Github user roshannaik commented on a diff in the pull request: https://github.com/apache/storm/pull/2241#discussion_r129447781 --- Diff: storm-client/src/jvm/org/apache/storm/daemon/Task.java --- @@ -122,28 +130,33 @@ public Task(Executor executor, Integer taskId) throws IOException { return new ArrayList<>(0); } + public List<Integer> getOutgoingTasks(String stream, List<Object> values) { if (debug) { LOG.info("Emitting Tuple: taskId={} componentId={} stream={} values={}", taskId, componentId, stream, values); } - List<Integer> outTasks = new ArrayList<>(); - if (!streamComponentToGrouper.containsKey(stream)) { - throw new IllegalArgumentException("Unknown stream ID: " + stream); - } - if (null != streamComponentToGrouper.get(stream)) { - // null value for __system - for (LoadAwareCustomStreamGrouping grouper : streamComponentToGrouper.get(stream).values()) { + ArrayList<Integer> outTasks = new ArrayList<>(); + + // TODO: PERF: expensive hashtable lookup in critical path --- End diff -- Yes hashmap lookups showed up as an important throughput bottleneck during profiling. Had to spend a bunch of time eliminating hashmap usage in critical path. a few still remain unfortunately.
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