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Well, I guess your map is just too big. Its size will be about 9MB. Is your map really that big? If not, look at the patch attached to this ticket.

If you need the map just for visualization, you could implement a proxy that compresses it, e.g. as a PNG file. You can find some code doing this in the rosjava project, repository google, package name compressed_visualization_transport. This solution would probably require some work though.