|
|
|
|
Delete custom metadata configuration
|
|
````````````````````````````````````
|
|
|
|
Delete custom metadata bucket configuration.
|
|
|
|
::
|
|
|
|
DELETE /<bucket>?mdsearch
|
|
|
|
Get custom metadata configuration
|
|
`````````````````````````````````
|
|
|
|
Retrieve custom metadata bucket configuration.
|
|
|
|
::
|
|
|
|
GET /<bucket>?mdsearch
|
|
|
|
|
|
.. _`Elasticsearch`: https://github.com/elastic/elasticsearch
|