Dell DX6012S Przegląd - Strona 8

Note

Because you are working with the default cluster domain, the domain name does not

need to be sent as the Host in the request. For unnamed objects, POST authentication

is supported only in the default cluster domain.

• Remote synchronous write POST of an unnamed object to the default cluster domain, which has

POST authentication enabled

POST /_proxy/cluster-name/?replicate=immediate

For more information about remote synchronous write, see the next section.

1.2.2. Remote Synchronous Writes and Updates

Remote Synchronous Write enables you to write or update a copy of the same stream both locally

and remotely as part of the same request.

A Remote Synchronous Write first writes two copies of the object to the local cluster. If the local

write fails for any reason, the error response is returned to the requestor and the operation is

abandoned.

If the local write succeeds, the Proxy writes the updated object to the specified remote cluster.

This request is authenticated using the DX Storage administrator credentials specified in the

configuration of the remote cluster.

All query arguments except alias=yes as well as the Expect: Content-MD5 header are stripped

from the remote write to simplify the response coordination between the two clusters.

If the remote write is also successful, a 201 (Created) response is returned to the requestor. If the

remote write fails for any reason, a 202 (Accept) response is returned, indicating that only the local

write was successful and that remote replication can occur at a later time using DX Content Router

(if enabled).

The Proxy has an AggregateInfo method to validate that a set of content exists in a cluster.

Aggregate Info can be issued against a local cluster but it is usually used to validate remote

replication.

You determine the desired data set by first creating a "consistency checkpoint" using the following

format, terminated with CRLF:

{uuid [mutable | immutable] | url-encoded-name}

For unnamed anchor streams, you must use mutable parameter. (The default, with no parameter

specified, is immutable.)

All named objects are assumed to be mutable so no argument is required.

You must supply a list of either URL-encoded names or UUIDs. (Use

names, if needed.) The name, UUID, or the consistency checkpoint, is stored as a DX Storage

object.

Info requests in the AggregateInfo method are issued for each name or UUID in the consistency

checkpoint and either object metadata or an error response is returned in the concatenated

percent encoding

for object

Version 1.2

December 2010