Examples of errors detected by the V6074 diagnostic

V6074. Non-atomic modification of volatile variable.

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V6074 Non-atomic modification of volatile variable. Inspect 'currentNumAcknowledgedSubtasks'. PendingCheckpointStats.java(131)

boolean reportSubtaskStats(JobVertexID jobVertexId, SubtaskStateStats subtask) {
  TaskStateStats taskStateStats = taskStats.get(jobVertexId);

  if (taskStateStats != null && taskStateStats.reportSubtaskStats(subtask)) {
    currentNumAcknowledgedSubtasks++;                // <=
    latestAcknowledgedSubtask = subtask;

    currentStateSize += subtask.getStateSize();      // <=

    long processedData = subtask.getProcessedData();
    if (processedData > 0) {
      currentProcessedData += processedData;         // <=
    }

    long persistedData = subtask.getPersistedData();
    if (persistedData > 0) {
      currentPersistedData += persistedData;         // <=
    }
    return true;
  } else {
    return false;
  }
}

Similar errors can be found in some other places:

• V6074 Non-atomic modification of volatile variable. Inspect 'currentStateSize'. PendingCheckpointStats.java(134)
• V6074 Non-atomic modification of volatile variable. Inspect 'currentProcessedData'. PendingCheckpointStats.java(138)
• V6074 Non-atomic modification of volatile variable. Inspect 'currentPersistedData'. PendingCheckpointStats.java(143)