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-rw-r--r--src/rabbit_mirror_queue_sync.erl6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/rabbit_mirror_queue_sync.erl b/src/rabbit_mirror_queue_sync.erl
index 3fbe03fa02..7cfd0ab4b6 100644
--- a/src/rabbit_mirror_queue_sync.erl
+++ b/src/rabbit_mirror_queue_sync.erl
@@ -346,7 +346,11 @@ slave_sync_loop(Args = {Ref, MRef, Syncer, BQ, UpdateRamDuration, Parent},
slave_sync_loop(Args, {MA1, TRef, BQS1});
{sync_msgs, Ref, Batch} ->
credit_flow:ack(Syncer),
- %% we don't need to reverse BatchP1 and BatchPD1 since the
+ %% We need to partition the batch in messages that need to
+ %% be batch_publish/2 and the ones that need to be
+ %% batch_publish_delivered/2.
+ %%
+ %% We don't need to reverse BatchP1 and BatchPD1 since the
%% foldl takes care of that.
{BatchP1, BatchPD1} =
lists:foldl(