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  1. Hadoop Common
  2. HADOOP-15125 Complete integration of new StorageStatistics
  3. HADOOP-13031

Rack-aware read bytes stats should be managed by HFDS specific StorageStatistics

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    Details

    • Type: Sub-task
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: fs
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    • Target Version/s:

      Description

      HADOOP-13065 added a new interface for retrieving FS and FC Statistics. This jira is to refactor the code that maintains rack-aware read metrics to use the newly added StorageStatistics. Specially,

      1. Rack-aware read bytes metrics is mostly specific to HDFS. For example, local file system doesn't need that. We consider to move it from base FileSystemStorageStatistics to a dedicated HDFS specific StorageStatistics sub-class.
      2. We would have to develop an optimized thread-local mechanism to do this, to avoid causing a performance regression in HDFS stream performance.

      Optionally, it would be better to simply move this to HDFS's existing per-stream ReadStatistics for now. As HDFS-9579 states, ReadStatistics metrics are only accessible via DFSClient or DFSInputStream. Not something that application framework such as MR and Tez can get to.

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              • Assignee:
                liuml07 Mingliang Liu
                Reporter:
                liuml07 Mingliang Liu
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                • Created:
                  Updated: