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  1. Hadoop HDFS
  2. HDFS-5957

Provide support for different mmap cache retention policies in ShortCircuitCache.

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Details

    • Improvement
    • Status: Resolved
    • Major
    • Resolution: Done
    • 2.3.0
    • None
    • hdfs-client
    • None

    Description

      Currently, the ShortCircuitCache retains mmap regions for reuse by multiple reads of the same block or by multiple threads. The eventual munmap executes on a background thread after an expiration period. Some client usage patterns would prefer strict bounds on this cache and deterministic cleanup by calling munmap. This issue proposes additional support for different caching policies that better fit these usage patterns.

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          is related to

          Improvement - An improvement or enhancement to an existing feature or task. YARN-1747 Better physical memory monitoring for containers

          • Major - Major loss of function.
          • Open
          relates to

          Bug - A problem which impairs or prevents the functions of the product. HIVE-6347 ZeroCopy read path for ORC RecordReader

          • Major - Major loss of function.
          • Resolved

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              Unassigned Unassigned
              cnauroth Chris Nauroth
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              Dates

                Created:
                Updated:
                Resolved: