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  1. Hadoop HDFS
  2. HDFS-17555

Fix NumberFormatException of NNThroughputBenchmark when configured dfs.blocksize.

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           when using NNThroughputBenchmark, the configuration item dfs.blocksize in hdfs-site.xml is configured with a letter as the suffix,such as 256m,NumberFormatException occurred.
      command:
      hadoop org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark -fs hdfs://xxxxx -op create -threads 100 -files 10000 -filesPerDir 100 -close

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