hadoop - Issue in Connecting to HDFS Namenode -



hadoop - Issue in Connecting to HDFS Namenode -

after new hadoop single node installation , got next error in hadoop-root-datanode-localhost.localdomain.log

2014-06-18 23:43:23,594 error org.apache.hadoop.security.usergroupinformation: priviledgedactionexception as:root cause:java.net.connectexception: phone call localhost/127.0.0.1:54310 failed on connection exception: java.net.connectexception: connection refused 2014-06-18 23:43:23,595 info org.apache.hadoop.mapred.jobtracker: problem connecting hdfs namenode... re-trying java.net.connectexception: phone call localhost/127.0.0.1:54310 failed on connection exception: java.net.connectexception: connection refusedat org.apache.hadoop.ipc.client.wrapexception(client.java:1142)

any idea.?

jps not giving ouput

core site.xml updated

<configuration> <property> <name>hadoop.tmp.dir</name> <value>/opt/surya/hadoop-1.2.1/tmp</value> <description>a base of operations other temporary directories.</description> </property> <property> <name>fs.default.name</name> <value>hdfs://localhost:54310</value> <description>the name of default file system. uri scheme , authorization determine filesystem implementation. uri's scheme determines config property (fs.scheme.impl) naming filesystem implementation class. uri's authorization used determine host, port, etc. filesystem.</description> </property> </configuration>

also , on format using hadoop namenode -format got below aborted error

re-format filesystem in /tmp/hadoop-root/dfs/name ? (y or n) y format aborted in /tmp/hadoop-root/dfs/name

you need run hadoop namenode -format hdfs-superuser. "hdfs" user itself.

the hint can seen here:

usergroupinformation: priviledgedactionexception as:root cause:java

another thing consider: want move hdfs root other /tmp. risk losing hdfs contents when /tmp cleaned (which happen time)

update based on op comments.

re: jobtracker unable contact namenode: please not skip steps.

first create sure format namenode then start namenode , datanodes

run basic hdfs commands such

hdfs dfs -put

and

hdfs dfs -get then can start jobtracker , tasktracker then (and not earlier) can seek run mapreduce job (which uses hdfs)

hadoop hdf

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