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What is the meaning of underreplication in HDFS?

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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

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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.

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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?

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