Package org.apache.hadoop.hdfs.server.namenode

Class NullBlockAliasMap

java.lang.Object

org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap<org.apache.hadoop.hdfs.server.common.FileRegion>

org.apache.hadoop.hdfs.server.namenode.NullBlockAliasMap

@Public
@Unstable
public class NullBlockAliasMap
extends org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap<org.apache.hadoop.hdfs.server.common.FileRegion>

Null sink for region information emitted from FSImage.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap

org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.ImmutableIterator, org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Reader<U extends org.apache.hadoop.hdfs.server.common.BlockAlias>, org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Writer<U extends org.apache.hadoop.hdfs.server.common.BlockAlias>

Constructor Summary

Constructors

Constructor	Description
NullBlockAliasMap()

Method Summary

Modifier and Type	Method	Description
void	close()
org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Reader<org.apache.hadoop.hdfs.server.common.FileRegion>	getReader(org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Reader.Options opts, java.lang.String blockPoolID)
org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Writer	getWriter(org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Writer.Options opts, java.lang.String blockPoolID)
void	refresh()

Methods inherited from class java.lang.Object

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

Constructor Detail

NullBlockAliasMap

public NullBlockAliasMap()

Method Detail

getReader

public org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Reader<org.apache.hadoop.hdfs.server.common.FileRegion> getReader(org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Reader.Options opts,
                                                                                                                                          java.lang.String blockPoolID)
                                                                                                                                   throws java.io.IOException

Specified by:

getReader in class org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap<org.apache.hadoop.hdfs.server.common.FileRegion>

Throws:

java.io.IOException

getWriter

public org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Writer getWriter(org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Writer.Options opts,
                                                                                         java.lang.String blockPoolID)
                                                                                  throws java.io.IOException

Specified by:

getWriter in class org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap<org.apache.hadoop.hdfs.server.common.FileRegion>

Throws:

java.io.IOException

refresh

public void refresh()
             throws java.io.IOException

Specified by:

refresh in class org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap<org.apache.hadoop.hdfs.server.common.FileRegion>

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Specified by:

close in class org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap<org.apache.hadoop.hdfs.server.common.FileRegion>

Throws:

java.io.IOException