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Mutual Exclusion Problems In Bully Algorithm

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OPTIMIZED BULLY ALGORITHM

Sathesh B.M
Programmer Analyst,
Cognizant Technology Solutions,
Chennai, India satheshbm92@gmail.com ABSTRACT

All distributed systems require one process to act as a coordinator , initiator or otherwise perform some special role .In general , it does not matter which process takes on this special responsibility , but one of them has to do it . The goal of an election algorithm is to ensure that when an election starts, it concludes with all processes agreeing on who the new coordinator is to be. Bully Algorithm by Garcia-Molina is a classic algorithm for leader election in a distributed system. Although the already existing algorithm solves the purpose, the traditional bully algorithm takes lot of message …show more content…
1.2 Mutual Exclusion
One of the important problems in distributed systems is mutual exclusion. The mutual exclusion problem states that only a single process is allowed to access to a protected resource, also termed as a critical section (CS), at any point of time. One of the approaches for solving this problem is centralized algorithm. In this approach one process is elected as the coordinator (e.g., the one running on the machine with the highest network address). Whenever a process wants to enter a critical section, it sends a request message to the coordinator and asking for permission. If no process is currently in the critical section, the coordinator sends back a reply granting permission and when the reply arrives, the requesting process enters the critical section. Providing access to this critical section is the purpose of the coordinator node and it will be further emphasized in remainder of the …show more content…
Number of messages is calculated by the following equation, in this regard n is the number of processes in the distributed system and ID is the identifier of the process that has noticed a coordinator crash and run the bully algorithm.
2.2 No method for recovery
The bully election algorithm does not say what to do when a crashed leader recovers. Not only bully election algorithm, all the election algorithm does not care about the crashed leader, when the leader is crashed new leader is elected and the crashed leader is not considered for the new election. By some means if the crashed leader recovers itself , we need to include it also in the election .This is a major drawback in the bully election algorithm and even other election algorithms do not address this issue. We are suggesting an alternate method to overcome this drawback.
3. Proposed

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