yashmayya commented on code in PR #13801:
URL: https://github.com/apache/kafka/pull/13801#discussion_r1259168414


##########
connect/runtime/src/main/java/org/apache/kafka/connect/storage/ConnectorOffsetBackingStore.java:
##########
@@ -279,8 +284,51 @@ public Future<Void> set(Map<ByteBuffer, ByteBuffer> 
values, Callback<Void> callb
             throw new IllegalStateException("At least one non-null offset 
store must be provided");
         }
 
+        boolean containsTombstones = values.containsValue(null);
+
+        // If there are tombstone offsets, then the failure to write to 
secondary store will
+        // not be ignored. Also, for tombstone records, we first write to 
secondary store and
+        // then to primary stores.
+        if (secondaryStore != null && containsTombstones) {
+            AtomicReference<Throwable> secondaryStoreTombstoneWriteError = new 
AtomicReference<>();
+            FutureCallback<Void> secondaryWriteFuture = new FutureCallback<>();
+            secondaryStore.set(values, secondaryWriteFuture);
+            try {
+                // For EOS, there is no timeout for offset commit and it is 
allowed to take as much time as needed for
+                // commits. We still need to wait because we want to fail the 
offset commit for cases when

Review Comment:
   > Well the rationale it the same that EOS waits indefinitely for the commits 
to happen
   
   Prior to this change, we just waited for the producer transaction commit to 
complete since we didn't care about the writes to the secondary store (and the 
transaction would contain all the data records as well as offset records 
written to the connector's primary store). However, that would be bounded by 
the producer's `transaction.timeout.ms` right?



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