heesung-sn commented on code in PR #20948:
URL: https://github.com/apache/pulsar/pull/20948#discussion_r1305063620


##########
pulsar-client/src/main/java/org/apache/pulsar/client/impl/ConsumerImpl.java:
##########
@@ -1449,6 +1450,24 @@ private ByteBuf processMessageChunk(ByteBuf 
compressedPayload, MessageMetadata m
         // discard message if chunk is out-of-order
         if (chunkedMsgCtx == null || chunkedMsgCtx.chunkedMsgBuffer == null
                 || msgMetadata.getChunkId() != 
(chunkedMsgCtx.lastChunkedMessageId + 1)) {
+            // Filter duplicated chunks instead of discard it. (Only do this 
when exist duplication in a chunk message)
+            // For example:
+            //     Chunk-1 sequence ID: 0, chunk ID: 0
+            //     Chunk-2 sequence ID: 0, chunk ID: 0
+            //     Chunk-3 sequence ID: 0, chunk ID: 1
+            if (chunkedMsgCtx != null && msgMetadata.getChunkId() <= 
chunkedMsgCtx.lastChunkedMessageId) {
+                log.warn("[{}] Receive a repeated chunk messageId {}, 
last-chunk-id{}, chunkId = {}",
+                        msgMetadata.getProducerName(), 
chunkedMsgCtx.lastChunkedMessageId, msgId, msgMetadata.getChunkId());
+                compressedPayload.release();
+                increaseAvailablePermits(cnx);
+                boolean repeatedlyReceived = 
Arrays.stream(chunkedMsgCtx.chunkedMessageIds)
+                        .anyMatch(messageId1 -> messageId1 != null && 
messageId1.ledgerId == messageId.getLedgerId()

Review Comment:
   Again, do we need to check all chunkedMessageIds? Can't we check the last 
one? `chunkedMsgCtx.chunkedMessageIds[lastChunkedMessageId]`?



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