Dynamic membership management in a distributed system
First Claim
1. A method for dynamically managing persistent membership of a coordination group in a distributed environment, the coordination group including a number of sites included in a persistent membership, with one or more of the sites including a database and a registrar, the method comprising:
- sending, by an entrant seeking to become a member of the persisted membership, a Membership Request;
receiving, by a registrar that is a member of the persistent membership, the Membership Request;
modifying, by the registrar, the persistent membership for the entrant;
disconnecting, by the registrar, from the coordination group; and
initializing a database for the entrant.
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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.
70 Citations
20 Claims
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1. A method for dynamically managing persistent membership of a coordination group in a distributed environment, the coordination group including a number of sites included in a persistent membership, with one or more of the sites including a database and a registrar, the method comprising:
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sending, by an entrant seeking to become a member of the persisted membership, a Membership Request;
receiving, by a registrar that is a member of the persistent membership, the Membership Request;
modifying, by the registrar, the persistent membership for the entrant;
disconnecting, by the registrar, from the coordination group; and
initializing a database for the entrant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for dynamically managing persistent membership of a coordination group in a distributed environment, the coordination group including a number of sites included in a persistent membership, with one or more of the sites including a database and a registrar, the method comprising:
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sending, by an entrant seeking to become a member of the persisted membership, a Membership Request;
receiving, by a registrar that is a member of the persistent membership, the Membership Request;
sending, by the registrar, a Membership Change message to other sites in the coordination group so that the Membership Change message can be persisted and totally ordered;
receiving, by the registrar, the Membership Change message in total persisted order from the coordination group;
disconnecting, by the registrar, from the coordination group;
initializing a database for the entrant;
reconnecting, by the registrar, to the coordination group after initialization of the entrant database; and
connecting, by the entrant, to the coordination group after initialization of the entrant database.
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17. A machine-readable medium encoded with instructions, that when executed by one or more processors, cause the processor to carry out a process for dynamically managing persistent membership of a coordination group in a distributed environment, the coordination group including a number of sites included in a persistent membership, with one or more of the sites including a database and a registrar, the process comprising:
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sending, by an entrant seeking to become a member of the persisted membership, a Membership Request;
receiving, by a registrar that is a member of the persistent membership, the Membership Request;
modifying, by the registrar, the persistent membership for the entrant;
disconnecting, by the registrar, from the coordination group;
initializing a database for the entrant;
reconnecting, by the registrar, to the coordination group after initialization of the entrant database; and
connecting, by the entrant, to the coordination group after initialization of the entrant database. - View Dependent Claims (18, 19, 20)
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Specification