jojochuang opened a new pull request #1334: HBASE-8868. add metric to report client shortcircuit reads. URL: https://github.com/apache/hbase/pull/1334 Expose file system level read metrics for RegionServer. If the HBase RS runs on top of HDFS, calculate the aggregation of ReadStatistics of each HdfsFileInputStream. These metrics include: (1) total number of bytes read from HDFS. (2) total number of bytes read from local DataNode. (3) total number of bytes read locally through short-circuit read. (4) total number of bytes read locally through zero-copy read. Because HDFS ReadStatistics is calculated per input stream, it is not feasible to update the aggregated number in real time. Instead, the metrics are updated when an input stream is closed.
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