Chris Nauroth created HDFS-5957:
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Summary: Provide support for different mmap cache retention
policies in ShortCircuitCache.
Key: HDFS-5957
URL: https://issues.apache.org/jira/browse/HDFS-5957
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs-client
Affects Versions: 2.3.0
Reporter: Chris Nauroth
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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