FAQ
Dear All,
I met a problem that when I start the hadoop ,I could not find the slave
nodes , my OS system is CentOS, when run the mapreduce program, it alarms me
that:


10/10/16 20:32:41 INFO ipc.Client: Retrying connect to server: zawc1/
192.168.1.101:9000. Already tried 0 time(s).
10/10/16 20:32:42 INFO ipc.Client: Retrying connect to server: zawc1/
192.168.1.101:9000. Already tried 1 time(s).
10/10/16 20:32:43 INFO ipc.Client: Retrying connect to server: zawc1/
192.168.1.101:9000. Already tried 2 time(s).
10/10/16 20:32:44 INFO ipc.Client: Retrying connect to server: zawc1/
192.168.1.101:9000. Already tried 3 time(s).
10/10/16 20:32:45 INFO ipc.Client: Retrying connect to server: zawc1/
192.168.1.101:9000. Already tried 4 time(s).
10/10/16 20:32:46 INFO ipc.Client: Retrying connect to server: zawc1/
192.168.1.101:9000. Already tried 5 time(s).
10/10/16 20:32:47 INFO ipc.Client: Retrying connect to server: zawc1/
192.168.1.101:9000. Already tried 6 time(s).
10/10/16 20:32:48 INFO ipc.Client: Retrying connect to server: zawc1/
192.168.1.101:9000. Already tried 7 time(s).
10/10/16 20:32:49 INFO ipc.Client: Retrying connect to server: zawc1/
192.168.1.101:9000. Already tried 8 time(s).
10/10/16 20:32:50 INFO ipc.Client: Retrying connect to server: zawc1/
192.168.1.101:9000. Already tried 9 time(s).
java.net.ConnectException: Call to zawc1/192.168.1.101:9000 failed on
connection exception: java.net.ConnectException: Connection refused
at org.apache.hadoop.ipc.Client.wrapException(Client.java:724)
at org.apache.hadoop.ipc.Client.call(Client.java:700)
at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:216)
at $Proxy0.getProtocolVersion(Unknown Source)
at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:348)
at
org.apache.hadoop.hdfs.DFSClient.createRPCNamenode(DFSClient.java:104)
at org.apache.hadoop.hdfs.DFSClient.(DistributedFileSystem.java:75)
at
org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1367)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:56)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1379)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:215)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:120)
at
org.apache.hadoop.examples.PiEstimator.launch(PiEstimator.java:187)
at org.apache.hadoop.examples.PiEstimator.run(PiEstimator.java:245)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.examples.PiEstimator.main(PiEstimator.java:252)
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$ProgramDescription.invoke(ProgramDriver.java:68)
at
org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:141)
at
org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:61)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.RunJar.main(RunJar.java:165)
at org.apache.hadoop.mapred.JobShell.run(JobShell.java:54)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
at org.apache.hadoop.mapred.JobShell.main(JobShell.java:68)
Caused by: java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574)
at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100)
at
org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:300)
at
org.apache.hadoop.ipc.Client$Connection.access$1700(Client.java:177)
at org.apache.hadoop.ipc.Client.getConnection(Client.java:801)
at org.apache.hadoop.ipc.Client.call(Client.java:686)
... 31 more

Who can tell me what is the reason? Thanks for any help...

Search Discussions

  • Jander g at Oct 16, 2010 at 2:20 pm
    Hi,
    Didn't you format the HDFS ? or maybe the HDFS was broken.
    On Sat, Oct 16, 2010 at 9:01 PM, 冯超 wrote:

    Dear All,
    I met a problem that when I start the hadoop ,I could not find the slave
    nodes , my OS system is CentOS, when run the mapreduce program, it alarms
    me
    that:


    10/10/16 20:32:41 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 0 time(s).
    10/10/16 20:32:42 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 1 time(s).
    10/10/16 20:32:43 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 2 time(s).
    10/10/16 20:32:44 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 3 time(s).
    10/10/16 20:32:45 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 4 time(s).
    10/10/16 20:32:46 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 5 time(s).
    10/10/16 20:32:47 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 6 time(s).
    10/10/16 20:32:48 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 7 time(s).
    10/10/16 20:32:49 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 8 time(s).
    10/10/16 20:32:50 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 9 time(s).
    java.net.ConnectException: Call to zawc1/192.168.1.101:9000 failed on
    connection exception: java.net.ConnectException: Connection refused
    at org.apache.hadoop.ipc.Client.wrapException(Client.java:724)
    at org.apache.hadoop.ipc.Client.call(Client.java:700)
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:216)
    at $Proxy0.getProtocolVersion(Unknown Source)
    at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:348)
    at
    org.apache.hadoop.hdfs.DFSClient.createRPCNamenode(DFSClient.java:104)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:176)
    at

    org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:75)
    at
    org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1367)
    at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:56)
    at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1379)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:215)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:120)
    at
    org.apache.hadoop.examples.PiEstimator.launch(PiEstimator.java:187)
    at org.apache.hadoop.examples.PiEstimator.run(PiEstimator.java:245)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
    at org.apache.hadoop.examples.PiEstimator.main(PiEstimator.java:252)
    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:141)
    at
    org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:61)
    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:165)
    at org.apache.hadoop.mapred.JobShell.run(JobShell.java:54)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
    at org.apache.hadoop.mapred.JobShell.main(JobShell.java:68)
    Caused by: java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at
    sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574)
    at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100)
    at
    org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:300)
    at
    org.apache.hadoop.ipc.Client$Connection.access$1700(Client.java:177)
    at org.apache.hadoop.ipc.Client.getConnection(Client.java:801)
    at org.apache.hadoop.ipc.Client.call(Client.java:686)
    ... 31 more

    Who can tell me what is the reason? Thanks for any help...


    --
    Thanks,
    Jander
  • 冯超 at Oct 16, 2010 at 2:30 pm
    Thank you very much! I have fixed that problem.
    There is something wrong with the host mapping... the default mapping is
    127.0.0.1, not the exact ip address.


    2010/10/16 Jander g <jandergj@gmail.com>
    Hi,
    Didn't you format the HDFS ? or maybe the HDFS was broken.
    On Sat, Oct 16, 2010 at 9:01 PM, 冯超 wrote:

    Dear All,
    I met a problem that when I start the hadoop ,I could not find the slave
    nodes , my OS system is CentOS, when run the mapreduce program, it alarms
    me
    that:


    10/10/16 20:32:41 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 0 time(s).
    10/10/16 20:32:42 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 1 time(s).
    10/10/16 20:32:43 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 2 time(s).
    10/10/16 20:32:44 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 3 time(s).
    10/10/16 20:32:45 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 4 time(s).
    10/10/16 20:32:46 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 5 time(s).
    10/10/16 20:32:47 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 6 time(s).
    10/10/16 20:32:48 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 7 time(s).
    10/10/16 20:32:49 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 8 time(s).
    10/10/16 20:32:50 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 9 time(s).
    java.net.ConnectException: Call to zawc1/192.168.1.101:9000 failed on
    connection exception: java.net.ConnectException: Connection refused
    at org.apache.hadoop.ipc.Client.wrapException(Client.java:724)
    at org.apache.hadoop.ipc.Client.call(Client.java:700)
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:216)
    at $Proxy0.getProtocolVersion(Unknown Source)
    at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:348)
    at
    org.apache.hadoop.hdfs.DFSClient.createRPCNamenode(DFSClient.java:104)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:176)
    at

    org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:75)
    at
    org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1367)
    at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:56)
    at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1379)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:215)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:120)
    at
    org.apache.hadoop.examples.PiEstimator.launch(PiEstimator.java:187)
    at
    org.apache.hadoop.examples.PiEstimator.run(PiEstimator.java:245)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
    at
    org.apache.hadoop.examples.PiEstimator.main(PiEstimator.java:252)
    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:141)
    at
    org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:61)
    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:165)
    at org.apache.hadoop.mapred.JobShell.run(JobShell.java:54)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
    at org.apache.hadoop.mapred.JobShell.main(JobShell.java:68)
    Caused by: java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at
    sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574)
    at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100)
    at
    org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:300)
    at
    org.apache.hadoop.ipc.Client$Connection.access$1700(Client.java:177)
    at org.apache.hadoop.ipc.Client.getConnection(Client.java:801)
    at org.apache.hadoop.ipc.Client.call(Client.java:686)
    ... 31 more

    Who can tell me what is the reason? Thanks for any help...


    --
    Thanks,
    Jander
  • Kaiming huang at Oct 17, 2010 at 1:13 am
    Yeah,I have met the same problem.
    Don't use "localhost" or "127.0.0.1",just use your hostname or exact ip
    address!

    在 2010年10月16日 下午10:29,冯超 <hsmyy198712@gmail.com>写道:
    Thank you very much! I have fixed that problem.
    There is something wrong with the host mapping... the default mapping is
    127.0.0.1, not the exact ip address.


    2010/10/16 Jander g <jandergj@gmail.com>
    Hi,
    Didn't you format the HDFS ? or maybe the HDFS was broken.
    On Sat, Oct 16, 2010 at 9:01 PM, 冯超 wrote:

    Dear All,
    I met a problem that when I start the hadoop ,I could not find the slave
    nodes , my OS system is CentOS, when run the mapreduce program, it
    alarms
    me
    that:


    10/10/16 20:32:41 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 0 time(s).
    10/10/16 20:32:42 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 1 time(s).
    10/10/16 20:32:43 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 2 time(s).
    10/10/16 20:32:44 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 3 time(s).
    10/10/16 20:32:45 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 4 time(s).
    10/10/16 20:32:46 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 5 time(s).
    10/10/16 20:32:47 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 6 time(s).
    10/10/16 20:32:48 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 7 time(s).
    10/10/16 20:32:49 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 8 time(s).
    10/10/16 20:32:50 INFO ipc.Client: Retrying connect to server: zawc1/
    192.168.1.101:9000. Already tried 9 time(s).
    java.net.ConnectException: Call to zawc1/192.168.1.101:9000 failed on
    connection exception: java.net.ConnectException: Connection refused
    at org.apache.hadoop.ipc.Client.wrapException(Client.java:724)
    at org.apache.hadoop.ipc.Client.call(Client.java:700)
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:216)
    at $Proxy0.getProtocolVersion(Unknown Source)
    at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:348)
    at
    org.apache.hadoop.hdfs.DFSClient.createRPCNamenode(DFSClient.java:104)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:176)
    at
    org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:75)
    at
    org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1367)
    at
    org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:56)
    at
    org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1379)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:215)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:120)
    at
    org.apache.hadoop.examples.PiEstimator.launch(PiEstimator.java:187)
    at
    org.apache.hadoop.examples.PiEstimator.run(PiEstimator.java:245)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
    at
    org.apache.hadoop.examples.PiEstimator.main(PiEstimator.java:252)
    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$ProgramDescription.invoke(ProgramDriver.java:68)
    at
    org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:141)
    at
    org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:61)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:165)
    at org.apache.hadoop.mapred.JobShell.run(JobShell.java:54)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
    at org.apache.hadoop.mapred.JobShell.main(JobShell.java:68)
    Caused by: java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at
    sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574)
    at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100)
    at
    org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:300)
    at
    org.apache.hadoop.ipc.Client$Connection.access$1700(Client.java:177)
    at org.apache.hadoop.ipc.Client.getConnection(Client.java:801)
    at org.apache.hadoop.ipc.Client.call(Client.java:686)
    ... 31 more

    Who can tell me what is the reason? Thanks for any help...


    --
    Thanks,
    Jander

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groupcommon-user @
categorieshadoop
postedOct 16, '10 at 1:02p
activeOct 17, '10 at 1:13a
posts4
users3
websitehadoop.apache.org...
irc#hadoop

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冯超: 2 posts Jander g: 1 post Kaiming huang: 1 post

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