top button
Flag Notify
    Connect to us
      Facebook Login
      Site Registration Why to Join

Facebook Login
Site Registration

What is the meaning of underreplication in HDFS?

0 votes
85 views
ANo replication is happening in the data nodes.
BReplication process is very slow in the data nodes.
CThe frequency of replication in data nodes is very low.
DThe number of replicated copies is less than as specified by the replication factor.

Correct Option: 4  
posted Nov 30, 2017 by anonymous

Looking for an answer?  Promote on:
Facebook Share Button Twitter Share Button LinkedIn Share Button

Similar Questions
0 votes

I have a basic question regarding the HDFS file read. I want to know what happens, when the following steps are followed:

  1. Client opens the file for reading and starts reading the file.
  2. In the meantime, someone deletes the file and file moves to the trash folder

Will Step 1. succeed? I feel, since the client has already opened the file and file still exists in .trash, the client should continue to read the file.

0 votes

My cluster version hdfs 2.2 stable ( 2 ha namenodes, 10 datanodes). I was command bin/hdfs dfs -setrep -R 2 / ( replication 1 to 2 )

I found that HDFS is actually replicating the under replicated blocks but it works very slowly. HDFS performs the replication about 1 block per second.

I have about 400000 under replicated blocks so it will take about 4 more days. Is there any way to speed it up?

Contact Us
+91 9880187415
sales@queryhome.net
support@queryhome.net
#280, 3rd floor, 5th Main
6th Sector, HSR Layout
Bangalore-560102
Karnataka INDIA.
QUERY HOME
...