client-spark/spark-2/src/main/java/org/apache/spark/shuffle/celeborn/SparkShuffleManager.java [238:249]:
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  private int executorCores(SparkConf conf) {
    if (Utils.isLocalMaster(conf)) {
      // SparkContext.numDriverCores is package private.
      return DynMethods.builder("numDriverCores")
          .impl("org.apache.spark.SparkContext$", String.class)
          .build()
          .bind(SparkContext$.MODULE$)
          .invoke(conf.get("spark.master"));
    } else {
      return conf.getInt(SparkLauncher.EXECUTOR_CORES, 1);
    }
  }
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client-spark/spark-3/src/main/java/org/apache/spark/shuffle/celeborn/SparkShuffleManager.java [328:339]:
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  private int executorCores(SparkConf conf) {
    if (Utils.isLocalMaster(conf)) {
      // SparkContext.numDriverCores is package private.
      return DynMethods.builder("numDriverCores")
          .impl("org.apache.spark.SparkContext$", String.class)
          .build()
          .bind(SparkContext$.MODULE$)
          .invoke(conf.get("spark.master"));
    } else {
      return conf.getInt(SparkLauncher.EXECUTOR_CORES, 1);
    }
  }
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