Abacn commented on code in PR #28122:
URL: https://github.com/apache/beam/pull/28122#discussion_r1304869938


##########
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigtable/BigtableServiceFactory.java:
##########
@@ -105,8 +104,12 @@ BigtableServiceEntry getServiceForReading(
       BigtableServiceEntry entry = entries.get(configId.id());
       if (entry != null) {
         // When entry is not null, refCount.get(configId.id()) should always 
exist.
-        // Do a getOrDefault to avoid unexpected NPEs.
-        refCounts.getOrDefault(configId.id(), new 
AtomicInteger(0)).getAndIncrement();
+        // Doing a putIfAbsent to avoid NPE.
+        AtomicInteger count = refCounts.putIfAbsent(configId.id(), new 
AtomicInteger(0));

Review Comment:
   this will definitely fix symptom. Though I cannot see if it could cause any 
potential connection leak. Let's see if @bvolpato 's opinion.



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