[HDFS-13124] hadoop-daemon.sh exits with 1 when running HDFS balancer on balanced cluster

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 2.7.3
• Component/s: balancer & mover, scripts
• Assignee: Unassigned
• Reporter: Zbigniew Kostrzewa
• Created: 08/Feb/18 12:57
• Updated: 22/Feb/18 09:29

Description

When running HDFS balancer via sbin/start-balancer.sh script on a balanced cluster the script exits with 1 though the CLI behind it (i.e. hdfs balancer) exits with 0. This is probably caused by following piece of code found in hadoop-daemon.sh:

sleep 3;
if ! ps -p $! > /dev/null ; then
  exit 1
fi

It seems the CLI command finishes so quickly in case of a balanced cluster that the above ps does not find it.