tjiuming commented on code in PR #17072:
URL: https://github.com/apache/pulsar/pull/17072#discussion_r1002908398


##########
pulsar-broker/src/test/java/org/apache/pulsar/broker/stats/MetadataStoreStatsTest.java:
##########
@@ -137,4 +137,108 @@ public void testMetadataStoreStats() throws Exception {
         }
     }
 
+    @Test
+    public void testBatchMetadataStoreMetrics() throws Exception {
+        String ns = "prop/ns-abc1";
+        admin.namespaces().createNamespace(ns);
+
+        String topic = "persistent://prop/ns-abc1/metadata-store-" + 
UUID.randomUUID();
+        String subName = "my-sub1";
+
+        @Cleanup
+        Producer<String> producer = pulsarClient.newProducer(Schema.STRING)
+                .topic(topic).create();
+        @Cleanup
+        Consumer<String> consumer = pulsarClient.newConsumer(Schema.STRING)
+                .topic(topic).subscriptionName(subName).subscribe();
+
+        for (int i = 0; i < 100; i++) {
+            producer.newMessage().value(UUID.randomUUID().toString()).send();
+        }
+
+        for (;;) {
+            Message<String> message = consumer.receive(10, TimeUnit.SECONDS);
+            if (message == null) {
+                break;
+            }
+            consumer.acknowledge(message);
+        }
+
+        ByteArrayOutputStream output = new ByteArrayOutputStream();
+        PrometheusMetricsGenerator.generate(pulsar, false, false, false, 
false, output);
+        String metricsStr = output.toString();
+        Multimap<String, PrometheusMetricsTest.Metric> metricsMap = 
PrometheusMetricsTest.parseMetrics(metricsStr);
+
+        Collection<PrometheusMetricsTest.Metric> opsOverflow = 
metricsMap.get("pulsar_batch_metadata_store_overflow_ops" + "_total");
+        Collection<PrometheusMetricsTest.Metric> queueingOps = 
metricsMap.get("pulsar_batch_metadata_store_queueing_ops");
+        Collection<PrometheusMetricsTest.Metric> executorQueueSize = 
metricsMap.get("pulsar_batch_metadata_store_executor_queue_size");
+        Collection<PrometheusMetricsTest.Metric> opsWaiting = 
metricsMap.get("pulsar_batch_metadata_store_waiting_ms" + "_sum");
+
+        Assert.assertTrue(opsOverflow.size() > 0 && opsOverflow.size() % 2 == 
0);
+        Assert.assertTrue(queueingOps.size() > 0 && queueingOps.size() % 2 == 
0);
+        Assert.assertTrue(executorQueueSize.size() > 1);
+        Assert.assertTrue(opsWaiting.size() > 1);
+
+        int readOpsOverflow = 0;
+        int writeOpsOverflow = 0;
+        for (PrometheusMetricsTest.Metric m : opsOverflow) {
+            Assert.assertEquals(m.tags.get("cluster"), "test");
+            String metadataStoreName = m.tags.get("name");
+            Assert.assertNotNull(metadataStoreName);
+            
Assert.assertTrue(metadataStoreName.equals(MetadataStoreConfig.METADATA_STORE)
+                    || 
metadataStoreName.equals(MetadataStoreConfig.CONFIGURATION_METADATA_STORE)
+                    || 
metadataStoreName.equals(MetadataStoreConfig.STATE_METADATA_STORE));
+            String opType = m.tags.get("type");
+            Assert.assertNotNull(opType);
+            if (opType.equals("read")) {
+                readOpsOverflow++;
+            } else if (opType.equals("write")){
+                writeOpsOverflow++;
+            }
+            Assert.assertTrue(m.value >= 0);
+        }
+        Assert.assertEquals(readOpsOverflow, writeOpsOverflow);
+        Assert.assertTrue(readOpsOverflow > 0);

Review Comment:
   No, I didn't, just verify the outputs metrics is correct. Only verify the 
`pulsar_batch_metadata_store_overflow_ops` with different label value(`type = 
read` and `type = write`) has same quantity and greater than 0 here.



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