FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask

hive启动后，出现以下异常
 
hive> show databases;
FAILED: Error in metadata: MetaException(message:Got exception: java.net.ConnectException Call to centos7-/192.168.146.135: failed on connection exception: java.net.ConnectException: Connection refused)
FAILED: Execution Error, return code  from org.apache.hadoop.hive.ql.exec.DDLTask

原因是hadoop集群没有启动（注意端口号9000）

[root@centos7- conf]# start-all.sh //启动hadoop
starting namenode, logging to /opt/sw/hadoop-0.20./bin/../logs/hadoop-root-namenode-centos7-.out
centos7-: starting datanode, logging to /opt/sw/hadoop-0.20./bin/../logs/hadoop-root-datanode-centos7-.out
centos7-: starting datanode, logging to /opt/sw/hadoop-0.20./bin/../logs/hadoop-root-datanode-centos7-.out
centos7-: starting secondarynamenode, logging to /opt/sw/hadoop-0.20./bin/../logs/hadoop-root-secondarynamenode-centos7-.out
starting jobtracker, logging to /opt/sw/hadoop-0.20./bin/../logs/hadoop-root-jobtracker-centos7-.out
centos7-: starting tasktracker, logging to /opt/sw/hadoop-0.20./bin/../logs/hadoop-root-tasktracker-centos7-.out
centos7-: starting tasktracker, logging to /opt/sw/hadoop-0.20./bin/../logs/hadoop-root-tasktracker-centos7-.out
[root@centos7- conf]# jps
 NameNode
 SecondaryNameNode
 JobTracker
 Jps
 RunJar

就没问题了
hive> show databases;
OK
default
Time taken: 1.104 seconds