MessageRouterUtils > MessageGroupBatch.toShortDebugString() > Do not coalesce identical message-IDs #240
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This could help to avoid confusion during debugging when a batch/group of messages with identical IDs is received and we're checking message count or for duplicate message IDs e.g.:
I've had a case where I received message group with 2 messages with the same ID, message router log would show that the there's only 1 message in group but my "group message count == 1" check would fail and I couldn't understand why.