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https://issues.apache.org/jira/browse/HADOOP-13031?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mingliang Liu updated HADOOP-13031:
-----------------------------------
Issue Type: Sub-task (was: Improvement)
Parent: HADOOP-13065
> 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: Sub-task
> Reporter: Mingliang Liu
>
> 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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