PREIN

/bin/sh

getent group yarn >/dev/null || groupadd -r yarn
getent passwd yarn >/dev/null || /usr/sbin/useradd --comment "Apache Hadoop Yarn" --shell /sbin/nologin -M -r -g yarn -G hadoop --home /var/cache/hadoop-yarn yarn

PREUN

/bin/sh

/usr/share/rpm-helper/del-service hadoop $1 hadoop-proxyserver.service hadoop-resourcemanager.service hadoop-nodemanager.service hadoop-timelineserver.service

POSTIN

/bin/sh

/usr/share/rpm-helper/add-service hadoop $1 hadoop-proxyserver.service hadoop-resourcemanager.service hadoop-nodemanager.service hadoop-timelineserver.service 

/usr/bin/systemd-tmpfiles --create /usr/lib/tmpfiles.d/hadoop-yarn.conf

POSTUN

/bin/sh

/usr/share/rpm-helper/reread-services hadoop