在mac os x 10.8上设置hadoop时出现的问题

Question

我已经在我的mac上设置了一些东西来安装hadoop。但是有一条错误消息是这样的：

13/02/18 04:05:52 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 0 time(s).
13/02/18 04:05:53 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 1 time(s).
13/02/18 04:05:54 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 2 time(s).
13/02/18 04:05:55 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 3 time(s).
13/02/18 04:05:56 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 4 time(s).
13/02/18 04:05:57 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 5 time(s).
13/02/18 04:05:58 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 6 time(s).
13/02/18 04:05:59 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 7 time(s).
13/02/18 04:06:00 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 8 time(s).
13/02/18 04:06:01 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 9 time(s).
java.lang.RuntimeException: java.net.ConnectException: Call to localhost/127.0.0.1:9000 failed on connection exception: java.net.ConnectException: Connection refused
    at org.apache.hadoop.mapred.JobConf.getWorkingDirectory(JobConf.java:546)
    at org.apache.hadoop.mapred.FileInputFormat.setInputPaths(FileInputFormat.java:318)
    at org.apache.hadoop.examples.PiEstimator.estimate(PiEstimator.java:265)
    at org.apache.hadoop.examples.PiEstimator.run(PiEstimator.java:342)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
    at org.apache.hadoop.examples.PiEstimator.main(PiEstimator.java:351)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
    at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
    at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:64)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
Caused by: java.net.ConnectException: Call to localhost/127.0.0.1:9000 failed on connection exception: java.net.ConnectException: Connection refused
    at org.apache.hadoop.ipc.Client.wrapException(Client.java:1099)
    at org.apache.hadoop.ipc.Client.call(Client.java:1075)
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225)
    at $Proxy1.getProtocolVersion(Unknown Source)
    at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:396)
    at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:379)
    at org.apache.hadoop.hdfs.DFSClient.createRPCNamenode(DFSClient.java:119)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:238)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:203)
    at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:89)
    at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1386)
    at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:66)
    at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1404)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:254)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:123)
    at org.apache.hadoop.mapred.JobConf.getWorkingDirectory(JobConf.java:542)
    ... 17 more
Caused by: java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:599)
    at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
    at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:489)
    at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:434)
    at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:560)
    at org.apache.hadoop.ipc.Client$Connection.access$2000(Client.java:184)
    at org.apache.hadoop.ipc.Client.getConnection(Client.java:1206)
    at org.apache.hadoop.ipc.Client.call(Client.java:1050)
    ... 31 more

然后进入jps检查服务，结果是: 20635 Jps

20466 TaskTracker

20189 DataNode

20291 SecondaryNameNode

我不知道如何处理这个错误。有人能给我一个答案吗？非常感谢！

Answer 1

实际上，(hadoop应该运行的)所有进程都没有运行，因为in配置错误。我不熟悉Mac，但在linux和windows上，我们需要将hadoop enteries放在主机文件(etc/ hosts )中进行连接，我非常确定这应该是针对Mac.Now的。

您需要将hadoop条目作为本地机器放入该文件中，如127.0.0.1

实际上，您需要将其与您机器的实际IP放在一起

例如

hadoop-machine 127.0.0.1 -->(此处放置环回IP是错误的，因为hadoop将尝试连接此IP)。

删除这个127.0.0.1，并将您机器的实际IP放在此条目的前面。You can find ip of your mac machine eaisly.here是一些与hadoop没有直接关系的问题，但我猜它们会对您有所帮助。

Question 1、Question 2、Question 3

Answer 2

这可能会有一点帮助。但首先必须使用以下命令删除较早的安装

rm -rf /usr/local/Cellar /usr/local/.git && brew cleanup

然后你可以开始在你的Mac上重新安装Hadoop。

步骤1:安装Homebrew

curl$

-e "$(curl -fsSL https://raw.github.com/mxcl/homebrew/go)“

第2步:安装Hadoop

$ brew安装hadoop

假设brew安装了Hadoop 1.2.1

第3步:配置Hadoop

$ cd /usr/local/Cellar/hadoop/1.2.1/libexec

在conf/hadoop-env.sh中添加以下行：

导出HADOOP_OPTS="-Djava.security.krb5.realm= -Djava.security.krb5.kdc=“

将以下行添加到conf/core-site.xml的配置标记内：

fs.default.name hdfs://本地主机:9000

将以下行添加到conf/hdfs-site.xml的配置标记内：

dfs.replication 1

将以下行添加到conf/mapred-site.xml的配置标记内：

mapred.job.tracker本地主机:9001

转到系统首选项>共享。确保选中“Remote Login”。

$ ssh-keygen -t rsa $ cat ~/.ssh/id_rsa.pub >> ~/.ssh/_key

第4步:启用对本地主机的SSH

授权密钥$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/

_key

步骤5:格式化Hadoop文件系统

hadoop$

/hadoop名称节点-format

第6步:启动Hadoop

$ bin/start-all.sh

确保所有Hadoop进程都在运行：

$ jps

运行Hadoop示例：

还有一件事！“brew update”将hadoop二进制文件更新到最新版本(目前为1.2.1)。

Answer 3

我遇到了同样的错误:在所有的辅助名称节点日志文件中出现了ConnectException: Connection refused。

但我还在namenode的日志文件中发现了以下内容：

2015-10-25 16:35:15,720 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: Failed to start namenode.
org.apache.hadoop.hdfs.server.common.InconsistentFSStateException: Directory /private/tmp/hadoop-admin/dfs/name is in an inconsistent state: storage directory does not exist or is not accessible.

因此，我做了一个

hadoop namenode -format

而且这个问题已经消失了。因此，错误消息只是关于namenode没有成功启动的事实。