Grokking the System Design Interview, Volume II
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High-level Architecture

We know what problem HDFS solves. Now we look at how it is actually built.

HDFS architecture

HDFS breaks every file it stores into fixed-size blocks. A block is one piece of a file, 128 megabytes by default, though a file can use a different size.

Storing a file this way means the system has to track two things: the actual file data, and the metadata that describes it. That metadata covers things like how many blocks the file has, where each block lives, and the file's total size.

Two kinds of server split that work. The NameNode manages the file system's metadata

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Amey Naik

· 5 years ago

"This means that within each node, the data is stored in sorted order according to the employee_id column."

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A

Amey Naik

· 5 years ago

"while querying, we cannot add any column in the where clause other than the primary key."

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A

Amey Naik

· 5 years ago

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