org.apache.hadoop.hbase.regionserver.wal

类 WALCoprocessorHost

java.lang.Object

org.apache.hadoop.hbase.coprocessor.CoprocessorHost<WALCoprocessor,WALCoprocessorEnvironment>

org.apache.hadoop.hbase.regionserver.wal.WALCoprocessorHost

@InterfaceAudience.Private
public class WALCoprocessorHost
extends CoprocessorHost<WALCoprocessor,WALCoprocessorEnvironment>

Implements the coprocessor environment and runtime support for coprocessors loaded within a WAL.

嵌套类概要

从类继承的嵌套类/接口 org.apache.hadoop.hbase.coprocessor.CoprocessorHost

CoprocessorHost.ObserverGetter<C,O>, CoprocessorHost.ObserverOperationWithoutResult<O>, CoprocessorHost.ObserverOperationWithResult<O,R>

字段概要

从类继承的字段 org.apache.hadoop.hbase.coprocessor.CoprocessorHost

ABORT_ON_ERROR_KEY, abortable, conf, coprocEnvironments, COPROCESSORS_ENABLED_CONF_KEY, DEFAULT_ABORT_ON_ERROR, DEFAULT_COPROCESSORS_ENABLED, DEFAULT_USER_COPROCESSORS_ENABLED, loadSequence, MASTER_COPROCESSOR_CONF_KEY, pathPrefix, REGION_COPROCESSOR_CONF_KEY, REGIONSERVER_COPROCESSOR_CONF_KEY, USER_COPROCESSORS_ENABLED_CONF_KEY, USER_REGION_COPROCESSOR_CONF_KEY, WAL_COPROCESSOR_CONF_KEY

构造器概要

构造器

构造器和说明
WALCoprocessorHost(WAL log, org.apache.hadoop.conf.Configuration conf) Constructor

方法概要

限定符和类型	方法和说明
WALCoprocessor	checkAndGetInstance(Class<?> implClass) Called when a new Coprocessor class needs to be loaded.
org.apache.hadoop.hbase.regionserver.wal.WALCoprocessorHost.WALEnvironment	createEnvironment(WALCoprocessor instance, int priority, int seq, org.apache.hadoop.conf.Configuration conf) Called when a new Coprocessor class is loaded
void	postWALRoll(org.apache.hadoop.fs.Path oldPath, org.apache.hadoop.fs.Path newPath) Called after rolling the current WAL
void	postWALWrite(RegionInfo info, WALKey logKey, WALEdit logEdit)
void	preWALRoll(org.apache.hadoop.fs.Path oldPath, org.apache.hadoop.fs.Path newPath) Called before rolling the current WAL
void	preWALWrite(RegionInfo info, WALKey logKey, WALEdit logEdit)

从类继承的方法 org.apache.hadoop.hbase.coprocessor.CoprocessorHost

abortServer, abortServer, checkAndLoadInstance, execOperation, execOperationWithResult, execShutdown, findCoprocessor, findCoprocessor, findCoprocessorEnvironment, findCoprocessors, getCoprocessors, getLoadedCoprocessors, handleCoprocessorThrowable, load, load, load, loadSystemCoprocessors, shutdown

从类继承的方法 java.lang.Object

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

构造器详细资料

WALCoprocessorHost

public WALCoprocessorHost(WAL log,
                          org.apache.hadoop.conf.Configuration conf)

Constructor

参数:

log - the write ahead log

conf - the configuration

方法详细资料

createEnvironment

public org.apache.hadoop.hbase.regionserver.wal.WALCoprocessorHost.WALEnvironment createEnvironment(WALCoprocessor instance,
                                                                                                    int priority,
                                                                                                    int seq,
                                                                                                    org.apache.hadoop.conf.Configuration conf)

从类复制的说明: CoprocessorHost

Called when a new Coprocessor class is loaded

指定者:

createEnvironment 在类中 CoprocessorHost<WALCoprocessor,WALCoprocessorEnvironment>

checkAndGetInstance

public WALCoprocessor checkAndGetInstance(Class<?> implClass)
                                   throws IllegalAccessException,
                                          InstantiationException

从类复制的说明: CoprocessorHost

Called when a new Coprocessor class needs to be loaded. Checks if type of the given class is what the corresponding host implementation expects. If it is of correct type, returns an instance of the coprocessor to be loaded. If not, returns null. If an exception occurs when trying to create instance of a coprocessor, it's passed up and eventually results into server aborting.

指定者:

checkAndGetInstance 在类中 CoprocessorHost<WALCoprocessor,WALCoprocessorEnvironment>

抛出:

IllegalAccessException

InstantiationException

preWALWrite

public void preWALWrite(RegionInfo info,
                        WALKey logKey,
                        WALEdit logEdit)
                 throws IOException

抛出:

IOException

postWALWrite

public void postWALWrite(RegionInfo info,
                         WALKey logKey,
                         WALEdit logEdit)
                  throws IOException

抛出:

IOException

preWALRoll

public void preWALRoll(org.apache.hadoop.fs.Path oldPath,
                       org.apache.hadoop.fs.Path newPath)
                throws IOException

Called before rolling the current WAL

参数:

oldPath - the path of the current wal that we are replacing

newPath - the path of the wal we are going to create

抛出:

IOException

postWALRoll

public void postWALRoll(org.apache.hadoop.fs.Path oldPath,
                        org.apache.hadoop.fs.Path newPath)
                 throws IOException

Called after rolling the current WAL

参数:

oldPath - the path of the wal that we replaced

newPath - the path of the wal we have created and now is the current

抛出:

IOException