ml.shifu.guagua.worker
接口 WorkerInterceptor<MASTER_RESULT extends Bytable,WORKER_RESULT extends Bytable>

类型参数：

MASTER_RESULT - master result for computation in each iteration.

WORKER_RESULT - worker result for computation in each iteration.

所有已知实现类：

AbstractWorkerCoordinator, AsyncWorkerCoordinator, BasicWorkerInterceptor, InternalWorkerCoordinator, MemoryStatsWorkerInterceptor, SyncWorkerCoordinator, TraceWorkerInterceptor, WorkerComputableTimer, WorkerTimer

public interface WorkerInterceptor<MASTER_RESULT extends Bytable,WORKER_RESULT extends Bytable>

WorkerInterceptor is a entry point for all services in worker implementation.

You can add your coordinator mechanism by using one WorkerInterceptor; you can also save each iteration result by override WorkerIntercepter#postApplication(MasterContext).

For a list of intercepters, the order to call preXXX methods and postXXX methods is different. For example, a and b two intercepters. The order is a.preApplication->b.preApplication->a.preIteration->b.preIteration->computation->b.postIteration ->a.postIteration->b.postApplication->a.postApplication. This is like call stack to make sure each intercepter to intercept the whole other intercepters and computations.

方法摘要

void	postApplication(WorkerContext<MASTER_RESULT,WORKER_RESULT> context) The hook point for each application or each mapreduce job which is after all iterations completed.
void	postIteration(WorkerContext<MASTER_RESULT,WORKER_RESULT> context) The hook point for each iteration which is after WorkerComputable.compute(WorkerContext).
void	preApplication(WorkerContext<MASTER_RESULT,WORKER_RESULT> context) The hook point for each application or each mapreduce job which is before all iterations started.
void	preIteration(WorkerContext<MASTER_RESULT,WORKER_RESULT> context) The hook point for each iteration which is before WorkerComputable.compute(WorkerContext).

方法详细信息

preApplication

void preApplication(WorkerContext<MASTER_RESULT,WORKER_RESULT> context)

The hook point for each application or each mapreduce job which is before all iterations started.

preIteration

void preIteration(WorkerContext<MASTER_RESULT,WORKER_RESULT> context)

The hook point for each iteration which is before WorkerComputable.compute(WorkerContext).

postIteration

void postIteration(WorkerContext<MASTER_RESULT,WORKER_RESULT> context)

The hook point for each iteration which is after WorkerComputable.compute(WorkerContext).

postApplication

void postApplication(WorkerContext<MASTER_RESULT,WORKER_RESULT> context)

The hook point for each application or each mapreduce job which is after all iterations completed.