PatrickRen commented on code in PR #19473:
URL: https://github.com/apache/flink/pull/19473#discussion_r913448420


##########
flink-connectors/flink-connector-pulsar/src/main/java/org/apache/flink/connector/pulsar/sink/PulsarSinkOptions.java:
##########
@@ -128,6 +127,16 @@ private PulsarSinkOptions() {
                             "The allowed transaction recommit times if we meet 
some retryable exception."
                                     + " This is used in Pulsar Transaction.");
 
+    public static final ConfigOption<Integer> 
PULSAR_MAX_PENDING_MESSAGES_ON_PARALLELISM =
+            ConfigOptions.key(SINK_CONFIG_PREFIX + "maxPendingMessages")
+                    .intType()
+                    .defaultValue(1000)
+                    .withDescription(
+                            Description.builder()
+                                    .text(
+                                            "The maximum number of pending 
messages in on sink parallelism.")

Review Comment:
   "in **one** sink parallelism" I guess?



##########
docs/layouts/shortcodes/generated/pulsar_sink_configuration.html:
##########
@@ -20,6 +20,12 @@
             <td>Boolean</td>
             <td>If you enable this option and use 
PulsarSerializationSchema.pulsarSchema(), we would consume and deserialize the 
message by using Pulsar's <code class="highlighter-rouge">Schema</code>.</td>
         </tr>
+        <tr>
+            <td><h5>pulsar.sink.maxPendingMessages</h5></td>
+            <td style="word-wrap: break-word;">1000</td>
+            <td>Integer</td>
+            <td>The maximum number of pending messages in on sink 
parallelism.</td>

Review Comment:
   Here also "in **one** sink parallelism" I think



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