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    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at org.apache.hadoop.hdfs.server.namenode.BlockPlacementPolicy.getInstance()
    2. Apache Hadoop HDFS
      1. org.apache.hadoop.hdfs.server.namenode.BlockPlacementPolicy.getInstance(
      2. org.apache.hadoop.hdfs.server.balancer.Balancer.checkReplicationPolicyCompatibility(
      2 frames