Cloudera
CCA-410 · Question #2
You set up the Hadoop cluster using NameNode Federation. One NameNode manages the/users namespace and one NameNode manages the/data namespace. What happens when client tries to write a file…
The correct answer is C. The file successfully writes to /report/myreport.txt. The metadata for the file is managed by the first. The current HDFS architecture allows only a single namespace for the entire cluster. A single Namenode manages this namespace. HDFS Federation addresses limitation of current architecture by adding support multiple Namenodes/namespaces to HDFS file system. HDFS Federation…
Requirements Analysis and Design Definition
Question
You set up the Hadoop cluster using NameNode Federation. One NameNode manages the/users namespace and one NameNode manages the/data namespace. What happens when client tries to write a file to/reports/myreport.txt?
Options
- AThe file successfully writes to /users/reports/myreports/myreport.txt.
- BThe client throws an exception.
- CThe file successfully writes to /report/myreport.txt. The metadata for the file is managed by the first
- DThe file writes fails silently; no file is written, no error is reported.
How the community answered
(53 responses)- A8% (4)
- B15% (8)
- C74% (39)
- D4% (2)
Explanation
- The current HDFS architecture allows only a single namespace for the entire cluster. A single Namenode manages this namespace. HDFS Federation addresses limitation of current architecture by adding support multiple Namenodes/namespaces to HDFS file system. * HDFS Federation enables multiple NameNodes in a cluster for horizontal scalability of NameNode. All these NameNodes work independently and don't require any co-ordination. A DataNode can register with multiple NameNodes in the cluster and can store the data blocks for multiple NameNodes.
Topics
#NameNode Federation#HDFS Namespace#File Write Behavior#Hadoop Architecture
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