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Date: Mon, 3 May 2010 15:19:56 -0400 (EDT)
From: "Travis Crawford (JIRA)" <jira@apache.org>
To: common-dev@hadoop.apache.org
Subject: [jira] Created: (HADOOP-6746) hadoop-daemon.sh does not append to
 log files
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hadoop-daemon.sh does not append to log files
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                 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 mode.

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

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