Dynamic membership management in a distributed system
First Claim
1. A method comprising:
- determining, using one or more processors, individual weights associated with individual persistent members of a coordination group in a previous quorum;
determining, using one or more processors, that a current quorum is attained based on an algorithm using the individual weights associated with the individual persistent members of the coordination group in the previous quorum;
determining, using one or more processors, whether a first site that is a persistent member of the coordination group has participated in at least one quorum prior to the current quorum; and
responsive to determining that the first site has participated in at least one quorum prior to the current quorum, a registrar of the first site modifying the persistent membership of the coordination group, the coordination group including a number of sites in a distributed environment and including the first site.
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Accused Products
Abstract
Transactional database replication techniques are disclosed that do not require altering of the database management system implementation. A replicator module includes a dynamic membership manager, which is configured to manage the persistent membership of a coordination group. The persistent membership can be, for example, a durable set of sites that can replicate changes amongst themselves. Changes from sites not in the persistent membership are discarded. The set of recovered members is a subset of the persistent membership. The persistent membership changes incrementally by either removing or adding members. Failed members may still be part of the persistent membership. The dynamic membership manager module manages the modification of the persistent membership, initialization of replicas, and propagation of membership information.
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Citations
19 Claims
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1. A method comprising:
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determining, using one or more processors, individual weights associated with individual persistent members of a coordination group in a previous quorum; determining, using one or more processors, that a current quorum is attained based on an algorithm using the individual weights associated with the individual persistent members of the coordination group in the previous quorum; determining, using one or more processors, whether a first site that is a persistent member of the coordination group has participated in at least one quorum prior to the current quorum; and responsive to determining that the first site has participated in at least one quorum prior to the current quorum, a registrar of the first site modifying the persistent membership of the coordination group, the coordination group including a number of sites in a distributed environment and including the first site. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A non-transitory computer-readable medium encoded with instructions that, when executed by one or more processors, causes the one or more processors to carry out a process comprising:
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determining, using one or more processors, individual weights associated with individual persistent members of a coordination group in a previous quorum; determining that a current quorum is attained based on an algorithm using the individual weights associated with the individual persistent members of the coordination group in the previous quorum; determining whether a first site that is a persistent member of the coordination group has participated in at least one quorum prior to the current quorum; and responsive to determining that the first site has participated in at least one quorum prior to the current quorum, a registrar of the first site modifying the persistent membership of the coordination group, the coordination group including a number of sites in a distributed environment and including the first site. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A system comprising:
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a processor; and a memory storing instructions that, when executed, cause the system to; determine individual weights associated with individual persistent members of a coordination group in a previous quorum; determine that a current quorum is attained based on an algorithm using the individual weights associated with the individual persistent members of the coordination group in the previous quorum; determine whether a first site that is a persistent member of the coordination group has participated in at least one quorum prior to the current quorum; and responsive to determining that the first site has participated in at least one quorum prior to the current quorum, a registrar of the first site modifying the persistent membership of the coordination group, the coordination group including a number of sites in a distributed environment and including the first site.
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Specification