org.apache.hadoop.hbase.namequeues

Interface NamedQueueService

All Known Implementing Classes:

BalancerDecisionQueueService, BalancerRejectionQueueService, SlowLogQueueService

@InterfaceAudience.Private
public interface NamedQueueService

In-memory Queue service provider for multiple use-cases. Implementers should be registered in LogEventHandler

Method Summary

Modifier and Type	Method and Description
boolean	clearNamedQueue() Cleans up queues maintained by services.
void	consumeEventFromDisruptor(NamedQueuePayload namedQueuePayload) This implementation is generic for consuming records from LMAX disruptor and inserts records to EvictingQueue which is maintained by each ringbuffer provider.
NamedQueuePayload.NamedQueueEvent	getEvent() Retrieve event type for NamedQueueService implementation.
NamedQueueGetResponse	getNamedQueueRecords(NamedQueueGetRequest request) Retrieve in memory queue records from ringbuffer
void	persistAll() Add all in memory queue records to system table.

Method Detail

getEvent

NamedQueuePayload.NamedQueueEvent getEvent()

Retrieve event type for NamedQueueService implementation.

Returns:

NamedQueuePayload.NamedQueueEvent

consumeEventFromDisruptor

void consumeEventFromDisruptor(NamedQueuePayload namedQueuePayload)

This implementation is generic for consuming records from LMAX disruptor and inserts records to EvictingQueue which is maintained by each ringbuffer provider.

Parameters:

namedQueuePayload - namedQueue payload from disruptor ring buffer

clearNamedQueue

boolean clearNamedQueue()

Cleans up queues maintained by services.

Returns:

true if slow log payloads are cleaned up, false otherwise

getNamedQueueRecords

NamedQueueGetResponse getNamedQueueRecords(NamedQueueGetRequest request)

Retrieve in memory queue records from ringbuffer

Parameters:

request - namedQueue request with event type

Returns:

queue records from ringbuffer after filter (if applied)

persistAll

void persistAll()

Add all in memory queue records to system table. The implementors can use system table or direct HDFS file or ZK as persistence system.