[jira] [Created] (HADOOP-9873) hadoop-env.sh got called multiple times

["Kai Zheng (JIRA)" <ji...@apache.org>]

Kai Zheng created HADOOP-9873:
---------------------------------

             Summary: hadoop-env.sh got called multiple times
                 Key: HADOOP-9873
                 URL: https://issues.apache.org/jira/browse/HADOOP-9873
             Project: Hadoop Common
          Issue Type: Bug
          Components: scripts
            Reporter: Kai Zheng
            Assignee: Kai Zheng
            Priority: Minor


Ref. below, it can be seen hadoop-env.sh got called multiple times when running something like 'hadoop-daemon.sh start namenode'.
{noformat}
[drankye@zkdev ~]$ cd $HADOOP_PREFIX
[drankye@zkdev hadoop-3.0.0-SNAPSHOT]$ grep -r hadoop-env *
libexec/hadoop-config.sh:if [ -e "${HADOOP_PREFIX}/conf/hadoop-env.sh" ]; then
libexec/hadoop-config.sh:if [ -f "${HADOOP_CONF_DIR}/hadoop-env.sh" ]; then
libexec/hadoop-config.sh:  . "${HADOOP_CONF_DIR}/hadoop-env.sh"
sbin/hadoop-daemon.sh:if [ -f "${HADOOP_CONF_DIR}/hadoop-env.sh" ]; then
sbin/hadoop-daemon.sh:  . "${HADOOP_CONF_DIR}/hadoop-env.sh"
{noformat}

Considering the following lines in hadoop-env.sh
{code}
# Command specific options appended to HADOOP_OPTS when specified
export HADOOP_NAMENODE_OPTS="-Dhadoop.security.logger=${HADOOP_SECURITY_LOGGER:-INFO,RFAS} -Dhdfs.audit.logger=${HDFS_AUDIT_LOGGER:-INFO,NullAppender} $HADOOP_NAMENODE_OPTS"
{code}
It may end with some redundant result like below when called multiple times.
{noformat}
HADOOP_NAMENODE_OPTS='-Dhadoop.security.logger=INFO,RFAS -Dhdfs.audit.logger=INFO,NullAppender -Dhadoop.security.logger=INFO,RFAS -Dhdfs.audit.logger=INFO,NullAppender '
{noformat}

It's not a big issue for now however it would be better to be clean and avoid this since it can cause the final JAVA command line is very lengthy and hard to read.

A possible fix would be to add a flag variable like HADOOP_ENV_INITED in hadoop-env.sh, and then at the beginning of it check the flag. If the flag evaluates true, then return immediately.

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