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From Joey Echeverria <j...@cloudera.com>
Subject Re: hftp in Hadoop 0.20.2
Date Fri, 10 Aug 2012 18:24:51 GMT
Try:

$ telnet pnjhadoopnn01 50070

-Joey

On Fri, Aug 10, 2012 at 1:10 PM, Jian Fang
<jian.fang.subscribe@gmail.com> wrote:
> Here is the property in hdfs-site.xml
>
>    <property>
>       <name>dfs.http.address</name>
>       <value>pnjhadoopnn01:50070</value>
>    </property>
>
> Thanks,
>
> Jian
>
>
> On Fri, Aug 10, 2012 at 11:46 AM, Harsh J <harsh@cloudera.com> wrote:
>>
>> Yes the test was to figure out if there really was a listener on
>> 50070. Can you check the hdfs-site.xml on the NN machine for what its
>> dfs.http.address may really be using for its port?
>>
>> On Fri, Aug 10, 2012 at 7:48 PM, Jian Fang
>> <jian.fang.subscribe@gmail.com> wrote:
>> > Hi Harsh,
>> >
>> > Seems the -p requires the root privilege, which I don't have. I run
>> > "netstat -a | grep 50070", but did not get back anything. As I said,
>> > telnet
>> > did not work either.
>> >
>> > [hadoop@pnjhadoopnn01 ~]$ telnet  pnjhadoopnn01 50070
>> > Trying xx.xx.xx.xx...
>> > telnet: connect to address xx.xx.xx.xx: Connection refused
>> > telnet: Unable to connect to remote host: Connection refused
>> >
>> > [hadoop@pnjhadoopnn01 ~]$ telnet localhost 50070
>> > Trying 127.0.0.1...
>> > telnet: connect to address 127.0.0.1: Connection refused
>> > telnet: Unable to connect to remote host: Connection refused
>> >
>> > Thanks,
>> >
>> > Jian
>> >
>> > On Fri, Aug 10, 2012 at 1:50 AM, Harsh J <harsh@cloudera.com> wrote:
>> >>
>> >> Jian,
>> >>
>> >> From your NN, can you get us the output "netstat -anp | grep 50070"?
>> >>
>> >> On Fri, Aug 10, 2012 at 9:29 AM, Jian Fang
>> >> <jian.fang.subscribe@gmail.com> wrote:
>> >> > Thanks Harsh. But there is no firewall there, the two clusters are
on
>> >> > the
>> >> > same networks. I cannot telnet to the port even on the same machine.
>> >> >
>> >> >
>> >> > On Thu, Aug 9, 2012 at 6:00 PM, Harsh J <harsh@cloudera.com>
wrote:
>> >> >>
>> >> >> Hi Jian,
>> >> >>
>> >> >> HFTP is always-on by default. Can you check and make sure that
the
>> >> >> firewall isn't the cause of the connection refused on port 50070
on
>> >> >> the NN and ports 50075 on the DNs here?
>> >> >>
>> >> >> On Fri, Aug 10, 2012 at 1:47 AM, Jian Fang
>> >> >> <jian.fang.subscribe@gmail.com> wrote:
>> >> >> > Hi,
>> >> >> >
>> >> >> > We have a hadoop cluster of version 0.20.2 in production.
Now we
>> >> >> > have
>> >> >> > another new Hadoop cluster using cloudera's CDH3U4. We like
to run
>> >> >> > distcp to
>> >> >> > copy files between the two clusters. Since the hadoop versions
are
>> >> >> > different, we have to use hftp protocol to copy files based
on the
>> >> >> > hadoop
>> >> >> > document here:
>> >> >> > http://hadoop.apache.org/common/docs/r0.20.2/distcp.html#cpver.
>> >> >> >
>> >> >> > The problem is that I cannot access files via hftp from the
>> >> >> > current
>> >> >> > production 0.20.2 cluster even though I can see the following
>> >> >> > setting
>> >> >> > from
>> >> >> > job tracker UI.
>> >> >> >
>> >> >> > dfs.http.address pnjhadoopnn01:50070
>> >> >> >
>> >> >> > I tried to telnet this port, but got "connection refused"
error.
>> >> >> > Seems
>> >> >> > the
>> >> >> > hftp service is not actually running. Could someone tell me
how to
>> >> >> > enable
>> >> >> > the hftp service in the 0.20.2 hadoop cluster so that I can
run
>> >> >> > distcp?
>> >> >> >
>> >> >> > Thanks in advance,
>> >> >> >
>> >> >> > John
>> >> >>
>> >> >>
>> >> >>
>> >> >> --
>> >> >> Harsh J
>> >> >
>> >> >
>> >>
>> >>
>> >>
>> >> --
>> >> Harsh J
>> >
>> >
>>
>>
>>
>> --
>> Harsh J
>
>



-- 
Joey Echeverria
Principal Solutions Architect
Cloudera, Inc.

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