Categories

Jan 26 in Big Data | Hadoop
Q:

What is a block and block scanner in HDFS? 

1 Answer

Jan 26

 

Block - The minimum amount of data that can be read or written is generally referred to as a “block” in HDFS. The default size of a block in HDFS is 64MB.

 

Block Scanner - Block Scanner tracks the list of blocks present on a DataNode and verifies them to find any kind of checksum errors. Block Scanners use a throttling mechanism to reserve disk bandwidth on the datanode.

 

Click here to read more about Loan/Mortgage
Click here to read more about Insurance

Related questions

Madanswer
Jan 26 in Big Data | Hadoop
Nov 7 in Hadoop
Jan 11 in Big Data | Hadoop
...