org.apache.hadoop.hbase.master.assignment

Class MoveRegionProcedure

java.lang.Object

<any>

org.apache.hadoop.hbase.master.procedure.AbstractStateMachineTableProcedure<TState>

org.apache.hadoop.hbase.master.procedure.AbstractStateMachineRegionProcedure<MoveRegionState>

org.apache.hadoop.hbase.master.assignment.MoveRegionProcedure

All Implemented Interfaces:

TableProcedureInterface

public class MoveRegionProcedure
extends AbstractStateMachineRegionProcedure<MoveRegionState>

Procedure that implements a RegionPlan. It first runs an unassign subprocedure followed by an assign subprocedure. It takes a lock on the region being moved. It holds the lock for the life of the procedure.

Throws exception on construction if determines context hostile to move (cluster going down or master is shutting down or table is disabled).

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.hbase.master.procedure.TableProcedureInterface

TableProcedureInterface.TableOperationType

Constructor Summary

Constructors

Constructor and Description
MoveRegionProcedure()
MoveRegionProcedure(MasterProcedureEnv env, RegionPlan plan, boolean check)

Method Summary

Modifier and Type	Method and Description
boolean	abort(MasterProcedureEnv env)
protected void	deserializeStateData(ProcedureStateSerializer serializer)
protected Flow	executeFromState(MasterProcedureEnv env, MoveRegionState state)
protected MoveRegionState	getInitialState()
protected MoveRegionState	getState(int stateId)
protected int	getStateId(MoveRegionState state)
TableName	getTableName()
TableProcedureInterface.TableOperationType	getTableOperationType() Given an operation type we can take decisions about what to do with pending operations.
protected void	rollbackState(MasterProcedureEnv env, MoveRegionState state)
protected void	serializeStateData(ProcedureStateSerializer serializer)
void	toStringClassDetails(java.lang.StringBuilder sb)

Methods inherited from class org.apache.hadoop.hbase.master.procedure.AbstractStateMachineRegionProcedure

acquireLock, checkTableModifiable, getRegion, hasLock, holdLock, releaseLock, setFailure, setRegion

Methods inherited from class org.apache.hadoop.hbase.master.procedure.AbstractStateMachineTableProcedure

checkOnline, getRegionDir, getUser, preflightChecks, releaseSyncLatch, setUser

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MoveRegionProcedure

public MoveRegionProcedure()

MoveRegionProcedure

public MoveRegionProcedure(MasterProcedureEnv env,
                           RegionPlan plan,
                           boolean check)
                    throws HBaseIOException

Parameters:

check - whether we should do some checks in the constructor. We will skip the checks if we are reopening a region as this may fail the whole procedure and cause stuck. We will do the check later when actually executing the procedure so not a big problem.

Throws:

java.io.IOException - If the cluster is offline or master is stopping or if table is disabled or non-existent.

HBaseIOException

Method Detail

executeFromState

protected Flow executeFromState(MasterProcedureEnv env,
                                MoveRegionState state)
                         throws java.lang.InterruptedException

Throws:

java.lang.InterruptedException

rollbackState

protected void rollbackState(MasterProcedureEnv env,
                             MoveRegionState state)
                      throws java.io.IOException

Throws:

java.io.IOException

abort

public boolean abort(MasterProcedureEnv env)

toStringClassDetails

public void toStringClassDetails(java.lang.StringBuilder sb)

Overrides:

toStringClassDetails in class AbstractStateMachineRegionProcedure<MoveRegionState>

getInitialState

protected MoveRegionState getInitialState()

getStateId

protected int getStateId(MoveRegionState state)

getState

protected MoveRegionState getState(int stateId)

getTableName

public TableName getTableName()

Specified by:

getTableName in interface TableProcedureInterface

Overrides:

getTableName in class AbstractStateMachineRegionProcedure<MoveRegionState>

Returns:

the name of the table the procedure is operating on

getTableOperationType

public TableProcedureInterface.TableOperationType getTableOperationType()

Description copied from interface: TableProcedureInterface

Given an operation type we can take decisions about what to do with pending operations. e.g. if we get a delete and we have some table operation pending (e.g. add column) we can abort those operations.

Specified by:

getTableOperationType in interface TableProcedureInterface

Specified by:

getTableOperationType in class AbstractStateMachineRegionProcedure<MoveRegionState>

Returns:

the operation type that the procedure is executing.

serializeStateData

protected void serializeStateData(ProcedureStateSerializer serializer)
                           throws java.io.IOException

Overrides:

serializeStateData in class AbstractStateMachineRegionProcedure<MoveRegionState>

Throws:

java.io.IOException

deserializeStateData

protected void deserializeStateData(ProcedureStateSerializer serializer)
                             throws java.io.IOException

Overrides:

deserializeStateData in class AbstractStateMachineRegionProcedure<MoveRegionState>

Throws:

java.io.IOException