Use RollingFileAppender to limit tasklogs
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Key: MAPREDUCE-1648
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1648
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: tasktracker
Reporter: Guilin Sun
Priority: Minor
There are at least two types of task-logs: syslog and stdlog
Task-Jvm outputs syslog by log4j with TaskLogAppender, TaskLogAppender looks
just like "tail -c", it stores last N byte/line logs in memory(via queue), and
do real output only if all logs is commit and Appender is going to close.
The common problem of TaskLogAppender and 'tail -c' is keep everything in
memory and user can't see any log output while task is in progress.
So I'm going to try RollingFileAppender instead of TaskLogAppender, use
MaxFileSize&MaxBackupIndex to limit log file size.
RollingFileAppender is also suitable for stdout/stderr, just redirect
stdout/stderr to log4j via LoggingOutputStream, no client code have to be
changed, and RollingFileAppender seems better than 'tail -c' too.
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