Refactor JobTracker.Expire* arround an utility class
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Key: HADOOP-3609
URL: https://issues.apache.org/jira/browse/HADOOP-3609
Project: Hadoop Core
Issue Type: Improvement
Components: mapred, util
Reporter: Brice Arnould
Priority: Minor
I would like to propose a new class, called ExpiringHashSet, which could
factorize the code from JobTracker.ExpireLaunchingTasks and
JobTracker.ExpireTrackers.
It behaves like an ordinary HashSet, but adds two methods and one argument to
the constructor.
That argument, {{lifeTime}}, tells after how much milliseconds an element added
to the container expire and is removed.
The first method, {{update(element)}}, takes an element as it argument and
delay it's expiration by {{lifeTime}} milliseconds.
The last method, {{makeExpire}} is called by the ExpiringHashSet just before it
remove an old item. If that method return false, the item won't be removed.
Nothing expire while we're synchronized on the ExpiringHashSet.
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