Github user merrimanr commented on the issue:
https://github.com/apache/metron/pull/1077
@justinleet I changed the logic to reverse the operation rather than
reverting back to a copy. This means that a comment will be removed from the
list on a failed add and a comment will be added back to the list on a failed
remove. The list is sorted by timestamp after a comment is put back to
preserve the order. This should make different add/remove operations
independent of each other. Let me know what you think.
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