ceph/doc/radosgw/s3-notification-compatibility.rst

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=====================================
S3 Bucket Notifications Compatibility
=====================================
Ceph's `PubSub module`_ follows `AWS S3 Bucket Notifications API`_. However, some differences exist, as listed below.
Supported Destination
----------------------
AWS supports: **SNS**, **SQS** and **Lambda** as possible destinations (AWS internal destinations).
Currently, we support: **HTTP/S** and **AMQP**. And also support pulling and acking of events stored in Ceph (as an intenal destination).
We are using the SNS ARNs to represent these destinations.
Notification Configuration XML
------------------------------
Following tags (and the tags inside them) are not supported:
+-----------------------------------+----------------------------------------------+
| Tag | Remaks |
+===================================+==============================================+
| ``<QueueConfiguration>`` | not needed, we treat all destinations as SNS |
+-----------------------------------+----------------------------------------------+
| ``<CloudFunctionConfiguration>`` | not needed, we treat all destinations as SNS |
+-----------------------------------+----------------------------------------------+
| ``<Filter>`` | object filtering not supported |
+-----------------------------------+----------------------------------------------+
REST API Extension
------------------
Ceph's bucket notification API follows has the following extensions:
- Deletion of a specific notification, or all notifications on a bucket, without deletion of the bucket
- Getting the information on a specific notification (when some exists on a bucket)
Unsupported Fields in the Event Record
--------------------------------------
The records sent for bucket notification follow format described in: `Event Message Structure`_.
However, the following fields are sent empty:
+----------------------------------------+-------------------------------------------------------------+
| Field | Description |
+========================================+=============================================================+
| ``userIdentity.principalId`` | The identity of the user that triggered the event |
+----------------------------------------+-------------------------------------------------------------+
| ``requestParameters.sourceIPAddress`` | The IP address of the client that triggered the event |
+----------------------------------------+-------------------------------------------------------------+
| ``requestParameters.x-amz-request-id`` | The request id that triggered the event |
+----------------------------------------+-------------------------------------------------------------+
| ``requestParameters.x-amz-id-2`` | The IP address of the RGW on which the event was triggered |
+----------------------------------------+-------------------------------------------------------------+
| ``s3.object.size`` | The size of the object |
+----------------------------------------+-------------------------------------------------------------+
Event Types
-----------
+----------------------------------------------+-----------------+-------------------------------------------+
| Event | Status | Remarks |
+==============================================+=================+===========================================+
| ``s3:ObjectCreated:*`` | Supported | |
+----------------------------------------------+-----------------+-------------------------------------------+
| ``s3:ObjectCreated:Put`` | Supported | supported at ``s3:ObjectCreated:*`` level |
+----------------------------------------------+-----------------+-------------------------------------------+
| ``s3:ObjectCreated:Post`` | Not Supported | start of multi-part upload not supported |
+----------------------------------------------+-----------------+-------------------------------------------+
| ``s3:ObjectCreated:Copy`` | Supported | supported at ``s3:ObjectCreated:*`` level |
+----------------------------------------------+-----------------+-------------------------------------------+
| ``s3:ObjectCreated:CompleteMultipartUpload`` | Supported | supported at ``s3:ObjectCreated:*`` level |
+----------------------------------------------+-----------------+-------------------------------------------+
| ``s3:ObjectRemoved:*`` | Supported | |
+----------------------------------------------+-----------------+-------------------------------------------+
| ``s3:ObjectRemoved:Delete`` | Supported | supported at ``s3:ObjectRemoved:*`` level |
+----------------------------------------------+-----------------+-------------------------------------------+
| ``s3:ObjectRemoved:DeleteMarkerCreated`` | Supported | supported at ``s3:ObjectRemoved:*`` level |
+----------------------------------------------+-----------------+-------------------------------------------+
| ``s3:ObjectRestore:Post`` | Not Supported | not applicable to Ceph |
+----------------------------------------------+-----------------+-------------------------------------------+
| ``s3:ObjectRestore:Complete`` | Not Supported | not applicable to Ceph |
+----------------------------------------------+-----------------+-------------------------------------------+
| ``s3:ReducedRedundancyLostObject`` | Not Supported | not applicable to Ceph |
+----------------------------------------------+-----------------+-------------------------------------------+
.. _AWS S3 Bucket Notifications API: https://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html
.. _Event Message Structure: https://docs.aws.amazon.com/AmazonS3/latest/dev/notification-content-structure.html
.. _`PubSub module`: ../pubsub-module