org.apache.hadoop.hbase.regionserver.wal

Class WALCoprocessorHost

java.lang.Object

<any>

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

public class WALCoprocessorHost
extends <any>

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

Constructor Summary

Constructors

Constructor and Description
WALCoprocessorHost(WAL log, Configuration conf) Constructor

Method Summary

Modifier and Type	Method and Description
WALCoprocessor	checkAndGetInstance(java.lang.Class<?> implClass)
org.apache.hadoop.hbase.regionserver.wal.WALCoprocessorHost.WALEnvironment	createEnvironment(WALCoprocessor instance, int priority, int seq, Configuration conf)
void	postWALRoll(Path oldPath, Path newPath) Called after rolling the current WAL
void	postWALWrite(RegionInfo info, WALKey logKey, WALEdit logEdit)
void	preWALRoll(Path oldPath, Path newPath) Called before rolling the current WAL
void	preWALWrite(RegionInfo info, WALKey logKey, WALEdit logEdit)

Methods inherited from class java.lang.Object

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

Constructor Detail

WALCoprocessorHost

public WALCoprocessorHost(WAL log,
                          Configuration conf)

Constructor

Parameters:

log - the write ahead log

conf - the configuration

Method Detail

createEnvironment

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

checkAndGetInstance

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

Throws:

java.lang.IllegalAccessException

java.lang.InstantiationException

preWALWrite

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

Throws:

java.io.IOException

postWALWrite

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

Throws:

java.io.IOException

preWALRoll

public void preWALRoll(Path oldPath,
                       Path newPath)
                throws java.io.IOException

Called before rolling the current WAL

Parameters:

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

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

Throws:

java.io.IOException

postWALRoll

public void postWALRoll(Path oldPath,
                        Path newPath)
                 throws java.io.IOException

Called after rolling the current WAL

Parameters:

oldPath - the path of the wal that we replaced

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

Throws:

java.io.IOException