ai.eloquent.raft

Class UnsatisfiableQuorumFailsafe

java.lang.Object

ai.eloquent.raft.UnsatisfiableQuorumFailsafe

All Implemented Interfaces:

RaftFailsafe

public class UnsatisfiableQuorumFailsafe
extends java.lang.Object
implements RaftFailsafe

This failsafe checks for the following very specific condition: - 1. We believe we're the leader - 2. There are other members in our cluster config - 3. It has been more than 30 seconds since we got messages from any other cluster member - 4. We can confirm with Kubernetes that none of the other cluster members we think we have are still alive In that case, we go ahead and commit the change to the cluster that all the other cluster members are dead, so we can proceed.

Field Summary

Fields

Modifier and Type	Field and Description
long	timeout The timeout, in milliseconds, after which the failsafe should trigger.

Constructor Summary

Constructors

Constructor and Description
UnsatisfiableQuorumFailsafe(java.time.Duration timeout) Create a new failsafe from the default Kubernetes state in UDPTransport.readKubernetesState().
UnsatisfiableQuorumFailsafe(IOSupplier<java.lang.String[]> getClusterState, java.time.Duration timeout) Create a new failsafe from the given cluster state provider.

Method Summary

Modifier and Type	Method and Description
void	heartbeat(RaftAlgorithm algorithm, long now) This gets called every heartbeat from an EloquentRaftAlgorithm where this failsafe is registered.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

timeout

public final long timeout

The timeout, in milliseconds, after which the failsafe should trigger. A sensible default if you're using EloquentRaftAlgorithm is EloquentRaftAlgorithm.MACHINE_DOWN_TIMEOUT + 15s

Constructor Detail

UnsatisfiableQuorumFailsafe

public UnsatisfiableQuorumFailsafe(java.time.Duration timeout)

Create a new failsafe from the default Kubernetes state in UDPTransport.readKubernetesState().

UnsatisfiableQuorumFailsafe

public UnsatisfiableQuorumFailsafe(IOSupplier<java.lang.String[]> getClusterState,
                                   java.time.Duration timeout)

Create a new failsafe from the given cluster state provider.

Method Detail

heartbeat

public void heartbeat(RaftAlgorithm algorithm,
                      long now)

This gets called every heartbeat from an EloquentRaftAlgorithm where this failsafe is registered.

Specified by:

heartbeat in interface RaftFailsafe

Parameters:

algorithm - the calling algorithm

now - the current time