The methods are relative to the base URI, e.g., @/arvados/v1/resource_type@. For arguments specifying a *Location* of @path@, the value of the argument is incorporated into the path portion of the URI. For example, a @uuid@ of @aaaaa-bbbbb-ccccccccccccccc@ in a path position yields a URI of @/arvados/v1/resource_type/aaaaa-bbbbb-ccccccccccccccc@.
-Arguments specifying a *Location* of @query@ are incorporated into the query portion of the URI or request body. For example, @/arvados/v1/resource_type?resource_type={}@.
+Arguments specifying a *Location* of "query" are incorporated into the query portion of the URI or request body. For example, @/arvados/v1/resource_type?count=none@.
+
+Certain method calls on certain object types support "federation":{{site.baseurl}}/architecture/federation.html , that is, the ability to operate on objects owned by different clusters. API pages for specific object types list which federated operations are supported for that type (if any) in the "Methods" section.
h2. create
This method corresponds to the HTTP request @POST /arvados/v1/resource_type@. A successful create call returns a copy of the new object.
+To create an object on a remote cluster (federated create), provide the @cluster_id@ of the target cluster.
+
Arguments:
table(table table-bordered table-condensed).
|_. Argument |_. Type |_. Description |_. Location |
-|{resource_type}|object|Name is the singular form of the resource type, e.g., for the "collections" resource, this argument is "collection"|query||
+|{resource_type}|object|Name is the singular form of the resource type, e.g., for the "collections" resource, this argument is "collection"|body||
+|{cluster_id}|string|Optional, the cluster on which to create the object if not the current cluster.|query||
h2. delete
The @delete@ method deletes an object of the specified type. It corresponds to the HTTP request @DELETE /arvados/v1/resource_type/uuid@. A successful delete call returns a copy of the deleted object.
+The cluster id portion of the @uuid@ is used to determine which cluster owns the object, a federated delete request will be routed to that cluster.
+
Arguments:
table(table table-bordered table-condensed).
The @get@ method gets a single object with the specified @uuid@. It corresponds to the HTTP request @GET /arvados/v1/resource_type/uuid@.
+The cluster id portion of the @uuid@ is used to determine which cluster owns the object, a federated get request will be routed to that cluster.
+
Arguments:
table(table table-bordered table-condensed).
Note that exclusion filters @!=@ and @not in@ will return records for which the property is not defined at all. To restrict filtering to records on which the subproperty is defined, combine with an @exists@ filter.
+h4. Federated listing
+
+Federated listing forwards a request to multiple clusters and combines the results. Currently only a very restricted form of the "list" method is supported.
+
+To query multiple clusters, the list method must:
+
+* Have filters only matching @[["uuid", "in", [...]]@ or @["uuid", "=", "..."]@
+* Must specify @count=none@
+* If @select@ is specified, it must include @uuid@
+* Must not specify @limit@, @offset@ or @order@
+* Must not request more items than the maximum response size
+
+This form may be used to request a specific list of objects by uuid which are owned by multiple clusters.
+
h3. Results of list method
A successful call to list will return the following object.
The @update@ method updates fields on the object with the specified @uuid@. It corresponds to the HTTP request @PUT /arvados/v1/resource_type/uuid@. Note that only the listed attributes (and "standard metadata":resources.html) are updated, unset attributes will retain their previous values, and the attributes of a given resource type are fixed (you cannot introduce new toplevel attributes). Also note that updates replace the value of the attribute, so if an attribute has an object value, the entire object is replaced. A successful update call returns the updated copy of the object.
+The cluster id portion of the @uuid@ is used to determine which cluster owns the object, a federated update request will be routed to that cluster.
+
table(table table-bordered table-condensed).
|_. Argument |_. Type |_. Description |_. Location |
{background:#ccffcc}.|uuid|string|The UUID of the resource in question.|path||
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