Package com.hazelcast.config

Class ProbabilisticSplitBrainProtectionConfigBuilder

  • public class ProbabilisticSplitBrainProtectionConfigBuilder
extends SplitBrainProtectionConfigBuilder
    Builder for a SplitBrainProtectionConfig configured with ProbabilisticSplitBrainProtectionFunction that considers members present in the context of a split brain protection using a probabilistic, adaptive split brain protection function.

    • Field Detail

      • DEFAULT_PHI_THRESHOLD

        public static final double DEFAULT_PHI_THRESHOLD
        Default threshold for suspicion (φ) level.

      • DEFAULT_SAMPLE_SIZE

        public static final int DEFAULT_SAMPLE_SIZE
        Default number of samples to use for calculation of mean and standard deviation of inter-arrival times.

      • DEFAULT_MIN_STD_DEVIATION

        public static final long DEFAULT_MIN_STD_DEVIATION
        Default minimum standard deviation (in milliseconds) to use for the normal distribution used when calculating phi.

      • DEFAULT_HEARTBEAT_PAUSE_MILLIS

        public static final long DEFAULT_HEARTBEAT_PAUSE_MILLIS
        Default duration in milliseconds corresponding to number of potentially lost/delayed heartbeats that will be accepted before considering it to be an anomaly.

      • DEFAULT_HEARTBEAT_INTERVAL_MILLIS

        public static final long DEFAULT_HEARTBEAT_INTERVAL_MILLIS
        Default value of heartbeat interval (in milliseconds).

    • Method Detail

      • withSuspicionThreshold

        public ProbabilisticSplitBrainProtectionConfigBuilder withSuspicionThreshold​(double suspicionThreshold)
        Threshold for suspicion (φ) level. A low threshold is prone to generate many wrong suspicions but ensures a quick detection in the event of a real crash. Conversely, a high threshold generates fewer mistakes but needs more time to detect actual crashes.

      • withMinStdDeviationMillis

        public ProbabilisticSplitBrainProtectionConfigBuilder withMinStdDeviationMillis​(long minStdDeviationMillis)
        Minimum standard deviation (in milliseconds) to use for the normal distribution used when calculating phi. Too low standard deviation might result in too much sensitivity for sudden, but normal, deviations in heartbeat inter arrival times.

      • withAcceptableHeartbeatPauseMillis

        public ProbabilisticSplitBrainProtectionConfigBuilder withAcceptableHeartbeatPauseMillis​(long acceptableHeartbeatPauseMillis)
        Duration in milliseconds corresponding to number of potentially lost/delayed heartbeats that will be accepted before considering it to be an anomaly. This margin is important to be able to survive sudden, occasional, pauses in heartbeat arrivals, due to for example garbage collection or network drops.

      • withHeartbeatIntervalMillis

        public ProbabilisticSplitBrainProtectionConfigBuilder withHeartbeatIntervalMillis​(long heartbeatIntervalMillis)
        Bootstrap the stats with heartbeats that corresponds to this duration in milliseconds, with a rather high standard deviation (since environment is unknown in the beginning).