asafm commented on code in PR #16758:
URL: https://github.com/apache/pulsar/pull/16758#discussion_r945692734


##########
pulsar-transaction/coordinator/src/main/java/org/apache/pulsar/transaction/coordinator/impl/TxnLogBufferedWriterMetricsStats.java:
##########
@@ -118,84 +107,71 @@ public TxnLogBufferedWriterMetricsStats(String 
metricsPrefix, String[] labelName
 
         String recordsPerBatchMetricName =
                 String.format("%s_bufferedwriter_batch_record_count", 
metricsPrefix);
-        recordsPerBatchMetric = (Histogram) COLLECTOR_CACHE.computeIfAbsent(
-                recordsPerBatchMetricName,
-                k -> new Histogram.Builder()
+        this.recordsPerBatchMetric = new Histogram.Builder()

Review Comment:
   No need for `this.`



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