public synchronized Iterable<PipeRuntimeException> getExceptionMessages() {
    return new ArrayList<>(exceptionMessages);
  }
Stores the exceptions encountered during run time of each pipe task.

<p>The exceptions are instances of {@link PipeRuntimeCriticalException}, {@link
PipeRuntimeConnectorCriticalException} and {@link PipeRuntimeNonCriticalException}.

<p>The failure of them, respectively, will lead to the stop of the pipe, the stop of the pipes
sharing the same connector, and nothing.
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/pipe/agent/task/meta/PipeTaskMeta.java