ableegoldman commented on a change in pull request #10342:
URL: https://github.com/apache/kafka/pull/10342#discussion_r596443720



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File path: 
streams/src/main/java/org/apache/kafka/streams/processor/internals/ProcessorStateManager.java
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@@ -186,7 +186,7 @@ public ProcessorStateManager(final TaskId taskId,
         this.changelogReader = changelogReader;
         this.sourcePartitions = sourcePartitions;
 
-        this.baseDir = stateDirectory.directoryForTask(taskId);
+        this.baseDir = stateDirectory.getOrCreateDirectoryForTask(taskId);

Review comment:
       Note: the only logical changes are in `StateDirectory` and 
`KafkaStreams`, the rest of the files were just touched by renaming this method 
to include the `getOrCreate` prefix. Sorry for the expanded surface area, I 
felt the renaming was merited since otherwise this critical functionality is 
easy to miss. 
   
   There are also some non-renaming changes in StateManagerUtil and TaskManager 
that just involve removing the try-catch logic for the no longer throwable 
IOException. For tests, you should focus on `StateDirectoryTest` and 
`StateManagerUtilTest`




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