CheckpointStore

To create an implemetation of CheckpointState you need first define a class of CheckpointStore see com.twitter.summingbird.batch.state.HDFSCheckpointStore for an example

Subclass of CheckpointStore should be responsible for getting the startBatch by checking the checkpoints of previous batch run and getting the endBatch by number of batches the clients asks to run.

The CheckpointStore should provide concrete implementation of how to read previous batch and checkpoint current batch

Type T is the token of each batch run created by startBatch(), the token is then provided back to checkPoint store for checkpoint Success or Failure.

Source: CheckpointState.scala

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Known Subclasses

HDFSCheckpointStore

Abstract Value Members

abstract def batcher: Batcher
abstract def checkpointBatchStart(intersection: Intersection[InclusiveLower, ExclusiveUpper, Timestamp]): T

is called when the batch is started.
is called when the batch is started. notice the intersection is not necessarily the same as [startBatch..endBatch), since there could be only part of the data available given a requested time range. It returns a batch token of typ T, which will be provided when the job is completed or failed for checkpointing.
abstract def checkpointFailure(batchToken: T, err: Throwable): Unit

is called when the scalding job failed
abstract def checkpointPlanFailure(err: Throwable): Unit

is called when the planning is failed to start the scalding job
abstract def checkpointSuccessfulRun(batchToken: T): Unit

is called when the batches are finished successfully
abstract def endBatch: ExclusiveUpper[BatchID]

usually it's startBatch + numBatchesToRun, it's used to calculate requested time interval for the job
abstract def startBatch: InclusiveLower[BatchID]

should get startBatch by checking the previous batch run, it's used to calculate requested time interval for the job

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trait CheckpointStore[T] extends AnyRef

Abstract Value Members

abstract def batcher: Batcher

abstract def checkpointBatchStart(intersection: Intersection[InclusiveLower, ExclusiveUpper, Timestamp]): T

abstract def checkpointFailure(batchToken: T, err: Throwable): Unit

abstract def checkpointPlanFailure(err: Throwable): Unit

abstract def checkpointSuccessfulRun(batchToken: T): Unit

abstract def endBatch: ExclusiveUpper[BatchID]

abstract def startBatch: InclusiveLower[BatchID]

Concrete Value Members

final def !=(arg0: AnyRef): Boolean

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: AnyRef): Boolean

final def ==(arg0: Any): Boolean

final def asInstanceOf[T0]: T0

def clone(): AnyRef

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

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

def toString(): String

final def wait(): Unit

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

final def wait(arg0: Long): Unit

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