org.apache.accumulo.core.file.blockfile.impl
Class CachableBlockFile.Reader

java.lang.Object
  org.apache.accumulo.core.file.blockfile.impl.CachableBlockFile.Reader

All Implemented Interfaces:

BlockFileReader

Enclosing class:

CachableBlockFile

public static class CachableBlockFile.Reader
extends Object
implements BlockFileReader

Class wraps the BCFile reader.

Constructor Summary

CachableBlockFile.Reader(org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path dataFile, org.apache.hadoop.conf.Configuration conf, BlockCache data, BlockCache index)

CachableBlockFile.Reader(org.apache.hadoop.fs.FSDataInputStream fsin, long len, org.apache.hadoop.conf.Configuration conf)

CachableBlockFile.Reader(org.apache.hadoop.fs.FSDataInputStream fsin, long len, org.apache.hadoop.conf.Configuration conf, BlockCache data, BlockCache index)

Method Summary

CachableBlockFile.BlockRead	cacheMetaBlock(String blockName, BCFile.Reader.BlockReader _currBlock)
void	cacheMetaBlock(String blockName, byte[] b)
void	close()
CachableBlockFile.BlockRead	getCachedMetaBlock(String blockName)
CachableBlockFile.BlockRead	getDataBlock(int blockIndex) It is intended that once the BlockRead object is returned to the caller, that the caller will read the entire block and then call close on the BlockRead class.
ABlockReader	getDataBlock(long offset, long compressedSize, long rawSize)
ABlockReader	getMetaBlock(long offset, long compressedSize, long rawSize)
CachableBlockFile.BlockRead	getMetaBlock(String blockName) It is intended that once the BlockRead object is returned to the caller, that the caller will read the entire block and then call close on the BlockRead class.

Methods inherited from class java.lang.Object

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

Constructor Detail

CachableBlockFile.Reader

public CachableBlockFile.Reader(org.apache.hadoop.fs.FileSystem fs,
                                org.apache.hadoop.fs.Path dataFile,
                                org.apache.hadoop.conf.Configuration conf,
                                BlockCache data,
                                BlockCache index)
                         throws IOException

Throws:

IOException

CachableBlockFile.Reader

public CachableBlockFile.Reader(org.apache.hadoop.fs.FSDataInputStream fsin,
                                long len,
                                org.apache.hadoop.conf.Configuration conf,
                                BlockCache data,
                                BlockCache index)
                         throws IOException

Throws:

IOException

CachableBlockFile.Reader

public CachableBlockFile.Reader(org.apache.hadoop.fs.FSDataInputStream fsin,
                                long len,
                                org.apache.hadoop.conf.Configuration conf)
                         throws IOException

Throws:

IOException

Method Detail

getCachedMetaBlock

public CachableBlockFile.BlockRead getCachedMetaBlock(String blockName)
                                               throws IOException

Throws:

IOException

cacheMetaBlock

public CachableBlockFile.BlockRead cacheMetaBlock(String blockName,
                                                  BCFile.Reader.BlockReader _currBlock)
                                           throws IOException

Throws:

IOException

cacheMetaBlock

public void cacheMetaBlock(String blockName,
                           byte[] b)

getMetaBlock

public CachableBlockFile.BlockRead getMetaBlock(String blockName)
                                         throws IOException

It is intended that once the BlockRead object is returned to the caller, that the caller will read the entire block and then call close on the BlockRead class. NOTE: In the case of multi-read threads: This method can do redundant work where an entry is read from disk and other threads check the cache before it has been inserted.

Specified by:

getMetaBlock in interface BlockFileReader

Throws:

IOException

getMetaBlock

public ABlockReader getMetaBlock(long offset,
                                 long compressedSize,
                                 long rawSize)
                          throws IOException

Specified by:

getMetaBlock in interface BlockFileReader

Throws:

IOException

getDataBlock

public CachableBlockFile.BlockRead getDataBlock(int blockIndex)
                                         throws IOException

It is intended that once the BlockRead object is returned to the caller, that the caller will read the entire block and then call close on the BlockRead class. NOTE: In the case of multi-read threads: This method can do redundant work where an entry is read from disk and other threads check the cache before it has been inserted.

Specified by:

getDataBlock in interface BlockFileReader

Throws:

IOException

getDataBlock

public ABlockReader getDataBlock(long offset,
                                 long compressedSize,
                                 long rawSize)
                          throws IOException

Specified by:

getDataBlock in interface BlockFileReader

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface BlockFileReader

Throws:

IOException