Package org.apache.cassandra.locator

Interface DynamicEndpointSnitchMBean

All Known Implementing Classes:
DynamicEndpointSnitch
public interface DynamicEndpointSnitchMBean

  • Method Details

    • getScoresWithPort

      Map<String,Double> getScoresWithPort()

    • getScores

      @Deprecated(since="4.0") Map<InetAddress,Double> getScores()
      Deprecated.
      See CASSANDRA-7544

    • getUpdateInterval

      int getUpdateInterval()

    • getResetInterval

      int getResetInterval()

    • getBadnessThreshold

      double getBadnessThreshold()

    • getSubsnitchClassName

      String getSubsnitchClassName()

    • dumpTimings

      List<Double> dumpTimings(String hostname) throws UnknownHostException
      Throws:
      UnknownHostException

    • setSeverity

      void setSeverity(double severity)
      Setting a Severity allows operators to inject preference information into the Dynamic Snitch replica selection. When choosing which replicas to participate in a read request, the DSnitch sorts replicas by response latency, and selects the fastest replicas. Latencies are normalized to a score from 0 to 1, with lower scores being faster. The Severity injected here will be added to the normalized score. Thus, adding a Severity greater than 1 will mean the replica will never be contacted (unless needed for ALL or if it is added later for rapid read protection). Conversely, adding a negative Severity means the replica will *always* be contacted. (The "Severity" term is historical and dates to when this was used to represent how badly background tasks like compaction were affecting a replica's performance. See CASSANDRA-3722 for when this was introduced and CASSANDRA-11738 for why it was removed.)

    • getSeverity

      double getSeverity()
      Returns:
      the current manually injected Severity.