Periodically flush buffered file output #445
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This PR changes the FileWatchDog thread into a generic periodic task execution thread so that buffered output can be used more often.
The current FileAppender option
BufferedIOsignificantly reduces logging overhead, but is not often used because the most recent log entries need to be accessable. This change delivers both the overhead reduction provided byBufferedIO=trueand access to recent log entries.The new FileAppender option
BufferedSeconds(default value 5) provides user configuration control for this new behaviour.