org.apache.hadoop.hbase.zookeeper

Class ZKTableStateManager

java.lang.Object

org.apache.hadoop.hbase.zookeeper.ZKTableStateManager

All Implemented Interfaces:

TableStateManager

@InterfaceAudience.Private
public class ZKTableStateManager
extends Object
implements TableStateManager

Implementation of TableStateManager which reads, caches and sets state up in ZooKeeper. If multiple read/write clients, will make for confusion. Code running on client side without consensus context should use ZKTableStateClientSideReader instead.

To save on trips to the zookeeper ensemble, internally we cache table state.

Constructor Summary

Constructors

Constructor and Description
ZKTableStateManager(ZooKeeperWatcher zkw)

Method Summary

Modifier and Type	Method and Description
void	checkAndRemoveTableState(TableName tableName, ZooKeeperProtos.Table.State states, boolean deletePermanentState) If the table is found in the given state the in-memory state is removed.
Set<TableName>	getTablesInStates(ZooKeeperProtos.Table.State... states) Gets a list of all the tables set as disabling in zookeeper.
boolean	isTablePresent(TableName tableName) check if table is present.
boolean	isTableState(TableName tableName, boolean checkSource, ZooKeeperProtos.Table.State... states) Checks if table is marked in specified state in ZK.
boolean	isTableState(TableName tableName, ZooKeeperProtos.Table.State... states) Checks if table is marked in specified state in ZK (using cache only).
void	setDeletedTable(TableName tableName) Deletes the table in zookeeper.
void	setTableState(TableName tableName, ZooKeeperProtos.Table.State state) Sets table state in ZK.
boolean	setTableStateIfInStates(TableName tableName, ZooKeeperProtos.Table.State newState, ZooKeeperProtos.Table.State... states) Checks and sets table state in ZK.
boolean	setTableStateIfNotInStates(TableName tableName, ZooKeeperProtos.Table.State newState, ZooKeeperProtos.Table.State... states) Checks and sets table state in ZK.

Methods inherited from class java.lang.Object

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

Constructor Detail

ZKTableStateManager

public ZKTableStateManager(ZooKeeperWatcher zkw)
                    throws KeeperException,
                           InterruptedException

Throws:

KeeperException

InterruptedException

Method Detail

setTableState

public void setTableState(TableName tableName,
                          ZooKeeperProtos.Table.State state)
                   throws CoordinatedStateException

Sets table state in ZK. Sets no watches. Sets the table into desired state. Fails silently if the table is already in this state.

Specified by:

setTableState in interface TableStateManager

Parameters:

tableName - table to process

state - new state of this table

Throws:

CoordinatedStateException - if error happened when trying to set table state

setTableStateIfInStates

public boolean setTableStateIfInStates(TableName tableName,
                                       ZooKeeperProtos.Table.State newState,
                                       ZooKeeperProtos.Table.State... states)
                                throws CoordinatedStateException

Checks and sets table state in ZK. Sets no watches. Sets the specified table into the newState, but only if the table is already in one of the possibleCurrentStates (otherwise no operation is performed).

Specified by:

setTableStateIfInStates in interface TableStateManager

Parameters:

tableName - table to process

newState - new state for the table

states - table should be in one of these states for the operation to be performed

Returns:

true if operation succeeded, false otherwise

Throws:

CoordinatedStateException - if error happened while performing operation

setTableStateIfNotInStates

public boolean setTableStateIfNotInStates(TableName tableName,
                                          ZooKeeperProtos.Table.State newState,
                                          ZooKeeperProtos.Table.State... states)
                                   throws CoordinatedStateException

Checks and sets table state in ZK. Sets no watches. Sets the specified table into the newState, but only if the table is NOT in one of the possibleCurrentStates (otherwise no operation is performed).

Specified by:

setTableStateIfNotInStates in interface TableStateManager

Parameters:

tableName - table to process

newState - new state for the table

states - table should NOT be in one of these states for the operation to be performed

Returns:

true if operation succeeded, false otherwise

Throws:

CoordinatedStateException - if error happened while performing operation

isTableState

public boolean isTableState(TableName tableName,
                            ZooKeeperProtos.Table.State... states)

Checks if table is marked in specified state in ZK (using cache only).

Specified by:

isTableState in interface TableStateManager

Returns:

true if the table is in any one of the listed states, false otherwise.

isTableState

public boolean isTableState(TableName tableName,
                            boolean checkSource,
                            ZooKeeperProtos.Table.State... states)

Checks if table is marked in specified state in ZK.

Specified by:

isTableState in interface TableStateManager

Returns:

true if the table is in any one of the listed states, false otherwise.

setDeletedTable

public void setDeletedTable(TableName tableName)
                     throws CoordinatedStateException

Deletes the table in zookeeper. Fails silently if the table is not currently disabled in zookeeper. Sets no watches. Mark table as deleted. Fails silently if the table is not currently marked as disabled.

Specified by:

setDeletedTable in interface TableStateManager

Parameters:

tableName - table to be deleted

Throws:

CoordinatedStateException - if error happened while performing operation

isTablePresent

public boolean isTablePresent(TableName tableName)

check if table is present.

Specified by:

isTablePresent in interface TableStateManager

Parameters:

tableName - table we're working on

Returns:

true if the table is present

getTablesInStates

public Set<TableName> getTablesInStates(ZooKeeperProtos.Table.State... states)
                                 throws InterruptedIOException,
                                        CoordinatedStateException

Gets a list of all the tables set as disabling in zookeeper.

Specified by:

getTablesInStates in interface TableStateManager

Returns:

Set of disabling tables, empty Set if none

Throws:

CoordinatedStateException - if error happened in underlying coordination engine

InterruptedIOException

checkAndRemoveTableState

public void checkAndRemoveTableState(TableName tableName,
                                     ZooKeeperProtos.Table.State states,
                                     boolean deletePermanentState)
                              throws CoordinatedStateException

If the table is found in the given state the in-memory state is removed. This helps in cases where CreateTable is to be retried by the client in case of failures. If deletePermanentState is true - the flag kept permanently is also reset.

Specified by:

checkAndRemoveTableState in interface TableStateManager

Parameters:

tableName - table we're working on

states - if table isn't in any one of these states, operation aborts

deletePermanentState - if true, reset the permanent flag

Throws:

CoordinatedStateException - if error happened in underlying coordination engine