HDFS-12047. Ozone: Add REST API documentation. Contributed by Weiwei Yang.
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Weiwei Yang
Owen O'Malley
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hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/OzoneRest.md
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hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/OzoneRest.md
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<!---
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License. See accompanying LICENSE file.
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-->
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Ozone REST API's.
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===================
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<!-- MACRO{toc|fromDepth=0|toDepth=1} -->
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Overview
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--------
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The Ozone REST API's allows user to access ozone via REST protocol.
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Authentication and Authorization
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--------------------
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For time being, The default authentication mode of REST API is insecure access
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mode, which is *Simple* mode. Under this mode, ozone server trusts the user
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name specified by client and it does not perform any authentication.
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User name can be specified in HTTP header by
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* `x-ozone-user: {USER_NAME}`
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for example if add following header *x-ozone-user: bilbo* in the HTTP request,
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then operation will be executed as *bilbo* user.
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In *Simple* mode, there is no real authorization either. Client can be
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authorized to obtain administrator privilege by using HTTP header
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* `Authorization: {AUTH_METHOD} {SIGNATURE}`
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for example set following header *Authorization: OZONE root* in the HTTP request,
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then ozone will authorize the client with administrator privilege.
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Common REST Headers
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--------------------
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The following HTTP headers must be set for each REST call.
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| Property | Description |
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|:---- |:----
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| Authorization | The authorization field determines which authentication method is used by ozone. Currently only *simple* mode is supported, the corresponding value is *OZONE*. Optionally an user name can be set as *OZONE {USER_NAME}* to authorize as a particular user. |
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| Date | Standard HTTP header that represents dates. The format is - day of the week, month, day, year and time (military time format) in GMT. Any other time zone will be rejected by ozone server. Eg. *Date : Mon, Apr 4, 2016 06:22:00 GMT*. This field is required. |
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| x-ozone-version | A required HTTP header to indicate which version of API this call will be communicating to. E.g *x-ozone-version: v1*. Currently ozone only publishes v1 version API. |
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Common Reply Headers
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--------------------
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The common reply headers are part of all Ozone server replies.
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| Property | Description |
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|:---- |:----
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| Date | This is the HTTP date header and it is set to server’s local time expressed in GMT. |
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| x-ozone-request-id | This is a UUID string that represents an unique request ID. This ID is used to track the request through the ozone system and is useful for debugging purposes. |
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| x-ozone-server-name | Fully qualified domain name of the sever which handled the request. |
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Volume APIs
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--------------------
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### Create a Volume
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This API allows admins to create a new storage volume.
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Schema:
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- `POST /{volume}?quota=<VOLUME_QUOTA>`
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Query Parameter:
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| Query Parameter | Value | Description |
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|:---- |:---- |:----
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| quota | long<BYTES \| MB \| GB \| TB> | Optional. Quota size in BYTEs, MBs, GBs or TBs |
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Sample HTTP POST request:
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curl -i -X POST -H "x-ozone-user: bilbo" -H "x-ozone-version: v1" -H "Date: Mon, 26 Jun 2017 04:23:30 GMT" -H "Authorization:OZONE root" "http://localhost:9864/volume-to-create"
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this request creates a volume as user *bilbo*, the authorization field is set to *OZONE root* because this call requires administration privilege. The client receives a response with zero content length.
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HTTP/1.1 201 Created
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x-ozone-server-name: localhost
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x-ozone-request-id: 2173deb5-bbb7-4f0a-8236-f354784e3bae
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Date: Tue, 27 Jun 2017 07:42:04 GMT
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Content-Type: application/octet-stream
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Content-Length: 0
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Connection: keep-alive
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### Update Volume
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This API allows administrators to update volume info such as ownership and quota. This API requires administration privilege.
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Schema:
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- `PUT /{volume}?quota=<VOLUME_QUOTA>`
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Query Parameter:
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| Query Parameter | Value | Description |
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|:---- |:---- |:----
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| quota | long<BYTES \| MB \| GB \| TB> \| remove | Optional. Quota size in BYTEs, MBs, GBs or TBs. Or use string value *remove* to remove an existing quota for a volume. |
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Sample HTTP PUT request:
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curl -X PUT -H "Authorization:OZONE root" -H "Date: Mon, 26 Jun 2017 04:23:30 GMT" -H "x-ozone-version: v1" -H "x-ozone-user: john" http://localhost:9864/volume-to-update
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this request modifies the owner of */volume-to-update* to *john*.
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### Delete Volume
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This API allows user to delete a volume owned by themselves if the volume is not empty. Administrators can delete volumes owned by any user.
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Schema:
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- `DELETE /{volume}`
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Sample HTTP DELETE request:
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curl -i -X DELETE -H "Authorization:OZONE root" -H "Date: Mon, 26 Jun 2017 04:23:30 GMT" -H "x-ozone-version: v1" -H "x-ozone-user: bilbo" http://localhost:9864/volume-to-delete
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this request deletes an empty volume */volume-to-delete*. The client receives a zero length content.
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HTTP/1.1 200 OK
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x-ozone-server-name: localhost
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x-ozone-request-id: 6af14c64-e3a9-40fe-9634-df60b7cbbc6a
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Date: Tue, 27 Jun 2017 08:49:52 GMT
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Content-Type: application/octet-stream
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Content-Length: 0
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Connection: keep-alive
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### Info Volume
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This API allows user to read the info of a volume owned by themselves. Administrators can read volume info owned by any user.
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Schema:
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- `GET /{volume}?info=volume`
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Query Parameter:
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| Query Parameter | Value | Description |
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|:---- |:---- |:----
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| info | "volume" | Required and enforced with this value. |
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Sample HTTP GET request:
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curl -i -H "x-ozone-user: bilbo" -H "x-ozone-version: v1" -H "Date: Mon, 26 Jun 2017 04:23:30 GMT" -H "Authorization:OZONE" "http://localhost:9864/volume-of-bilbo?info=volume"
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this request gets the info of volume */volume-of-bilbo*, the client receives a response with a JSON object of volume info.
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HTTP/1.1 200 OK
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x-ozone-server-name: localhost
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x-ozone-request-id: a2224806-beaf-42dd-a68e-533cd7508f74
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Date: Tue, 27 Jun 2017 07:55:35 GMT
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Content-Type: application/octet-stream
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Content-Length: 171
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Connection: keep-alive
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{
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"owner" : { "name" : "bilbo" },
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"quota" : { "unit" : "TB", "size" : 1048576 },
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"volumeName" : "volume-of-bilbo",
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"createdOn" : null,
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"createdBy" : "root"
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}
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### List Volumes
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This API allows user to list all volumes owned by themselves. Administrators can list all volumes owned by any user.
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Schema:
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- `GET /?prefix=<PREFIX>&max-keys=<MAX_RESULT_SIZE>&prev-key=<VOLUME_TO_START_LISTING_FROM>`
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Query Parameter:
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| Query Parameter | Value | Description |
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|:---- |:---- |:----
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| prefix | string | Optional. Only volumes with this prefix are included in the result. |
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| max-keys | int | Optional. Maximum number of volumes included in the result. Default is 1024 if not specified. |
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| prev-key | string | Optional. Volume name where to start listing from. It must be a valid volume name. |
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| root-scan | bool | Optional. List all volumes in the cluster if this is set to true. Default false. |
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Sample HTTP GET request:
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curl -i -H "x-ozone-user: bilbo" -H "x-ozone-version: v1" -H "Date: Mon, 26 Jun 2017 04:23:30 GMT" -H "Authorization:OZONE" "http://localhost:9864/?max-keys=100&prefix=Jan"
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this request gets all volumes owned by *bilbo* and each volume's name contains prefix *Jan*, the result at most contains *100* entries. The client receives a list of SON objects, each of them describes the info of a volume.
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HTTP/1.1 200 OK
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x-ozone-server-name: localhost
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x-ozone-request-id: 7fa0dce1-a8bd-4387-bc3c-1dac4b710bb1
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Date: Tue, 27 Jun 2017 08:07:04 GMT
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Content-Type: application/octet-stream
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Content-Length: 602
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Connection: keep-alive
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{
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"volumes" : [
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{
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"owner" : { "name" : "bilbo"},
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"quota" : { "unit" : "TB", "size" : 2 },
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"volumeName" : "Jan-vol1",
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"createdOn" : null,
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"createdBy" : root
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},
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...
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]
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}
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Bucket APIs
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--------------------
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### Create Bucket
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This API allows an user to create a bucket in a volume.
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Schema:
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- `POST /{volume}/{bucket}`
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Additional HTTP Headers:
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| HTTP Header | Value | Description |
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|:---- |:---- |:----
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| x-ozone-acl | ozone ACLs | Optional. Ozone acls. |
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| x-ozone-storage-class | <DEFAULT \| ARCHIVE \| DISK \| RAM_DISK \| SSD > | Optional. Storage type for a volume. |
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| x-ozone-bucket-versioning | enabled/disabled | Optional. Do enable bucket versioning or not. |
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Sample HTTP POST request:
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curl -i -X POST -H "x-ozone-user: bilbo" -H "x-ozone-version: v1" -H "Date: Mon, 26 Jun 2017 04:23:30 GMT" -H "Authorization:OZONE" http://localhost:9864/volume-of-bilbo/bucket-0
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this request creates a bucket *bucket-0* under volume *volume-of-bilbo*.
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HTTP/1.1 201 Created
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x-ozone-server-name: localhost
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x-ozone-request-id: 49acfeec-4c85-470a-872b-2eaebd8d751e
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Date: Tue, 27 Jun 2017 08:55:25 GMT
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Content-Type: application/octet-stream
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Content-Length: 0
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Connection: keep-alive
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### Update Bucket
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Updates bucket meta-data, like ACLs.
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Schema:
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- `PUT /{volume}/{bucket}`
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Additional HTTP Headers:
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| HTTP Header | Value | Description |
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|:---- |:---- |:----
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| x-ozone-acl | ozone ACLs | Optional. Ozone acls. |
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| x-ozone-bucket-versioning | enabled/disabled | Optional. Do enable bucket versioning or not. |
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Sample HTTP PUT request:
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curl -i -X PUT -H "x-ozone-user: bilbo" -H "x-ozone-version: v1" -H "Date: Mon, 26 Jun 2017 04:23:30 GMT" -H "Authorization:OZONE" -H "x-ozone-acl: ADD user:peregrin:rw" http://localhost:9864/volume-of-bilbo/bucket-to-update
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this request adds an ACL policy specified by HTTP header *x-ozone-acl* to bucket */volume-of-bilbo/bucket-to-update*, the ACL field *ADD user:peregrin:rw* gives add additional read/write permission to user *peregrin* to this bucket.
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HTTP/1.1 200 OK
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x-ozone-server-name: localhost
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x-ozone-request-id: b061a295-5faf-4b98-94b9-8b3e87c8eb5e
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Date: Tue, 27 Jun 2017 09:02:37 GMT
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Content-Type: application/octet-stream
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Content-Length: 0
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Connection: keep-alive
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### Delete Bucket
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Deletes a bucket if it is empty. An user can only delete bucket owned by themselves, and administrators can delete buckets owned by any user, as long as it is empty.
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Schema:
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- `DELETE /{volume}/{bucket}`
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Sample HTTP DELETE request:
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curl -i -X DELETE -H "Authorization:OZONE root" -H "Date: Mon, 26 Jun 2017 04:23:30 GMT" -H "x-ozone-version: v1" -H "x-ozone-user:bilbo" "http://localhost:9864/volume-of-bilbo/bucket-0"
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this request deletes bucket */volume-of-bilbo/bucket-0*. The client receives a zero length content response.
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HTTP/1.1 200 OK
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x-ozone-server-name: localhost
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x-ozone-request-id: f57acd7a-2116-4c2f-aa2f-5a483db81c9c
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Date: Tue, 27 Jun 2017 09:16:52 GMT
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Content-Type: application/octet-stream
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Content-Length: 0
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Connection: keep-alive
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### Info Bucket
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This API returns information about a given bucket.
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Schema:
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- `GET /{volume}/{bucket}?info=bucket`
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Query Parameters:
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| Query Parameter | Value | Description |
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|:---- |:---- |:----
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| info | "bucket" | Required and enforced with this value. |
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Sample HTTP GET request:
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curl -i -H "x-ozone-user: bilbo" -H "x-ozone-version: v1" -H "Date: Mon, 26 Jun 2017 04:23:30 GMT" -H "Authorization:OZONE" "http://localhost:9864/volume-of-bilbo/bucket-0?info=bucket"
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this request gets the info of bucket */volume-of-bilbo/bucket-0*. The client receives a response of JSON object contains bucket info.
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HTTP/1.1 200 OK
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x-ozone-server-name: localhost
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x-ozone-request-id: f125485b-8cae-4c7f-a2d6-5b1fefd6f193
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Date: Tue, 27 Jun 2017 09:08:31 GMT
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Content-Type: application/json
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Content-Length: 138
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Connection: keep-alive
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{
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"volumeName" : "volume-of-bilbo",
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"bucketName" : "bucket-0",
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"acls" : [ ],
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"versioning" : "DISABLED",
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"storageType" : "DISK"
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}
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### List Buckets
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List buckets in a given volume.
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Schema:
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- `GET /{volume}?prefix=<PREFIX>&max-keys=<MAX_RESULT_SIZE>&prev-key=<BUCKET_TO_START_LISTING_FROM>`
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Query Parameters:
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| Query Parameter | Value | Description |
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|:---- |:---- |:----
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| prefix | string | Optional. Only buckets with this prefix are included in the result. |
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| max-keys | int | Optional. Maximum number of buckets included in the result. Default is 1024 if not specified. |
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| prev-key | string | Optional. Bucket name where to start listing from. It must be a valid bucket name. |
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Sample HTTP GET request:
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curl -i -H "x-ozone-user: bilbo" -H "x-ozone-version: v1" -H "Date: Mon, 26 Jun 2017 04:23:30 GMT" -H "Authorization:OZONE" "http://localhost:9864/volume-of-bilbo?max-keys=10"
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this request lists all the buckets under volume *volume-of-bilbo*, and the result at most contains 10 entries. The client receives response of a array of JSON objects, each of them represents for a bucket info.
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HTTP/1.1 200 OK
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x-ozone-server-name: localhost
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x-ozone-request-id: e048c3d5-169c-470f-9903-632d9f9e32d5
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Date: Tue, 27 Jun 2017 09:12:18 GMT
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Content-Type: application/octet-stream
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Content-Length: 207
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Connection: keep-alive
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{
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"buckets" : [ {
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"volumeName" : "volume-of-bilbo",
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"bucketName" : "bucket-0",
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"acls" : [ ],
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"versioning" : null,
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"storageType" : "DISK",
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"bytesUsed" : 0,
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"keyCount" : 0
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},
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...
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]
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}
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Key APIs
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------------------
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### Put Key
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This API allows user to create or overwrite keys inside of a bucket.
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Schema:
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- `PUT /{volume}/{bucket}/{key}`
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Additional HTTP headers:
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| HTTP Header | Value | Description |
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|:---- |:---- |:----
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| Content-MD5 | MD5 digest | Standard HTTP header, file hash. |
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Sample PUT HTTP request:
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curl -X PUT -T /path/to/localfile -H "Authorization:OZONE" -H "Date: Mon, 26 Jun 2017 04:23:30 GMT" -H "x-ozone-version: v1" -H "x-ozone-user:bilbo" "http://localhost:9864/volume-of-bilbo/bucket-0/file-0"
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this request uploads a local file */path/to/localfile* specified by option *-T* to ozone as user *bilbo*, mapped to ozone key */volume-of-bilbo/bucket-0/file-0*. The client receives a zero length content response.
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### Get Key
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This API allows user to get or download a key from an ozone bucket.
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Schema:
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- `GET /{volume}/{bucket}/{key}`
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Sample HTTP GET request:
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curl -i -H "x-ozone-user: bilbo" -H "x-ozone-version: v1" -H "Date: Mon, 26 Jun 2017 04:23:30 GMT" -H "Authorization:OZONE" "http://localhost:9864/volume-of-bilbo/bucket-0/file-0"
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this request reads the content of key */volume-of-bilbo/bucket-0/file-0*. If the content of the file is plain text, it can be directly dumped onto stdout.
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HTTP/1.1 200 OK
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Content-Type: application/octet-stream
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x-ozone-server-name: localhost
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||||
x-ozone-request-id: 1bcd7de7-d8e3-46bb-afee-bdc933d383b8
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Date: Tue, 27 Jun 2017 09:35:29 GMT
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Content-Length: 6
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Connection: keep-alive
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Hello Ozone!
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if the file is not plain text, specify *-O* option in curl command and the file *file-0* will be downloaded into current working directory, file name will be same as the key. A sample request like following:
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|
||||
curl -O -i -H "x-ozone-user: bilbo" -H "x-ozone-version: v1" -H "Date: Mon, 26 Jun 2017 04:23:30 GMT" -H "Authorization:OZONE" "http://localhost:9864/volume-of-bilbo/bucket-0/file-1"
|
||||
|
||||
response looks like following:
|
||||
|
||||
% Total % Received % Xferd Average Speed Time Time Time Current
|
||||
Dload Upload Total Spent Left Speed
|
||||
100 6148k 100 6148k 0 0 24.0M 0 --:--:-- --:--:-- --:--:-- 24.1M
|
||||
|
||||
### Delete Key
|
||||
|
||||
This API allows user to delete a key from a bucket.
|
||||
|
||||
Schema:
|
||||
|
||||
- `DELETE /{volume}/{bucket}/{key}`
|
||||
|
||||
Sample HTTP DELETE request:
|
||||
|
||||
curl -i -X DELETE -H "Authorization:OZONE root" -H "Date: Mon, 26 Jun 2017 04:23:30 GMT" -H "x-ozone-version: v1" -H "x-ozone-user:bilbo" "http://localhost:9864/volume-of-bilbo/bucket-0/file-0"
|
||||
|
||||
this request deletes key */volume-of-bilbo/bucket-0/file-0*. The client receives a zero length content result:
|
||||
|
||||
HTTP/1.1 200 OK
|
||||
x-ozone-server-name: localhost
|
||||
x-ozone-request-id: f8c4a373-dd5f-4e3a-b6c4-ddf7e191fe91
|
||||
Date: Tue, 27 Jun 2017 14:19:48 GMT
|
||||
Content-Type: application/octet-stream
|
||||
Content-Length: 0
|
||||
Connection: keep-alive
|
||||
|
||||
### List Keys
|
||||
|
||||
This API allows user to list keys in a bucket.
|
||||
|
||||
Schema:
|
||||
|
||||
- `GET /{volume}/{bucket}?prefix=<PREFIX>&max-keys=<MAX_RESULT_SIZE>&prev-key=<KEY_TO_START_LISTING_FROM>`
|
||||
|
||||
Query Parameters:
|
||||
|
||||
| Query Parameter | Value | Description |
|
||||
|:---- |:---- |:----
|
||||
| prefix | string | Optional. Only keys with this prefix are included in the result. |
|
||||
| max-keys | int | Optional. Maximum number of keys included in the result. Default is 1024 if not specified. |
|
||||
| prev-key | string | Optional. Key name where to start listing from. It must be a valid key name. |
|
||||
|
||||
Sample HTTP GET request:
|
||||
|
||||
curl -i -H "x-ozone-user: bilbo" -H "x-ozone-version: v1" -H "Date: Mon, 26 Jun 2017 04:23:30 GMT" -H "Authorization:OZONE" "http:/localhost:9864/volume-of-bilbo/bucket-0/?max-keys=100&prefix=file"
|
||||
|
||||
this request list keys under bucket */volume-of-bilbo/bucket-0*, the listing result is filtered by prefix *file*. The client receives an array of JSON objects, each of them represents the info of a matched key.
|
||||
|
||||
HTTP/1.1 200 OK
|
||||
x-ozone-server-name: localhost
|
||||
x-ozone-request-id: 7f9fc970-9904-4c56-b671-83a086c6f555
|
||||
Date: Tue, 27 Jun 2017 09:48:59 GMT
|
||||
Content-Type: application/json
|
||||
Content-Length: 209
|
||||
Connection: keep-alive
|
||||
|
||||
{
|
||||
"name" : null,
|
||||
"prefix" : file,
|
||||
"maxKeys" : 0,
|
||||
"truncated" : false,
|
||||
"keyList" : [ {
|
||||
"version" : 0,
|
||||
"md5hash" : null,
|
||||
"createdOn" : null,
|
||||
"size" : 0,
|
||||
"keyName" : "file-0"
|
||||
},
|
||||
...
|
||||
]
|
||||
}
|
||||
@ -112,6 +112,7 @@
|
||||
<menu name="Ozone" inherit="top">
|
||||
<item name="Getting Started" href="hadoop-project-dist/hadoop-hdfs/OzoneGettingStarted.html"/>
|
||||
<item name="Commands Reference" href="hadoop-project-dist/hadoop-hdfs/OzoneCommandShell.html"/>
|
||||
<item name="Ozone Rest API" href="hadoop-project-dist/hadoop-hdfs/OzoneRest.html"/>
|
||||
<item name="Ozone Metrics" href="hadoop-project-dist/hadoop-hdfs/OzoneMetrics.html"/>
|
||||
</menu>
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user