org.apache.hadoop.hbase.replication.regionserver

类 WALEntryStream

java.lang.Object

org.apache.hadoop.hbase.replication.regionserver.WALEntryStream

所有已实现的接口:

Closeable, AutoCloseable, Iterable<WAL.Entry>, Iterator<WAL.Entry>

@InterfaceAudience.Private
@InterfaceStability.Evolving
public class WALEntryStream
extends Object
implements Iterator<WAL.Entry>, Closeable, Iterable<WAL.Entry>

Streaming access to WAL entries. This class is given a queue of WAL Path, and continually iterates through all the WAL WAL.Entry in the queue. When it's done reading from a Path, it dequeues it and starts reading from the next.

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	WALEntryStream.WALEntryStreamRuntimeException

构造器概要

构造器

构造器和说明
WALEntryStream(PriorityBlockingQueue<org.apache.hadoop.fs.Path> logQueue, org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.conf.Configuration conf, long startPosition, MetricsSource metrics) Create an entry stream over the given queue at the given start position
WALEntryStream(PriorityBlockingQueue<org.apache.hadoop.fs.Path> logQueue, org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.conf.Configuration conf, MetricsSource metrics) Create an entry stream over the given queue

方法概要

方法

限定符和类型	方法和说明
void	close()
org.apache.hadoop.fs.Path	getCurrentPath()
long	getPosition()
boolean	hasNext()
Iterator<WAL.Entry>	iterator()
WAL.Entry	next()
void	remove() Not supported.
void	reset() Should be called if the stream is to be reused (i.e. used again after hasNext() has returned false)

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

WALEntryStream

public WALEntryStream(PriorityBlockingQueue<org.apache.hadoop.fs.Path> logQueue,
              org.apache.hadoop.fs.FileSystem fs,
              org.apache.hadoop.conf.Configuration conf,
              MetricsSource metrics)
               throws IOException

Create an entry stream over the given queue

参数:

logQueue - the queue of WAL paths

fs - FileSystem to use to create WAL.Reader for this stream

conf - Configuration to use to create WAL.Reader for this stream

metrics - replication metrics

抛出:

IOException

WALEntryStream

public WALEntryStream(PriorityBlockingQueue<org.apache.hadoop.fs.Path> logQueue,
              org.apache.hadoop.fs.FileSystem fs,
              org.apache.hadoop.conf.Configuration conf,
              long startPosition,
              MetricsSource metrics)
               throws IOException

Create an entry stream over the given queue at the given start position

参数:

logQueue - the queue of WAL paths

conf - the Configuration to use to create WAL.Reader for this stream

startPosition - the position in the first WAL to start reading at

metrics - the replication metrics

抛出:

IOException

方法详细资料

hasNext

public boolean hasNext()

指定者:

hasNext 在接口中 Iterator<WAL.Entry>

返回:

true if there is another WAL WAL.Entry

抛出:

WALEntryStream.WALEntryStreamRuntimeException - if there was an Exception while reading

next

public WAL.Entry next()

指定者:

next 在接口中 Iterator<WAL.Entry>

返回:

the next WAL entry in this stream

抛出:

WALEntryStream.WALEntryStreamRuntimeException - if there was an IOException

NoSuchElementException - if no more entries in the stream.

remove

public void remove()

Not supported.

指定者:

remove 在接口中 Iterator<WAL.Entry>

close

public void close()
           throws IOException

指定者:

close 在接口中 Closeable

指定者:

close 在接口中 AutoCloseable

抛出:

IOException

iterator

public Iterator<WAL.Entry> iterator()

指定者:

iterator 在接口中 Iterable<WAL.Entry>

返回:

the iterator over WAL entries in the queue.

getPosition

public long getPosition()

返回:

the position of the last Entry returned by next()

getCurrentPath

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

返回:

the Path of the current WAL

reset

public void reset()
           throws IOException

Should be called if the stream is to be reused (i.e. used again after hasNext() has returned false)

抛出:

IOException