org.apache.hadoop.hbase.coordination

Interface SplitLogWorkerCoordination

All Known Implementing Classes:

ZkSplitLogWorkerCoordination

@InterfaceAudience.Private
public interface SplitLogWorkerCoordination

Coordinated operations for SplitLogWorker and WALSplitterHandler Important methods for SplitLogWorker:
isReady() called from SplitLogWorker.run() to check whether the coordination is ready to supply the tasks
taskLoop() loop for new tasks until the worker is stopped
isStop() a flag indicates whether worker should finish
registerListener() called from SplitLogWorker.run() and could register listener for external changes in coordination (if required)
endTask(SplitLogTask, LongAdder, SplitTaskDetails) notify coordination engine that

Important methods for WALSplitterHandler:
splitting task has completed.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	SplitLogWorkerCoordination.SplitTaskDetails Interface for log-split tasks Used to carry implementation details in encapsulated way through Handlers to the coordination API.

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_MAX_SPLITTERS

Method Summary

Modifier and Type	Method and Description
void	endTask(SplitLogTask slt, LongAdder ctr, SplitLogWorkerCoordination.SplitTaskDetails splitTaskDetails) Notify coordination engine that splitting task has completed.
int	getTaskReadySeq() Used by unit tests to check how many tasks were processed
void	init(RegionServerServices server, org.apache.hadoop.conf.Configuration conf, SplitLogWorker.TaskExecutor splitTaskExecutor, SplitLogWorker worker) Initialize internal values.
boolean	isReady() Check whether the log splitter is ready to supply tasks
boolean	isStop()
void	markCorrupted(org.apache.hadoop.fs.Path rootDir, String name, org.apache.hadoop.fs.FileSystem fs) marks log file as corrupted
void	registerListener() set the listener for task changes.
void	removeListener() remove the listener for task changes.
void	stopProcessingTasks() called when Coordination should stop processing tasks and exit
void	taskLoop() Wait for the new tasks and grab one

Field Detail

DEFAULT_MAX_SPLITTERS

static final int DEFAULT_MAX_SPLITTERS

See Also:

Constant Field Values

Method Detail

init

void init(RegionServerServices server,
          org.apache.hadoop.conf.Configuration conf,
          SplitLogWorker.TaskExecutor splitTaskExecutor,
          SplitLogWorker worker)

Initialize internal values. This method should be used when corresponding SplitLogWorker instance is created

Parameters:

server - instance of RegionServerServices to work with

conf - is current configuration.

splitTaskExecutor - split executor from SplitLogWorker

worker - instance of SplitLogWorker

stopProcessingTasks

void stopProcessingTasks()

called when Coordination should stop processing tasks and exit

isStop

boolean isStop()

Returns:

the current value of exitWorker

taskLoop

void taskLoop()
       throws InterruptedException

Wait for the new tasks and grab one

Throws:

InterruptedException - if the SplitLogWorker was stopped

markCorrupted

void markCorrupted(org.apache.hadoop.fs.Path rootDir,
                   String name,
                   org.apache.hadoop.fs.FileSystem fs)

marks log file as corrupted

Parameters:

rootDir - where to find the log

name - of the log

fs - file system

isReady

boolean isReady()
         throws InterruptedException

Check whether the log splitter is ready to supply tasks

Returns:

false if there is no tasks

Throws:

InterruptedException - if the SplitLogWorker was stopped

getTaskReadySeq

int getTaskReadySeq()

Used by unit tests to check how many tasks were processed

Returns:

number of tasks

registerListener

void registerListener()

set the listener for task changes. Implementation specific

removeListener

void removeListener()

remove the listener for task changes. Implementation specific

endTask

void endTask(SplitLogTask slt,
             LongAdder ctr,
             SplitLogWorkerCoordination.SplitTaskDetails splitTaskDetails)

Notify coordination engine that splitting task has completed.

Parameters:

slt - See SplitLogTask

ctr - counter to be updated

splitTaskDetails - details about log split task (specific to coordination engine being used).