ODL cluster including node A and B
1. install feature odl-mdsal-clustering,odl-dluxapps-yangui and bundle org.opendaylight.controller.samples/sample-toaster/1.5.1-Carbon on node A,start this bundle
2. install feature odl-mdsal-all on Node B.
3. open web explorer and login in dlux on Node A
4. call rpc /operations/toaster:cancel-toast

you will see:
Error sending request - : No implementation of RPC AbsoluteSchemaPath

{path=[(http://netconfcentral.org/ns/toaster?revision=2009-11-19)cancel-toast]}

available on web explorer.

AND

2017-09-10 20:53:06,785 | ERROR | lt-dispatcher-42 | RpcInvoker | 197 - org.opendaylight.controller.sal-clustering-commons - 1.5.1.Carbon | Failed to execute RPC (http://netconfcentral.org/ns/toaster?revision=2009-11-19)cancel-toast due to org.opendaylight.controller.md.sal.dom.api.DOMRpcImplementationNotAvailableException: No implementation of RPC AbsoluteSchemaPath

{path=[(http://netconfcentral.org/ns/toaster?revision=2009-11-19)cancel-toast]}

available. More details are available on DEBUG level. on NodeB's karaf.log

Reason:
"revision=2009-11-19" is wrong.

In fact,in toaster.yang,defined as below:
revision "2009-11-20"

{ description "Toaster module in progress."; }