kennknowles commented on a change in pull request #13893:
URL: https://github.com/apache/beam/pull/13893#discussion_r572296662



##########
File path: 
sdks/java/harness/src/main/java/org/apache/beam/fn/harness/control/ProcessBundleHandler.java
##########
@@ -705,6 +718,17 @@ void reset() throws Exception {
         resetFunction.run();
       }
     }
+
+    void shutdown() {
+      for (ThrowingRunnable tearDownFunction : getTearDownFunctions()) {
+        LOG.debug("Tearing down function {}", tearDownFunction);
+        try {
+          tearDownFunction.run();
+        } catch (Exception e) {
+          LOG.error("Failed to call teardown function: {}", e);

Review comment:
       The document is for a user, who should not have to think about portable 
execution. The contract for which methods are called should be independent of 
portable execution. For example some runners may choose to execute some steps 
directly even if they support portability.




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