kafka.controller

PartitionStateMachine

class PartitionStateMachine extends Logging

This class represents the state machine for partitions. It defines the states that a partition can be in, and transitions to move the partition to another legal state. The different states that a partition can be in are - 1. NonExistentPartition: This state indicates that the partition was either never created or was created and then deleted. Valid previous state, if one exists, is OfflinePartition 2. NewPartition : After creation, the partition is in the NewPartition state. In this state, the partition should have replicas assigned to it, but no leader/isr yet. Valid previous states are NonExistentPartition 3. OnlinePartition : Once a leader is elected for a partition, it is in the OnlinePartition state. Valid previous states are NewPartition/OfflinePartition 4. OfflinePartition : If, after successful leader election, the leader for partition dies, then the partition moves to the OfflinePartition state. Valid previous states are NewPartition/OnlinePartition

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Instance Constructors

  1. new PartitionStateMachine(controller: KafkaController)

Type Members

  1. class AddPartitionsListener extends IZkDataListener with Logging

  2. class TopicChangeListener extends IZkChildListener with Logging

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

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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  4. final def ==(arg0: AnyRef): Boolean

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  5. final def ==(arg0: Any): Boolean

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  6. final def asInstanceOf[T0]: T0

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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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  10. def debug(e: ⇒ Throwable): Any

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  11. def debug(msg: ⇒ String): Unit

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  12. def electLeaderForPartition(topic: String, partition: Int, leaderSelector: PartitionLeaderSelector): Unit

    Invoked on the OfflinePartition->OnlinePartition state change.

    Invoked on the OfflinePartition->OnlinePartition state change. It invokes the leader election API to elect a leader for the input offline partition

    topic

    The topic of the offline partition

    partition

    The offline partition

    leaderSelector

    Specific leader selector (e.g., offline/reassigned/etc.)

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

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  14. def equals(arg0: Any): Boolean

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

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  16. def error(e: ⇒ Throwable): Any

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  17. def error(msg: ⇒ String): Unit

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

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  19. def fatal(e: ⇒ Throwable): Any

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  20. def fatal(msg: ⇒ String): Unit

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  21. def finalize(): Unit

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

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  23. def handleStateChanges(partitions: Set[TopicAndPartition], targetState: PartitionState, leaderSelector: PartitionLeaderSelector = noOpPartitionLeaderSelector): Unit

    This API is invoked by the partition change zookeeper listener

    This API is invoked by the partition change zookeeper listener

    partitions

    The list of partitions that need to be transitioned to the target state

    targetState

    The state that the partitions should be moved to

  24. def hashCode(): Int

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

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  26. def info(e: ⇒ Throwable): Any

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  27. def info(msg: ⇒ String): Unit

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  28. final def isInstanceOf[T0]: Boolean

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  29. var logIdent: String

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  30. lazy val logger: Logger

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  31. val loggerName: String

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

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  33. final def notify(): Unit

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  34. final def notifyAll(): Unit

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  35. var partitionState: Map[TopicAndPartition, PartitionState]

  36. def registerListeners(): Unit

  37. def registerPartitionChangeListener(topic: String): Unit

  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 topic change listener since that triggers all state transitions for partitions. Initializes the state of partitions by reading from zookeeper. Then triggers the OnlinePartition state change for all new or offline partitions.

  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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  46. final def synchronized[T0](arg0: ⇒ T0): T0

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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. def triggerOnlinePartitionStateChange(): Unit

    This API invokes the OnlinePartition state change on all partitions in either the NewPartition or OfflinePartition state.

    This API invokes the OnlinePartition state change on all partitions in either the NewPartition or OfflinePartition state. This is called on a successful controller election and on broker changes

  52. final def wait(): Unit

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

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

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

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  56. def warn(e: ⇒ Throwable): Any

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  57. def warn(msg: ⇒ String): Unit

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