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MapReduce, mail # user - About connection to NameNode in NameNode-HA


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Re: About connection to NameNode in NameNode-HA
Shinichi Yamashita 2012-11-04, 12:24
Hi Todd,

Thank you for your answer.
I will submit a patch whitch does not output log by some operation.

Regards,
Shinichi
2012/11/2 Todd Lipcon <[EMAIL PROTECTED]>:
> Hi Yamashita,
>
> Yes, the order in which the nodes are tried is indeed the order in which
> your nodes are listed in the configuration.
>
> We currently do write StandybException into the standby's logs, but I think
> it's a good idea for an improvement to remove that, since it is an "expected
> exception" and could cause too much log spew. Want to submit a patch?
>
> -Todd
>
> On Thu, Nov 1, 2012 at 8:44 AM, Shinichi Yamashita <[EMAIL PROTECTED]>
> wrote:
>>
>> Hi,
>>
>> I write hdfs-site.xml of all nodes as follows in NameNode-HA.
>>
>> ----------
>> ... snip  ...
>>   <property>
>>     <name>dfs.namenode.rpc-address.ns.nn1</name>
>>     <value>nn1:8020</value>
>>   </property>
>>  <property>
>>     <name>dfs.namenode.rpc-address.ns.nn2</name>
>>     <value>nn2:8020</value>
>>  </property>
>>  <property>
>>     <name>dfs.client.failover.proxy.provider.nn</name>
>>
>> <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
>>  </property>
>> ... snip ...
>> ----------
>> (nn : nameserviceID, nn1: NameNode1, nn2: NameNode2)
>>
>> Is the order of connection from DFSClient to NameNode always "(1) nn1"
>> and "(2) nn2" ?
>> And will "StandbyException" messages be written in the log of nn1 If
>> the state of nn1 is standby?
>>
>> Regards,
>> Shinichi
>
>
>
>
> --
> Todd Lipcon
> Software Engineer, Cloudera