org.apache.flink.runtime.jobmaster.event

Interface JobEventStore

All Known Implementing Classes:

FileSystemJobEventStore

public interface JobEventStore

A store for recording the JobEvent.

Method Summary

Modifier and Type	Method and Description
boolean	isEmpty() Returns whether the store is empty.
JobEvent	readEvent() Read a job event.
void	start() Start the store.
void	stop(boolean clearEventLogs) Stop the store.
void	writeEvent(JobEvent jobEvent, boolean cutBlock) Write a job event.

Method Detail

start

void start()
    throws Exception

Start the store. This method should be called before any other operations.

Throws:

Exception

stop

void stop(boolean clearEventLogs)

Stop the store.

Parameters:

clearEventLogs - Whether to clear the job events that have been recorded in the store.

writeEvent

void writeEvent(JobEvent jobEvent,
                boolean cutBlock)

Write a job event.

Parameters:

jobEvent - The job event that will be recorded.

cutBlock - If set to true, the current output file will be closed after writing this event, and a new output file will be created for subsequent events. This parameter effectively controls the segmentation of event data into separate files.

readEvent

JobEvent readEvent()
            throws Exception

Read a job event.

Returns:

job event.

Throws:

Exception

isEmpty

boolean isEmpty()
         throws Exception

Returns whether the store is empty.

Returns:

false if the store contains any job events, true otherwise.

Throws:

Exception