Retrieving messages in order in a distributed publish/subscribe system

A system for retrieving, in order, a plurality of specific topic-based messages in a distributed publish/subscribe environment, the distributed publish/subscribe environment comprising at least one message transit server, the system comprising:

• order determining hardware means configured to determine an order of a plurality of messages that are planned for retrieval, wherein the order describes a time order in which each message, from the plurality of messages, is planned for retrieval compared to other messages from the plurality of messages;
• recording hardware means configured to record message transit server sequence information for message transit servers where each of the plurality of messages is respectively located, wherein the message transit server sequence information describes an order, of the message transit servers, that corresponds to a determined time order of the plurality of messages;
• and
• message retrieving hardware means configured to retrieve in said order of the message transit servers, the plurality of messages from corresponding message transit servers using the message transit server sequence information.

A computer program product for retrieving, in order, a plurality of specific topic-based messages in a distributed publish/subscribe system, the distributed publish/subscribe system comprising at least one message transit server, the computer program product comprising a computer readable storage medium having program code embodied therewith, the program code readable and executable by a processor to perform a method comprising:

• determining an order of a plurality of messages that are planned for retrieval, wherein the order describes a time order in which each message, from the plurality of messages, is planned for retrieval compared to other messages from the plurality of messages;
• recording message transit server sequence information for message transit servers where each of the plurality of messages is respectively located, wherein the message transit server sequence information describes an order, of the message transit servers, that corresponds to a determined time order of the plurality of messages;
• and
• retrieving, in said order of the message transit servers, the plurality of messages from corresponding message transit servers using the message transit server sequence information.