Method for adding new members to a group by sending a commit message with updated membership list to all nodes on the updated list
First Claim
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1. A method for adding new members to a group of nodes in a connected data processing network, said method comprising the steps of:
- periodically sending, from a first group leader node a proclaim message to select nodes in the network configuration but which are not currently part of the group;
responding to said proclaim message from said first group leader node with a join message from a group leader of an other group having said lower network address, said join message including a membership list for any joining groups;
transmitting a prepare-to-commit message to said nodes within any of said joining groups;
receiving, at said first group leader node, an acknowledgment of said prepare to commit message, from at least one node;
sending a commit message with updated membership list to all nodes on the updated list;
following said periodic sending, determining that a specified number of said prepare-to-commit message transmissions have not been received from a potentially failed node; and
sending an echo-request message to said potentially failed node, said echo request message being directed to an other program running on said potentially failed node that is less susceptible than said prepare-to-commit message to being delayed.
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Abstract
The determination of node and/or adapter liveness in a distributed network data processing system is carried out via one messaging protocol that can be assisted by a second messaging protocol which is significantly less susceptible to delay, especially memory blocking delays encountered by daemons running on other nodes. The switching of protocols is accompanied by controlled grace periods for needed responses. This messaging protocol flexibility is also adapted for use as a mechanism for controlling the deliberate activities of node addition (birth) and node deletion (death).
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Citations
8 Claims
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1. A method for adding new members to a group of nodes in a connected data processing network, said method comprising the steps of:
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periodically sending, from a first group leader node a proclaim message to select nodes in the network configuration but which are not currently part of the group; responding to said proclaim message from said first group leader node with a join message from a group leader of an other group having said lower network address, said join message including a membership list for any joining groups; transmitting a prepare-to-commit message to said nodes within any of said joining groups; receiving, at said first group leader node, an acknowledgment of said prepare to commit message, from at least one node; sending a commit message with updated membership list to all nodes on the updated list; following said periodic sending, determining that a specified number of said prepare-to-commit message transmissions have not been received from a potentially failed node; and sending an echo-request message to said potentially failed node, said echo request message being directed to an other program running on said potentially failed node that is less susceptible than said prepare-to-commit message to being delayed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification