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Hadoop, mail # user - UnknownHostException


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Re: UnknownHostException
bharath vissapragada 2009-06-23, 16:59
It worked fine when i updated /etc/hosts file (of all the slaves) and
writing fully qualified domain name in the hadoop-site.xml.

It worked fine for sometime .. then started giving new error

09/06/23 22:21:49 INFO ipc.Client: Retrying connect to server: master/
10.2.24.21:54310. Already tried 0 time(s).
09/06/23 22:21:50 INFO ipc.Client: Retrying connect to server: master/
10.2.24.21:54310. Already tried 1 time(s).
09/06/23 22:21:51 INFO ipc.Client: Retrying connect to server: master/
10.2.24.21:54310. Already tried 2 time(s).
09/06/23 22:21:52 INFO ipc.Client: Retrying connect to server: master/
10.2.24.21:54310. Already tried 3 time(s).
09/06/23 22:21:53 INFO ipc.Client: Retrying connect to server: master/
10.2.24.21:54310. Already tried 4 time(s).
09/06/23 22:21:54 INFO ipc.Client: Retrying connect to server: master/
10.2.24.21:54310. Already tried 5 time(s).
09/06/23 22:21:55 INFO ipc.Client: Retrying connect to server: master/
10.2.24.21:54310. Already tried 6 time(s).
09/06/23 22:21:56 INFO ipc.Client: Retrying connect to server: master/
10.2.24.21:54310. Already tried 7 time(s).
09/06/23 22:21:57 INFO ipc.Client: Retrying connect to server: master/
10.2.24.21:54310. Already tried 8 time(s).
09/06/23 22:21:58 INFO ipc.Client: Retrying connect to server: master/
10.2.24.21:54310. Already tried 9 time(s).
On Tue, Jun 23, 2009 at 8:33 PM, Raghu Angadi <[EMAIL PROTECTED]> wrote:

> Raghu Angadi wrote:
>
>>
>> This is at RPC client level and there is requirement for fully qualified
>>
>
> I meant to say "there is NO requirement ..."
>
>  hostname. May be "." at the end of "10.2.24.21" causing the problem?
>>
>> btw, in 0.21 even fs.default.name does not need to be fully qualified
>>
>
> that fix is probably in 0.20 too.
>
> Raghu.
>
>
>  name.. anything that resolves to an ipaddress is fine (at least for
>> common/FS and HDFS).
>>
>> Raghu.
>>
>> Matt Massie wrote:
>>
>>> fs.default.name in your hadoop-site.xml needs to be set to a
>>> fully-qualified domain name (instead of an IP address)
>>>
>>> -Matt
>>>
>>> On Jun 23, 2009, at 6:42 AM, bharath vissapragada wrote:
>>>
>>>  when i try to execute the command bin/start-dfs.sh  , i get the
>>>> following
>>>> error . I have checked the hadoop-site.xml file on all the nodes , and
>>>> they
>>>> are fine ..
>>>> can some-one help me out!
>>>>
>>>> 10.2.24.21: Exception in thread "main" java.net.UnknownHostException:
>>>> unknown host: 10.2.24.21.
>>>> 10.2.24.21:     at
>>>> org.apache.hadoop.ipc.Client$Connection.<init>(Client.java:195)
>>>> 10.2.24.21:     at
>>>> org.apache.hadoop.ipc.Client.getConnection(Client.java:779)
>>>> 10.2.24.21:     at org.apache.hadoop.ipc.Client.call(Client.java:704)
>>>> 10.2.24.21:     at
>>>> org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:216)
>>>> 10.2.24.21:     at
>>>> org.apache.hadoop.dfs.$Proxy4.getProtocolVersion(Unknown
>>>> Source)
>>>> 10.2.24.21:     at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:319)
>>>> 10.2.24.21:     at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:306)
>>>> 10.2.24.21:     at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:343)
>>>> 10.2.24.21:     at org.apache.hadoop.ipc.RPC.waitForProxy(RPC.java:288)
>>>>
>>>
>>>
>>
>>
>