关于如何解决此hadoop错误有很多想法
15/04/17 10:59:57 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 0 time(s).
但是，我尝试了所有操作，但仍然看到该错误！这是我的配置
1）core-site.xml
$ cat ../../apache/hadoop-1.0.2/conf/core-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://localhost:54310</value>
</property>
</configuration>
2）mapred-site.xml
$ cat ../../apache/hadoop-1.0.2/conf/mapred-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>localhost:54311</value>
</property>
<property>
<name>mapred.child.java.opts</name>
<value>-Xmx512m</value>
</property>
</configuration>
3）iptables的端口
# cat /etc/sysconfig/iptables
*filter
:INP UT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 5901 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 2049 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 54310 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 54311 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
# /etc/init.d/iptables restart
iptables: Flushing firewall rules: [ OK ]
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Unloading modules: [ OK ]
iptables: Applying firewall rules: [ OK ]
$ netstat -an | grep 54310
$ netstat -an | grep 54311
tcp 0 0 ::ffff:127.0.0.1:54311 :::* LISTEN
tcp 238 0 ::ffff:127.0.0.1:54311 ::ffff:127.0.0.1:44216 ESTABLISHED
tcp 0 0 ::ffff:127.0.0.1:44216 ::ffff:127.0.0.1:54311 ESTABLISHED
4）开始Hadoop
$ $HADOOP_HOME/bin/start-all.sh
Warning: $HADOOP_HOME is deprecated.
starting namenode, logging to /home/mahmood/bigdatabench/apache/hadoop-1.0.2/libexec/../logs/hadoop-mahmood-namenode-tiger.out
mahmood@localhost's password:
localhost: Warning: $HADOOP_HOME is deprecated.
localhost:
localhost: starting datanode, logging to /home/mahmood/bigdatabench/apache/hadoop-1.0.2/libexec/../logs/hadoop-mahmood-datanode-tiger.out
mahmood@localhost's password:
localhost: Warning: $HADOOP_HOME is deprecated.
localhost:
localhost: secondarynamenode running as process 7583. Stop it first.
jobtracker running as process 7792. Stop it first.
mahmood@localhost's password:
localhost: Warning: $HADOOP_HOME is deprecated.
localhost:
localhost: tasktracker running as process 8019. Stop it first.
5）检查Java进程
$ jps
10292 Jps
8019 TaskTracker
7792 JobTracker
7583 SecondaryNameNode
6）我仍然得到那个错误
$ hadoop fs -ls hdfs://localhost:54310/
Warning: $HADOOP_HOME is deprecated.
15/04/17 10:59:57 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 0 time(s).
15/04/17 10:59:58 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 1 time(s).
15/04/17 10:59:59 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 2 time(s).
15/04/17 11:00:00 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 3 time(s).
15/04/17 11:00:01 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 4 time(s).
15/04/17 11:00:02 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 5 time(s).
15/04/17 11:00:03 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 6 time(s).
15/04/17 11:00:04 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 7 time(s).
15/04/17 11:00:05 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 8 time(s).
15/04/17 11:00:06 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 9 time(s).
Bad connection to FS. command aborted. exception: Call to localhost/127.0.0.1:54310 failed on connection exception: java.net.ConnectException: Connection refused
更新：
当我认为自己已经格式化了文件系统时，事实证明hdfs format命令已终止，并且我没有注意到。原因是我Re-format filesystem in /home/mahmood/bigdatabench/apache/hadoop-1.0.2/folders/name ? (Y or N)用y回答了这个问题。但是正确的答案是按Y（大写字母！）。
所以正确的步骤是
1-stop-all.sh
2- hadoop namenode-格式
3-开始all.sh
IPC错误已经消失了:)
我该如何解决？
我认为，您正在从客户端计算机运行此命令，在您的配置文件中，您需要提供 ip 地址/主机名而不是 localhost 以避免此类问题。尝试在配置文件中包含主机名，然后再试一次。