33-checksum

Implement Checksum based

1. Identify if data in WAL or Bitcask is corrupt using Checksum
2. TODO: Implement database recovery as discussed in the session

Results

Corrupt WAL (changed n to m)

Output

Key Points

1. Checksum Algorithm Used: CRC32

• CRC32 (Cyclic Redundancy Check, 32-bit) is an algorithm designed to detect accidental changes in data.
• Characteristics:
  • Fast and computationally efficient - ensures integrity
  • Produces a fixed 32-bit checksum for a given input, regardless of its length.

2. Checksum Representation

• In a little-endian format, the least significant byte (LSB) is stored first in memory. This byte order is critical when encoding/decoding binary data for consistent interpretation.
• It ensures that integers are stored or transmitted in a predictable and interoperable format, especially when communicating between systems with different native endianness (e.g., little-endian vs. big-endian).
• Representing the checksum in a binary format ensures efficient storage and fast network transmission.
  binary.LittleEndian.PutUint32(lengthBytes, dataLen)