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From "Travis Crawford (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6746) hadoop-daemon.sh does not append to log files
Date Mon, 03 May 2010 19:19:55 GMT
hadoop-daemon.sh does not append to log files

                 Key: HADOOP-6746
                 URL: https://issues.apache.org/jira/browse/HADOOP-6746
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Travis Crawford

Looking in hadoop-daemon.sh we see the start command redirects logs to the log file by creating
a new file. It does not append to the log.

nohup nice -n $HADOOP_NICENESS "$HADOOP_HOME"/bin/hadoop --config $HADOOP_CONF_DIR $command
"$@" > "$log" 2>&1 < /dev/null &

I believe output should be appended to the log file so logrotate copytruncate works. Currently
a large log file cannot be truncated without restarting the running service, which causes
issues in production environments.

The improved line would be exactly the same, except use >> to open the log file in append

nohup nice -n $HADOOP_NICENESS "$HADOOP_HOME"/bin/hadoop --config $HADOOP_CONF_DIR $command
"$@" >> "$log" 2>&1 < /dev/null &

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