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MapReduce >> mail # user >> Restarting a cluster


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Restarting a cluster
We have a cluster with 4 Cloudera VMs -

 hadoop fs -ls /
says
10/07/12 05:42:22 INFO ipc.Client: Retrying connect to server: localhost/
127.0.0.1:8022. Already tried 0 time(s).
10/07/12 05:42:23 INFO ipc.Client: Retrying connect to server: localhost/
127.0.0.1:8022. Already tried 1 time(s).

on one box

1) How do I restart
2) I edited /ect/hadoop/conf/hdfs-site.xml to add a second drive to hdfs

  <property>
     <!-- specify this so that running 'hadoop namenode -format' formats the
right dir -->
     <name>dfs.name.dir</name>
     <value>/var/lib/hadoop-0.20/cache/hadoop/dfs/name*,/local*</value>
  </property>

What other steps are needed - i.e do I need to format the space, restart
hadoop, restart the cluster ???

--
Steven M. Lewis PhD
Institute for Systems Biology
Seattle WA
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB