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MapReduce >> mail # user >> How to start Data Replicated Blocks in HDFS manually.

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Re: How to start Data Replicated Blocks in HDFS manually.
The problem may be in default replication factor, which is 3, so first
check in hdfs-site.xml for replication factor is specified or not. if it
not add that parameter and restart the cluster   ---> first option

2nd Option : change the replicatio factor of the root directory of hdfs to
2 using following command

bin/hadoop dfs -setrep -R -w 2 /

this will chage the replication factor 2 two.

this problem may be also because you have two datanodes and replication
factor is 3. so you can think of the senario when you have two bucket and
you have 3 objects to keep.

Shashwat Shriparv

On Mon, Feb 25, 2013 at 7:50 PM, Nitin Pawar <[EMAIL PROTECTED]>wrote:

> did you start the cluster with replication factor 3 and later changed it
> to 2?
> also did you enable rack awareness in your configs and both the nodes are
> on same rack?
> On Mon, Feb 25, 2013 at 7:45 PM, Dhanasekaran Anbalagan <
>> Hi Guys,
>> We have cluster with two data nodes. We configured data replication
>> factor two.
>> when  i copy data  to hdfs, Data's are not fully replicated. It's says * Number
>> of Under-Replicated Blocks : 15115*
>> How to manually invoke the Data replication in HDFS.
>> I restarted cluster also. It's not helps me
>> Please guide me guys.
>> -Dhanasekaran.
>> Did I learn something today? If not, I wasted it.
> --
> Nitin Pawar