Bernd Mathiske created MESOS-3112:
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Summary: Fetcher should perform cache eviction based on cache file
usage patterns.
Key: MESOS-3112
URL: https://issues.apache.org/jira/browse/MESOS-3112
Project: Mesos
Issue Type: Improvement
Components: fetcher
Reporter: Bernd Mathiske
Assignee: Jan Schlicht
Priority: Minor
Currently, the fetcher uses a trivial strategy to select eviction victims: it
picks the first cache file it finds in linear iteration. This means that
potentially a file that has just been used gets evicted the next moment. This
performance loss can be avoided by even the simplest enhancement of the
selection procedure.
Proposed approach: determine an effective yet relatively uncomplex and quick
algorithm and implement it in `FetcherProcess::Cache::selectVictims(const
Bytes& requiredSpace)`. Suggestion: approximate MRU-retention somehow.
Unit-test what actually happens!
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