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What does the error message "feature set mismatch missing 1000000000000" in Ceph logs mean?

Solution Verified - Updated 2015-11-27T06:57:05+00:00 -

Issue

What does the following messages in Ceph client logs mean?

connect protocol feature mismatch, my 2fffffffffff < peer 12fffffffffff missing 1000000000000

Environment

Red Hat Ceph Storage 1.2
Red Hat Ceph Storage 1.2.3
Red Hat Ceph Storage 1.3
Inktank Ceph Enterprise 1.2
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7

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