[HADOOP-8092] Hadoop DataNode cannot start up in Pseudo-Distributed mode using start-all.sh if it is run as root

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 0.20.203.0
• Component/s: scripts

Environment

Centos 5.6, Java 1.6 (Sun JDK)

1. java -version
   java version "1.6.0_31"
   Java(TM) SE Runtime Environment (build 1.6.0_31-b04)
   Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01, mixed mode)

1. uname -a
   Linux server-56164 2.6.18-238.19.1.el5 #1 SMP Fri Jul 15 07:31:24 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux

Pseudo-Distributed mode

• Assignee: Unassigned
• Reporter: Istvan Szegedi
• Created: 18/Feb/12 16:51
• Updated: 08/Aug/14 22:21
• Resolved: 08/Aug/14 22:21

Description

Hadoop DataNode cannot start-up if you run start-all.sh (or start-dfs.sh) as root.

There is a HADOOP_OPTS setting in bin/hadoop file in case EUID equals 0 :

...
elif [ "$COMMAND" = "datanode" ] ; then
CLASS='org.apache.hadoop.hdfs.server.datanode.DataNode'
if [[ $EUID -eq 0 ]]; then
HADOOP_OPTS="$HADOOP_OPTS -jvm server $HADOOP_DATANODE_OPTS"
else
HADOOP_OPTS="$HADOOP_OPTS -server $HADOOP_DATANODE_OPTS"
fi
elif ...

Since -jvm is not a recognized option by Sun HotSpot Java JVM (64-bit), an error message is generated:

Unrecognized option: -jvm
Could not create the Java virtual machine.

If you replace -jvm server option with -server, DataNode will start up.

Issue Links

• is related to: HADOOP-9902 Shell script rewrite