virajjasani commented on code in PR #4924:
URL: https://github.com/apache/hbase/pull/4924#discussion_r1046586266


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hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSink.java:
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@@ -265,6 +266,11 @@ public void replicateEntries(List<WALEntry> entries, final 
CellScanner cells,
               mutation.setClusterIds(clusterIds);
               mutation.setAttribute(ReplicationUtils.REPLICATION_ATTR_NAME,
                 HConstants.EMPTY_BYTE_ARRAY);
+              if (attributeList != null) {

Review Comment:
   There has to be a consumer of WAL extended attribute. The primary purpose 
for anything associated with WALKey is meant for deriving appropriate Mutation 
behavior or replication related behavior (like list of cluster ids). Hence if 
we allow coproc to set the WAL extended attributes, we should also let the 
attributes be consumed at sink side. Otherwise we won't be able to have any 
consumer of these attributes, correct?



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