virajjasani commented on code in PR #4924:
URL: https://github.com/apache/hbase/pull/4924#discussion_r1046590676
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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:
> The goal of the WAL extended attribute is to pass some attributes down to
the replication implementation from the coproc implementation
That is correct but coproc would add it only so that it can consume it at
sink side correct? Otherwise who else would read WAL attributes from WALEntry
at sink side? HBase does it, while preparing for sink side mutations.
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