org.apache.hadoop.hbase.master.assignment

Class SplitTableRegionProcedure

java.lang.Object

org.apache.hadoop.hbase.procedure2.Procedure<TEnvironment>

org.apache.hadoop.hbase.procedure2.StateMachineProcedure<MasterProcedureEnv,TState>

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

org.apache.hadoop.hbase.master.procedure.AbstractStateMachineRegionProcedure<MasterProcedureProtos.SplitTableRegionState>

org.apache.hadoop.hbase.master.assignment.SplitTableRegionProcedure

All Implemented Interfaces:

Comparable<Procedure<MasterProcedureEnv>>, TableProcedureInterface

@InterfaceAudience.Private
public class SplitTableRegionProcedure
extends AbstractStateMachineRegionProcedure<MasterProcedureProtos.SplitTableRegionState>

The procedure to split a region in a table. Takes lock on the parent region. It holds the lock for the life of the procedure.

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

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hbase.procedure2.StateMachineProcedure

StateMachineProcedure.Flow

Nested classes/interfaces inherited from class org.apache.hadoop.hbase.procedure2.Procedure

Procedure.LockState

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

TableProcedureInterface.TableOperationType

Field Summary

Fields inherited from class org.apache.hadoop.hbase.procedure2.StateMachineProcedure

stateCount

Fields inherited from class org.apache.hadoop.hbase.procedure2.Procedure

NO_PROC_ID, NO_TIMEOUT

Constructor Summary

Constructors

Constructor and Description
SplitTableRegionProcedure()
SplitTableRegionProcedure(MasterProcedureEnv env, RegionInfo regionToSplit, byte[] splitRow)

Method Summary

Modifier and Type	Method and Description
protected boolean	abort(MasterProcedureEnv env) The abort() call is asynchronous and each procedure must decide how to deal with it, if they want to be abortable.
void	createDaughterRegions(MasterProcedureEnv env) Create daughter regions
protected void	deserializeStateData(ProcedureStateSerializer serializer) Called on store load to allow the user to decode the previously serialized state.
protected StateMachineProcedure.Flow	executeFromState(MasterProcedureEnv env, MasterProcedureProtos.SplitTableRegionState state) called to perform a single step of the specified 'state' of the procedure
protected MasterProcedureProtos.SplitTableRegionState	getInitialState() Return the initial state object that will be used for the first call to executeFromState().
protected ProcedureMetrics	getProcedureMetrics(MasterProcedureEnv env) Override this method to provide procedure specific counters for submitted count, failed count and time histogram.
protected MasterProcedureProtos.SplitTableRegionState	getState(int stateId) Convert an ordinal (or state id) to an Enum (or more descriptive) state object.
protected int	getStateId(MasterProcedureProtos.SplitTableRegionState state) Convert the Enum (or more descriptive) state object to an ordinal (or state id).
TableProcedureInterface.TableOperationType	getTableOperationType() Given an operation type we can take decisions about what to do with pending operations.
protected boolean	isRollbackSupported(MasterProcedureProtos.SplitTableRegionState state) Used by the default implementation of abort() to know if the current state can be aborted and rollback can be triggered.
boolean	prepareSplitRegion(MasterProcedureEnv env) Prepare to Split region.
protected void	rollbackState(MasterProcedureEnv env, MasterProcedureProtos.SplitTableRegionState state) To rollback SplitTableRegionProcedure, an AssignProcedure is asynchronously submitted for parent region to be split (rollback doesn't wait on the completion of the AssignProcedure) .
protected void	serializeStateData(ProcedureStateSerializer serializer) The user-level code of the procedure may have some state to persist (e.g.
void	toStringClassDetails(StringBuilder sb) Extend the toString() information with the procedure details e.g.

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

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

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

checkOnline, getUser, getWALRegionDir, preflightChecks, releaseSyncLatch, setUser, waitInitialized

Methods inherited from class org.apache.hadoop.hbase.procedure2.StateMachineProcedure

addChildProcedure, execute, failIfAborted, getCurrentState, getCurrentStateId, getCycles, isEofState, isYieldAfterExecutionStep, isYieldBeforeExecuteFromState, rollback, setNextState, toStringState

Methods inherited from class org.apache.hadoop.hbase.procedure2.Procedure

addStackIndex, afterReplay, beforeReplay, bypass, compareTo, completionCleanup, doExecute, doRollback, elapsedTime, getChildrenLatch, getException, getLastUpdate, getNonceKey, getOwner, getParentProcId, getProcId, getProcIdHashCode, getProcName, getResult, getRootProcedureId, getRootProcId, getStackIndexes, getState, getSubmittedTime, getTimeout, getTimeoutTimestamp, hasChildren, hasException, hasLock, hasOwner, hasParent, hasTimeout, haveSameParent, incChildrenLatch, isBypass, isFailed, isFinished, isInitializing, isLockedWhenLoading, isRunnable, isSuccess, isWaiting, removeStackIndex, setAbortFailure, setChildrenLatch, setFailure, setFailure, setLastUpdate, setNonceKey, setOwner, setOwner, setParentProcId, setProcId, setResult, setRootProcId, setStackIndexes, setState, setSubmittedTime, setTimeout, setTimeoutFailure, shouldWaitClientAck, skipPersistence, toString, toStringClass, toStringDetails, toStringSimpleSB, updateMetricsOnFinish, updateMetricsOnSubmit, updateTimestamp, wasExecuted

Methods inherited from class java.lang.Object

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

Constructor Detail

SplitTableRegionProcedure

public SplitTableRegionProcedure()

SplitTableRegionProcedure

public SplitTableRegionProcedure(MasterProcedureEnv env,
                                 RegionInfo regionToSplit,
                                 byte[] splitRow)
                          throws IOException

Throws:

IOException

Method Detail

executeFromState

protected StateMachineProcedure.Flow executeFromState(MasterProcedureEnv env,
                                                      MasterProcedureProtos.SplitTableRegionState state)
                                               throws InterruptedException

Description copied from class: StateMachineProcedure

called to perform a single step of the specified 'state' of the procedure

Specified by:

executeFromState in class StateMachineProcedure<MasterProcedureEnv,MasterProcedureProtos.SplitTableRegionState>

state - state to execute

Returns:

Flow.NO_MORE_STATE if the procedure is completed, Flow.HAS_MORE_STATE if there is another step.

Throws:

InterruptedException

rollbackState

protected void rollbackState(MasterProcedureEnv env,
                             MasterProcedureProtos.SplitTableRegionState state)
                      throws IOException,
                             InterruptedException

To rollback SplitTableRegionProcedure, an AssignProcedure is asynchronously submitted for parent region to be split (rollback doesn't wait on the completion of the AssignProcedure) . This can be improved by changing rollback() to support sub-procedures. See HBASE-19851 for details.

Specified by:

rollbackState in class StateMachineProcedure<MasterProcedureEnv,MasterProcedureProtos.SplitTableRegionState>

state - state to rollback

Throws:

IOException - temporary failure, the rollback will retry later

InterruptedException

isRollbackSupported

protected boolean isRollbackSupported(MasterProcedureProtos.SplitTableRegionState state)

Description copied from class: StateMachineProcedure

Used by the default implementation of abort() to know if the current state can be aborted and rollback can be triggered.

Overrides:

isRollbackSupported in class StateMachineProcedure<MasterProcedureEnv,MasterProcedureProtos.SplitTableRegionState>

getState

protected MasterProcedureProtos.SplitTableRegionState getState(int stateId)

Description copied from class: StateMachineProcedure

Convert an ordinal (or state id) to an Enum (or more descriptive) state object.

Specified by:

getState in class StateMachineProcedure<MasterProcedureEnv,MasterProcedureProtos.SplitTableRegionState>

Parameters:

stateId - the ordinal() of the state enum (or state id)

Returns:

the state enum object

getStateId

protected int getStateId(MasterProcedureProtos.SplitTableRegionState state)

Description copied from class: StateMachineProcedure

Convert the Enum (or more descriptive) state object to an ordinal (or state id).

Specified by:

getStateId in class StateMachineProcedure<MasterProcedureEnv,MasterProcedureProtos.SplitTableRegionState>

Parameters:

state - the state enum object

Returns:

stateId the ordinal() of the state enum (or state id)

getInitialState

protected MasterProcedureProtos.SplitTableRegionState getInitialState()

Description copied from class: StateMachineProcedure

Return the initial state object that will be used for the first call to executeFromState().

Specified by:

getInitialState in class StateMachineProcedure<MasterProcedureEnv,MasterProcedureProtos.SplitTableRegionState>

Returns:

the initial state enum object

serializeStateData

protected void serializeStateData(ProcedureStateSerializer serializer)
                           throws IOException

Description copied from class: Procedure

The user-level code of the procedure may have some state to persist (e.g. input arguments or current position in the processing state) to be able to resume on failure.

Overrides:

serializeStateData in class AbstractStateMachineRegionProcedure<MasterProcedureProtos.SplitTableRegionState>

Parameters:

serializer - stores the serializable state

Throws:

IOException

deserializeStateData

protected void deserializeStateData(ProcedureStateSerializer serializer)
                             throws IOException

Description copied from class: Procedure

Called on store load to allow the user to decode the previously serialized state.

Overrides:

deserializeStateData in class AbstractStateMachineRegionProcedure<MasterProcedureProtos.SplitTableRegionState>

Parameters:

serializer - contains the serialized state

Throws:

IOException

toStringClassDetails

public void toStringClassDetails(StringBuilder sb)

Description copied from class: Procedure

Extend the toString() information with the procedure details e.g. className and parameters

Overrides:

toStringClassDetails in class AbstractStateMachineRegionProcedure<MasterProcedureProtos.SplitTableRegionState>

Parameters:

sb - the string builder to use to append the proc specific information

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<MasterProcedureProtos.SplitTableRegionState>

Returns:

the operation type that the procedure is executing.

getProcedureMetrics

protected ProcedureMetrics getProcedureMetrics(MasterProcedureEnv env)

Description copied from class: Procedure

Override this method to provide procedure specific counters for submitted count, failed count and time histogram.

Overrides:

getProcedureMetrics in class Procedure<MasterProcedureEnv>

Parameters:

env - The environment passed to the procedure executor

Returns:

Container object for procedure related metric

prepareSplitRegion

public boolean prepareSplitRegion(MasterProcedureEnv env)
                           throws IOException

Prepare to Split region.

Parameters:

env - MasterProcedureEnv

Throws:

IOException

createDaughterRegions

public void createDaughterRegions(MasterProcedureEnv env)
                           throws IOException

Create daughter regions

Parameters:

env - MasterProcedureEnv

Throws:

IOException

abort

protected boolean abort(MasterProcedureEnv env)

Description copied from class: Procedure

The abort() call is asynchronous and each procedure must decide how to deal with it, if they want to be abortable. The simplest implementation is to have an AtomicBoolean set in the abort() method and then the execute() will check if the abort flag is set or not. abort() may be called multiple times from the client, so the implementation must be idempotent.

NOTE: abort() is not like Thread.interrupt(). It is just a notification that allows the procedure implementor abort.

Overrides:

abort in class StateMachineProcedure<MasterProcedureEnv,MasterProcedureProtos.SplitTableRegionState>