public static class NullImplementation.NullPartitionAssignmentStrategy extends Object implements PartitionAssignmentStrategy
PartitionAssignmentStrategy
that does nothing.Modifier and Type | Field and Description |
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static NullImplementation.NullPartitionAssignmentStrategy |
INSTANCE
Singleton instance.
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Constructor and Description |
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NullPartitionAssignmentStrategy() |
Modifier and Type | Method and Description |
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long |
analyzeDistribution()
Analyze the distribution and return the desired time interval before the next distribution analysis.
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void |
analyzeOrphans(Map<Member,PartitionSet> mapConstraints)
Analyze and suggest the assignment of orphaned partitions (partitions without an active primary or backup owner) subject to the specified constraints.
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String |
getDescription()
Return a human-readable description of the state of the partition assignment.
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void |
init(DistributionManager manager)
Initialize the PartitionAssignmentStrategy and bind it to the specified DistributionManager.
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public static final NullImplementation.NullPartitionAssignmentStrategy INSTANCE
public void init(DistributionManager manager)
analysis
.init
in interface PartitionAssignmentStrategy
manager
- the DistributionManager that this strategy is bound topublic void analyzeOrphans(Map<Member,PartitionSet> mapConstraints)
The strategy must provide suggestions for all orphaned partitions which are consistent with the supplied constraints. Failure to provide a complete set of valid suggestions may result in the loss of partition data.
analyzeOrphans
in interface PartitionAssignmentStrategy
mapConstraints
- the map of assignment constraints associating members with the set of partitions that they could be assigned ownership ofpublic long analyzeDistribution()
As a result of failover, partitions may become 'endangered', meaning that the necessary number of backups do not exist. Failure to suggest a distribution recovery plan for those partitions may result in the partition remaining in the endangered state. Additionally, ownership-enabled service members that are in the process of shutting down will wait until all owned partitions are transferred out. Failure to suggest a distribution plan may delay the exit of these leaving members.
The statistics and ownership information exposed by the DistributionManager will not mutate for the duration of this method call.
analyzeDistribution
in interface PartitionAssignmentStrategy
public String getDescription()
getDescription
in interface PartitionAssignmentStrategy