DIZNR INTERNATIONAL

LOGICAL CLOCK IN DISTRIBUTED SYSTEM HAPPENED BEFORE CLOCK CLOCK SYNC CLOCK VECTOR

Logical Clock in Distributed System Happened Before Clock Clock Sync Clock Vector

Logical Clock in Distributed System Happened Before Clock Clock Sync Clock Vector

LOGICAL CLOCK IN DISTRIBUTED SYSTEM HAPPENED BEFORE CLOCK CLOCK SYNC CLOCK VECTOR.

Distributed Systems Physical Clocks Logical Clocks Vector Clocks Synchronize Physical Clocks Logical Time Happened Before Clocks Linear Time Distributed Systems Physical Clocks Logical Clocks Vector Clocks.

https://www.gyanodhan.com/video/7A2.%20Computer%20Science/Distributed%20Computing/322.%20Day%2003%20Part%2001%20Logical%20Clock%20In%20Distributed%20System%20Happened%20Before%20Clock%20clock%20syncclock%20vector.mp4

Synchronize Physical Clocks Logical Time Happened Before Linear Time Time Ordering Module Vector Clock Vs Lamport Clock Logical Clock In Distributed System What Is Global Clock In Distributed System. Vector Clock In Distributed System Types Of Clocks In Distributed System Physical Clocks Logical Clocks Vector Clocks Synchronize Physical Clocks Logical Time Happened Before Linear Time Time Ordering Module Vector Clock Vs Lamport Clock. Logical Clock in Distributed System. What Is Global Clock In Distributed System Vector Clock In Distributed System Types Of Clocks In Distributed System Time Ordering Module. Vector Clock Vs Lamport Clock Logical Clock In Distributed System What Is Global Clock In Distributed System Vector Clock In Distributed System Types Of Clocks In Distributed System.

Here’s a clear and concise explanation of Logical Clocks in Distributed Systems, including concepts like Happened-Before Relation, Lamport Clock, Vector Clock, and Clock Synchronization.


LOGICAL CLOCK IN DISTRIBUTED SYSTEMS

In distributed systems, there’s no global clock. So, we use logical clocks to order events correctly across multiple processes (nodes).


1. Happened-Before Relation (β†’) – by Leslie Lamport

This defines a partial order of events.

Definition:

Purpose: Establish a cause-effect relationship between events in different processes.


2. Lamport’s Logical Clock (Scalar Clock)

Goal: Assign numbers (timestamps) to events to maintain A β†’ B β‡’ timestamp(A) < timestamp(B)

Rules:

  1. Each process maintains a local clock (initially 0).

  2. Before executing any event, increment the clock: C := C + 1

  3. When sending a message, send timestamp with it.

  4. On receiving a message with timestamp T, set:
    C := max(C, T) + 1

Limitation:


3. Vector Clocks

Goal: Detect causal relationships and concurrent events accurately.

How it works:

Comparison:


4. Clock Synchronization

Since there’s no common clock:

These aim to reduce clock drift and keep system-wide time in sync, though not perfect.


Summary Table

Concept Purpose Can Detect Concurrency? Type
Happened-Before Partial ordering of events Yes Theory
Lamport Clock Order events logically No Scalar
Vector Clock Track causality + concurrency Yes Vector
Clock Sync (NTP) Sync real-time clocks Not logical ordering Physical

Real-World Use


Would you like:

Let me know!

LOGICAL CLOCK IN DISTRIBUTED SYSTEM HAPPENED BEFORE CLOCK CLOCK SYNC CLOCK VECTOR

Clocks in Distributed System