hadoop-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Ivan Ryndin <iryn...@gmail.com>
Subject Is it necessary to run secondary namenode when starting HDFS?
Date Mon, 17 Dec 2012 17:04:49 GMT
Hi all,

is it necessary to run secondary namenode when starting HDFS?
I am dealing with Hadoop 1.1.1.
Looking at script $HADOOP_HOME/bin/start_dfs.sh
There are next lines in this file:

# start dfs daemons
# start namenode after datanodes, to minimize time namenode is up w/o data
# note: datanodes will log connection errors until namenode starts
"$bin"/hadoop-daemon.sh --config $HADOOP_CONF_DIR start namenode
$nameStartOpt
"$bin"/hadoop-daemons.sh --config $HADOOP_CONF_DIR start datanode
$dataStartOpt
"$bin"/hadoop-daemons.sh --config $HADOOP_CONF_DIR --hosts masters start
secondarynamenode

 So, will HDFS work if I turn off starting of secondarynamenode ?

I do ask this because I am playing with Hadoop on two-node cluster only
(and machines in cluster do not have much RAM and disk space), and thus
don't want to run unnecessary processes.

-- 
Best regards,
Ivan P. Ryndin,

Mime
View raw message