VicoWu opened a new pull request, #6922:
URL: https://github.com/apache/hadoop/pull/6922
the -Dhadoop.root.logger will use the value of `HADOOP_ROOT_LOGGER`.
In most cases, hadoop administrator tends to setup HADOOP_ROOT_LOGGER
directly, it is effective in non-daemon mode and most hadoop administrator are
not even aware of the existense of `HADOOP_DAEMON_ROOT_LOGGER`.
So when he started up HADOOP as daemon mode, no matter how he set up
`HADOOP_ROOT_LOGGER`, the `-Dhadoop.root.logger` is not changed because in
Daemon mode, the `HADOOP_ROOT_LOGGER` is set up by `HADOOP_DAEMON_ROOT_LOGGER`
which is in fact a default value. The code is as below:
```shell
if [[ "${HADOOP_DAEMON_MODE}" != "default" ]]; then
if [[ "${HADOOP_DAEMON_ROOT_LOGGER}" !=
"${HADOOP_DAEMON_ROOT_LOGGER_DEFAULT}" ]]; then
HADOOP_ROOT_LOGGER="${HADOOP_DAEMON_ROOT_LOGGER}"
fi
if [[ "${HADOOP_SUBCMD_SECURESERVICE}" = true ]]; then
HADOOP_LOGFILE="hadoop-${HADOOP_SECURE_USER}-${HADOOP_IDENT_STRING}-${HADOOP_SUBCMD}-${HOSTNAME}.log"
else
HADOOP_LOGFILE="hadoop-${HADOOP_IDENT_STRING}-${HADOOP_SUBCMD}-${HOSTNAME}.log"
fi
fi
```
But in DAEMON mode, the HADOOP_ROOT_LOGGER is ignored and the
HADOOP_DAEMON_ROOT_LOGGER is set to HADOOP_ROOT_LOGGER.
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