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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