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From Pravin Sinha <pks_chen...@yahoo.com>
Subject Re: namenode uestion
Date Sun, 10 May 2015 16:11:45 GMT
Hi Asanjar,
My understanding is that it returns serialized BlockLocation instances which holds the location
information for an HDFS block. It contains hostnames and hostnames:ports of datanodes apart
from some other info.
I am a newbie in Hadoop, somebody may connfirm on this.

     On Friday, 8 May 2015 10:21 PM, MrAsanjar . <afsanjar@gmail.com> wrote:

 hi all,
I have an hdfs question, my understanding is, namenode sends a list of datanodes to hadoop
client to send data blocks based on replication setting. The question is, does the list from
namenode has IP addresses or hostnames, or both of the datanodes.

NN -------> Client  ----> DN1 ------> DN2 ------> DN3 

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