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  1. Hadoop HDFS
  2. HDFS-17208

Add the metrics PendingAsyncDiskOperations in datanode

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      Consider should add the metrics `PendingAsyncDiskOperations` to be able to track if we are queueing too many asynchronous disk operations in FsDatasetAsyncDiskService of the datanode.

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            haiyang Hu Haiyang Hu Assign to me
            haiyang Hu Haiyang Hu
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