FAQ
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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postedMay 3, '10 at 7:20p
activeMay 3, '10 at 7:20p
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Travis Crawford (JIRA): 1 post

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