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2 phase commit for Distributed Transaction management in microservices | Code Decode |

In this microservice Interview questions and answers for 2 phase commit for distributed transaction management in microservices. Udemy Course discounted link https://www.udemy.com/course/master-s... Mock Interview Invitation form : https://forms.gle/wHnipR1FWrEDaexGA *Two-Phase Commit (2 PC)* 2 Phase Commit is a standard protocol to handle distributed transactions using 2 stages namely *Prepare stage and the Commit stage.* There is a transaction coordinator component that coordinates the entire transaction by talking to all the services consider three microservices: Order Service, Payment Service, and Inventory Service. 1. *Transaction Initiation (Coordinator):* - The Order Service receives a request to place an order and initiates a transaction. - The Order Service acts as the coordinator for the transaction. 2. *Voting Phase (Prepare Phase):* - The Order Service sends a prepare message to all participating microservices, including the Payment Service and Inventory Service. - Each participating microservice (Payment Service, Inventory Service) checks whether it can fulfill its part of the transaction. If everything is in order, they reply with a vote "Yes." Otherwise, they reply with a vote "No." 3. *Decision Phase (Commit or Abort):* - If all microservices voted "Yes," the Order Service sends a commit message to all participating microservices. - If any microservice voted "No," the Order Service sends an abort message to all participating microservices. 4. *Commit Phase:* - If the decision is to commit, all participating microservices (Order Service, Payment Service, Inventory Service) execute the actual changes needed to fulfill the transaction. - For example, the Order Service records the order, the Payment Service processes the payment, and the Inventory Service updates the available inventory. 5. *Acknowledgment Phase:* - After successful execution, each microservice sends an acknowledgment back to the Order Service. 6. *Completion:* - If all acknowledgments are received, the Order Service considers the transaction complete and sends a response to the client indicating success. - If any acknowledgment is missing or if any microservice encountered an issue during execution, the Order Service can initiate compensation actions or notify the client of a failure. *Drawbacks of 2PC* *Coordination Overhead:* - 2PC involves a significant amount of coordination between the coordinator and participants. The need for multiple rounds of communication and synchronization can introduce overhead, impacting the overall system performance and scalability. *Single Point of Failure:* - The coordinator acts as a single point of failure. If the coordinator fails after participants have committed changes but before it sends the final commit message, the system can be left in an inconsistent state *Blocking:* - One of the major drawbacks of 2PC is its blocking nature. During the protocol execution, all participants are blocked from processing other transactions until a final decision (commit or abort) is reached. - If someone has a problem during this process, like a technical issue or a disagreement, everyone has to wait until the issue is resolved or the decision is made to cancel the entire transaction. *Blocking during Coordinator Failure:* - If the coordinator fails after sending the commit message but before participants receive it, participants might be left uncertain about the final decision. In this case, participants can independently decide to commit or abort based on a timeout. If they don't receive a coordinator's message within a certain time frame, they may choose to abort and roll back changes. Hence came 3 PC to rectify some disadvantages. Core Java Interview Questions and Answers:    • Core Java frequently asked Interview ...   Advance Java Interview Questions and Answers:    • Advance Java Interview Questions   Java 8 Interview Questions and Answers:    • Java 8 Interview Questions(New Features)   Hibernate Interview Questions and Answers:    • Hibernate Interview Questions Java   Spring Boot Interview Questions and Answers:    • Advance Java Interview Questions   Angular Playlist:    • Angular Course Introduction || Angular 8   SQL Playlist:    • SQL Interview Questions and Answers   GIT:    • GIT   Subscriber and Follow Code Decode Subscriber Code Decode: https://www.youtube.com/c/CodeDecode?... LinkedIn :   / codedecodeyoutube   Instagram:   / codedecode25   #2phasecommit #codedecode #microservices