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https://issues.apache.org/jira/browse/BIGTOP-1038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13741806#comment-13741806
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Masatake Iwasaki commented on BIGTOP-1038:
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The motivation for this issue is avoiding misconfiguration of users upgraded
from previous versions who is tending to set HADOOP_IDENT_STRING in
hadoop-env.sh. Though the users of packaged Hadoop should not override
HADOOP_IDENT_STRING, I think there is no good way to keep user from overriding
it. Maybe providing hadoop-env.sh which includes "do not override" comment as a
part of package is going be some help. Currently *-env.sh is only provided for
security settings.
> PIDFILE in service scripts of Hadoop is inconsistent with the path in
> hadoop-daemon.sh
> --------------------------------------------------------------------------------------
>
> Key: BIGTOP-1038
> URL: https://issues.apache.org/jira/browse/BIGTOP-1038
> Project: Bigtop
> Issue Type: Bug
> Components: Init scripts
> Affects Versions: 0.6.0
> Reporter: Masatake Iwasaki
> Assignee: Masatake Iwasaki
>
> PIDFILE in service scripts is fixed value because of variable expansion
> during packaging.
> {noformat}
> $ grep 'PIDFILE=' /etc/init.d/hadoop-*
> /etc/init.d/hadoop-hdfs-datanode:PIDFILE="/var/run/hadoop-hdfs/hadoop-hdfs-datanode.pid"
> /etc/init.d/hadoop-hdfs-namenode:PIDFILE="/var/run/hadoop-hdfs/hadoop-hdfs-namenode.pid"
> /etc/init.d/hadoop-mapreduce-historyserver:PIDFILE="/var/run/hadoop-mapreduce/mapred-mapred-historyserver.pid"
> /etc/init.d/hadoop-yarn-nodemanager:PIDFILE="/var/run/hadoop-yarn/yarn-yarn-nodemanager.pid"
> /etc/init.d/hadoop-yarn-resourcemanager:PIDFILE="/var/run/hadoop-yarn/yarn-yarn-resourcemanager.pid"
> {noformat}
> However, HADOOP_IDENT_STRING composing pidfile path is configurable in
> hadoop-env.sh.
> {noformat}
> $ grep HADOOP_IDENT_STRING /usr/lib/hadoop/sbin/hadoop-daemon.sh
> # HADOOP_IDENT_STRING A string representing this instance of hadoop.
> $USER by default
> export HADOOP_IDENT_STRING=$HADOOP_SECURE_DN_USER
> if [ "$HADOOP_IDENT_STRING" = "" ]; then
> export HADOOP_IDENT_STRING="$USER"
> chown $HADOOP_IDENT_STRING $HADOOP_LOG_DIR
> export HADOOP_LOGFILE=hadoop-$HADOOP_IDENT_STRING-$command-$HOSTNAME.log
> log=$HADOOP_LOG_DIR/hadoop-$HADOOP_IDENT_STRING-$command-$HOSTNAME.out
> pid=$HADOOP_PID_DIR/hadoop-$HADOOP_IDENT_STRING-$command.pid
> {noformat}
> As a result, the path of pidfile matches only when HADOOP_IDENT_STRING is
> service user name which is the default.
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