kafka.controller

ReplicaStateMachine

class ReplicaStateMachine extends Logging

This class represents the state machine for replicas. It defines the states that a replica can be in, and transitions to move the replica to another legal state. The different states that a replica can be in are - 1. NewReplica : The controller can create new replicas during partition reassignment. In this state, a replica can only get become follower state change request. Valid previous state is NonExistentReplica 2. OnlineReplica : Once a replica is started and part of the assigned replicas for its partition, it is in this state. In this state, it can get either become leader or become follower state change requests. Valid previous state are NewReplica, OnlineReplica or OfflineReplica 3. OfflineReplica : If a replica dies, it moves to this state. This happens when the broker hosting the replica is down. Valid previous state are NewReplica, OnlineReplica 4. NonExistentReplica: If a replica is deleted, it is moved to this state. Valid previous state is OfflineReplica

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Instance Constructors

  1. new ReplicaStateMachine(controller: KafkaController)

Type Members

  1. class BrokerChangeListener extends IZkChildListener with Logging

    This is the zookeeper listener that triggers all the state transitions for a replica

Value Members

  1. final def !=(arg0: AnyRef): Boolean

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  2. final def !=(arg0: Any): Boolean

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  3. final def ##(): Int

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  7. val brokerRequestBatch: ControllerBrokerRequestBatch

  8. def clone(): AnyRef

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  9. def debug(msg: ⇒ String, e: ⇒ Throwable): Unit

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  11. def debug(msg: ⇒ String): Unit

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  12. final def eq(arg0: AnyRef): Boolean

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  13. def equals(arg0: Any): Boolean

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  14. def error(msg: ⇒ String, e: ⇒ Throwable): Unit

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  15. def error(e: ⇒ Throwable): Any

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  16. def error(msg: ⇒ String): Unit

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  17. def fatal(msg: ⇒ String, e: ⇒ Throwable): Unit

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  18. def fatal(e: ⇒ Throwable): Any

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  19. def fatal(msg: ⇒ String): Unit

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  20. def finalize(): Unit

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  21. final def getClass(): Class[_]

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  22. def getPartitionsAssignedToBroker(topics: Seq[String], brokerId: Int): Seq[TopicAndPartition]

  23. def handleStateChange(topic: String, partition: Int, replicaId: Int, targetState: ReplicaState): Unit

    This API exercises the replica's state machine.

    This API exercises the replica's state machine. It ensures that every state transition happens from a legal previous state to the target state.

    topic

    The topic of the replica for which the state transition is invoked

    partition

    The partition of the replica for which the state transition is invoked

    replicaId

    The replica for which the state transition is invoked

    targetState

    The end state that the replica should be moved to

  24. def handleStateChanges(replicas: Set[PartitionAndReplica], targetState: ReplicaState): Unit

    This API is invoked by the broker change controller callbacks and the startup API of the state machine

    This API is invoked by the broker change controller callbacks and the startup API of the state machine

    replicas

    The list of replicas (brokers) that need to be transitioned to the target state

    targetState

    The state that the replicas should be moved to The controller's allLeaders cache should have been updated before this

  25. def hashCode(): Int

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  26. def info(msg: ⇒ String, e: ⇒ Throwable): Unit

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  27. def info(e: ⇒ Throwable): Any

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  28. def info(msg: ⇒ String): Unit

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  29. final def isInstanceOf[T0]: Boolean

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  30. var logIdent: String

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  31. lazy val logger: Logger

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  32. val loggerName: String

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  33. final def ne(arg0: AnyRef): Boolean

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  34. final def notify(): Unit

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  35. final def notifyAll(): Unit

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  36. def registerListeners(): Unit

  37. var replicaState: Map[(String, Int, Int), ReplicaState]

  38. def shutdown(): Unit

    Invoked on controller shutdown.

  39. def startup(): Unit

    Invoked on successful controller election.

    Invoked on successful controller election. First registers a broker change listener since that triggers all state transitions for replicas. Initializes the state of replicas for all partitions by reading from zookeeper. Then triggers the OnlineReplica state change for all replicas.

  40. def swallow(action: ⇒ Unit): Unit

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  41. def swallowDebug(action: ⇒ Unit): Unit

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  42. def swallowError(action: ⇒ Unit): Unit

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  43. def swallowInfo(action: ⇒ Unit): Unit

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  44. def swallowTrace(action: ⇒ Unit): Unit

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  45. def swallowWarn(action: ⇒ Unit): Unit

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  47. def toString(): String

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  48. def trace(msg: ⇒ String, e: ⇒ Throwable): Unit

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  49. def trace(e: ⇒ Throwable): Any

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  50. def trace(msg: ⇒ String): Unit

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  51. final def wait(): Unit

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  52. final def wait(arg0: Long, arg1: Int): Unit

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  53. final def wait(arg0: Long): Unit

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  54. def warn(msg: ⇒ String, e: ⇒ Throwable): Unit

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  55. def warn(e: ⇒ Throwable): Any

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  56. def warn(msg: ⇒ String): Unit

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