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  1. Hadoop HDFS
  2. HDFS-1368

Add a block counter to DatanodeDescriptor

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.22.0
    • Component/s: namenode
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      Many of time, we need to count the total number of blocks in a datanode by calling DatanodeDescriptor#numBlocks(). It has to traverse the block list to get the counter, which may not be trivial if there are millions of blocks. Adding a counter for each datanode does not cost much space but help save CPU processing time.

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            • Assignee:
              hairong Hairong Kuang
              Reporter:
              hairong Hairong Kuang
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              • Created:
                Updated:
                Resolved: