Cloudera
CCA-500 · Question #20
A slave node in your cluster has 4 TB hard drives installed (4 x 2TB). The DataNode is configured to store HDFS blocks on all disks. You set the value of the dfs.datanode.du.reserved parameter to…
The correct answer is B. 100GB on each hard drive may not be used to store HDFS blocks. Reserved space in bytes per volume. Always leave this much space free for non dfs use.
Configuration
Question
A slave node in your cluster has 4 TB hard drives installed (4 x 2TB). The DataNode is configured to store HDFS blocks on all disks. You set the value of the dfs.datanode.du.reserved parameter to 100 GB. How does this alter HDFS block storage?
Options
- A25GB on each hard drive may not be used to store HDFS blocks
- B100GB on each hard drive may not be used to store HDFS blocks
- CAll hard drives may be used to store HDFS blocks as long as at least 100 GB in total is available
- DA maximum if 100 GB on each hard drive may be used to store HDFS blocks
How the community answered
(38 responses)- A13% (5)
- B71% (27)
- C5% (2)
- D11% (4)
Explanation
Reserved space in bytes per volume. Always leave this much space free for non dfs use.
Topics
#dfs.datanode.du.reserved#disk reservation#DataNode storage#HDFS configuration
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