client-spark/spark-3/src/main/java/org/apache/spark/shuffle/celeborn/SparkShuffleManager.java [234:262]:
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      ShuffleHandle handle,
      int startMapIndex,
      int endMapIndex,
      int startPartition,
      int endPartition,
      TaskContext context,
      ShuffleReadMetricsReporter metrics) {
    if (handle instanceof CelebornShuffleHandle) {
      @SuppressWarnings("unchecked")
      CelebornShuffleHandle<K, ?, C> h = (CelebornShuffleHandle<K, ?, C>) handle;
      return new CelebornShuffleReader<>(
          h,
          startPartition,
          endPartition,
          startMapIndex,
          endMapIndex,
          context,
          celebornConf,
          metrics);
    }
    return SparkUtils.getReader(
        sortShuffleManager(),
        handle,
        startMapIndex,
        endMapIndex,
        startPartition,
        endPartition,
        context,
        metrics);
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client-spark/spark-3/src/main/java/org/apache/spark/shuffle/celeborn/SparkShuffleManager.java [291:319]:
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      ShuffleHandle handle,
      int startMapIndex,
      int endMapIndex,
      int startPartition,
      int endPartition,
      TaskContext context,
      ShuffleReadMetricsReporter metrics) {
    if (handle instanceof CelebornShuffleHandle) {
      @SuppressWarnings("unchecked")
      CelebornShuffleHandle<K, ?, C> h = (CelebornShuffleHandle<K, ?, C>) handle;
      return new CelebornShuffleReader<>(
          h,
          startPartition,
          endPartition,
          startMapIndex,
          endMapIndex,
          context,
          celebornConf,
          metrics);
    }
    return SparkUtils.getReader(
        sortShuffleManager(),
        handle,
        startMapIndex,
        endMapIndex,
        startPartition,
        endPartition,
        context,
        metrics);
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