lukecwik commented on a change in pull request #12986:
URL: https://github.com/apache/beam/pull/12986#discussion_r504144683
##########
File path:
runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/StreamingDataflowWorker.java
##########
@@ -1384,6 +1374,17 @@ private void process(
Object executionKey =
keyCoder == null ? null : keyCoder.decode(key.newInput(),
Coder.Context.OUTER);
+ if (workItem.hasHotKeyInfo()) {
+ Windmill.HotKeyInfo hotKeyInfo = workItem.getHotKeyInfo();
+ Duration hotKeyAge = Duration.millis(hotKeyInfo.getHotKeyAgeUsec() /
1000);
+
+ // The MapTask instruction is ordered by dependencies, such that the
first element is
+ // always going to be the shuffle task.
+ String stepName =
computationState.getMapTask().getInstructions().get(0).getName();
+ Object hotkey = options.isHotKeyLoggingEnabled() ? executionKey : null;
+ hotKeyLogger.logHotKeyDetection(stepName, hotKeyAge, hotkey);
Review comment:
See my earlier comment on #12984 about assuming that `key == null` is
the same thing as not present.
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