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From "John Vines (JIRA)" <>
Subject [jira] [Updated] (ACCUMULO-2419) Improve SimpleTimer by replacing java.util.Timer
Date Fri, 04 Apr 2014 17:18:15 GMT


John Vines updated ACCUMULO-2419:

    Fix Version/s: 1.7.0

> Improve SimpleTimer by replacing java.util.Timer
> ------------------------------------------------
>                 Key: ACCUMULO-2419
>                 URL:
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: tserver
>            Reporter: Bill Havanki
>            Assignee: Bill Havanki
>            Priority: Minor
>              Labels: performance
>             Fix For: 1.7.0
> The server utility class {{SimpleTimer}} uses a {{java.util.Timer}} under the hood for
scheduling tasks. From _Java Concurrency in Practice_, p. 123:
> bq. {{Timer}} has some drawbacks, and {{ScheduledThreadPoolExecutor}} should be thought
of as its replacement. ... there is little reason to use {{Timer}} in Java 5.0 or later.
> The purpose of {{SimpleTimer}} is "to reduce the number of threads dedicated to simple
events", but a user cannot opt to let more than one thread handle the events on systems that
can take the load. Also, if any task does take a long time for some reason, execution of other
tasks is affected.
> The {{Timer}} in {{SimpleTimer}} should be replaced with {{ScheduledThreadPoolExecutor}},
and the class should allow for more than one thread to be used for task execution.

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