ReplicationSourceWALReaderThread (Apache HBase 1.7.1 API)

java.lang.Object
- java.lang.Thread
- - org.apache.hadoop.hbase.replication.regionserver.ReplicationSourceWALReaderThread

All Implemented Interfaces:

Runnable
```
@InterfaceAudience.Private
@InterfaceStability.Evolving
public class ReplicationSourceWALReaderThread
extends Thread
```
Reads and filters WAL entries, groups the filtered entries into batches, and puts the batches onto a queue

Nested Class Summary
- Nested classes/interfaces inherited from class java.lang.Thread
  Thread.State, Thread.UncaughtExceptionHandler

Field Summary
- Fields inherited from class java.lang.Thread
  MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

Constructors
Constructor and Description
`ReplicationSourceWALReaderThread(ReplicationSourceManager manager, ReplicationQueueInfo replicationQueueInfo, ReplicationSourceLogQueue logQueue, long startPosition, org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.conf.Configuration conf, WALEntryFilter filter, MetricsSource metrics, ReplicationSource source, String walGroupId)` Creates a reader worker for a given WAL queue.

Method Summary

Methods
Modifier and Type	Method and Description
`org.apache.hadoop.fs.Path`	`getCurrentPath()`
`long`	`getEntrySizeExcludeBulkLoad(WAL.Entry entry)`
`long`	`getLastReadPosition()`
`boolean`	`isReaderRunning()`
`org.apache.hadoop.hbase.replication.regionserver.ReplicationSourceWALReaderThread.WALEntryBatch`	`poll(long timeout)`
`void`	`run()`
`void`	`setReaderRunning(boolean readerRunning)`
`org.apache.hadoop.hbase.replication.regionserver.ReplicationSourceWALReaderThread.WALEntryBatch`	`take()` Retrieves the next batch of WAL entries from the queue, waiting up to the specified time for a batch to become available

Methods inherited from class java.lang.Thread
activeCount, checkAccess, clone, countStackFrames, currentThread, destroy, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ReplicationSourceWALReaderThread

public ReplicationSourceWALReaderThread(ReplicationSourceManager manager,
                                ReplicationQueueInfo replicationQueueInfo,
                                ReplicationSourceLogQueue logQueue,
                                long startPosition,
                                org.apache.hadoop.fs.FileSystem fs,
                                org.apache.hadoop.conf.Configuration conf,
                                WALEntryFilter filter,
                                MetricsSource metrics,
                                ReplicationSource source,
                                String walGroupId)

Creates a reader worker for a given WAL queue. Reads WAL entries off a given queue, batches the entries, and puts them on a batch queue.

Parameters:: manager - replication manager; replicationQueueInfo - replication queue info; logQueue - The WAL queue to read off of; startPosition - position in the first WAL to start reading from; fs - the files system to use; conf - configuration to use; filter - The filter to use while reading; metrics - replication metrics

Method Detail

run
```
public void run()
```
Specified by:

run in interface Runnable

Overrides:

run in class Thread

getCurrentPath

public org.apache.hadoop.fs.Path getCurrentPath()

take
```
public org.apache.hadoop.hbase.replication.regionserver.ReplicationSourceWALReaderThread.WALEntryBatch take()
                                                                                                     throws InterruptedException
```
Retrieves the next batch of WAL entries from the queue, waiting up to the specified time for a batch to become available

Returns:
A batch of entries, along with the position in the log after reading the batch

Throws:

InterruptedException - if interrupted while waiting

poll

public org.apache.hadoop.hbase.replication.regionserver.ReplicationSourceWALReaderThread.WALEntryBatch poll(long timeout)
                                                                                                     throws InterruptedException

Throws:: InterruptedException

getEntrySizeExcludeBulkLoad

public long getEntrySizeExcludeBulkLoad(WAL.Entry entry)

isReaderRunning
```
public boolean isReaderRunning()
```
Returns:
whether the reader thread is running

setReaderRunning
```
public void setReaderRunning(boolean readerRunning)
```
Parameters:
readerRunning - the readerRunning to set

getLastReadPosition
```
public long getLastReadPosition()
```

Class ReplicationSourceWALReaderThread

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Thread

Field Summary

Fields inherited from class java.lang.Thread

Constructor Summary

Method Summary

Methods inherited from class java.lang.Thread

Methods inherited from class java.lang.Object

Constructor Detail

ReplicationSourceWALReaderThread

Method Detail

run

getCurrentPath

take

poll

getEntrySizeExcludeBulkLoad

isReaderRunning

setReaderRunning

getLastReadPosition