[jira] [Created] (HADOOP-13031) Refactor the code that maintains rack-aware counters in FileSystem$Statistics

["Mingliang Liu (JIRA)" <ji...@apache.org>]

Mingliang Liu created HADOOP-13031:
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             Summary: Refactor the code that maintains rack-aware counters in FileSystem$Statistics
                 Key: HADOOP-13031
                 URL: https://issues.apache.org/jira/browse/HADOOP-13031
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Mingliang Liu
            Priority: Minor


According to discussion in [HDFS-10175], using a composite (e.g. enum map, array) data structure to manage the distance->bytesRead mapping will probably make the code simpler.

# {{StatisticsData}} will be a bit shorter by delegating the operations to the composite data structure.
# The {{incrementBytesReadByDistance(int distance, long newBytes)}} and {{getBytesReadByDistance(int distance)}} which switch-case all hard-code variables, may be simplified as we can set/get the {{bytesRead}} by distance directly from map/array.

This jira is to track the discussion and effort of refactoring the code that maintains rack-aware counters.



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