Repository synchronization in a ranked repository cluster

An article of manufacture comprising a non-transitory machine readable medium having content stored thereon to provide instructions to cause a device to perform operations including:

• polling, from a first repository to a second repository, for a change message published by the second repository, the first and second repositories to participate in a cluster of ranked repositories, where higher ranking is favored if the change message indicates an object state conflict;
• reading the change message from the second repository to receive the change message;
• determining at the first repository whether the change message has previously been received at the first repository by reading a value identifying the change message;
• and
• terminating the change message at the first repository in response to determining the change message is previously known to the first repository;
• otherwise
• sending a change message from the first repository to another repository in the cluster in response to receiving the change message.

A data repository comprising:

• a communication interface to receive a change message from a publisher repository, the data repository and the publisher repositories having a ranking in a cluster or repositories, the change message indicating a change to shared data, where higher ranking is favored if the change message indicates an object state conflict;
• a change message processor coupled to the communication interface, the change message processor comprising circuitry executing with a memory to determine whether the change message is previously known to the data repository including reading a value identifying the change message, and terminate the change message in response to determining the change message is previously known;
• and
• a publishing module coupled to the change message processor to republish the change message to another data repository in the cluster if the change message is not previously known.

A system of repositories comprising:

• a publisher repository having a first rank, and including
• a communication interface to send a first change message indicating a change to virtual data of the system, and to receive a second change message,
• a change message processor comprising circuitry executing with a memory to determine whether the second change message is previously known to the publisher repository including reading a value identifying the change message, and terminate the change message in response to determining the change message is previously known, and
• a publishing module to republish the second change message if the second change message is not previously known;
• and
• a subscriber repository being a subscriber of the publisher repository having a second rank, and including
• a communication interface to receive the first change message,
• a change message processor to determine whether the first change message is previously known to the subscriber repository including reading a value identifying the change message, and terminate the change message in response to determining the change message is previously known, and
• a publishing module to republish the first change message if the first change message is not previously known
• wherein the first and second rank may be the same or different, and wherein higher ranking is favored if a change message indicates an object state conflict.