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java.lang.Objectorg.apache.hadoop.hbase.io.hfile.AbstractHFileReader
org.apache.hadoop.hbase.io.hfile.HFileReaderV2
public class HFileReaderV2
HFile reader for version 2.
| Nested Class Summary | |
|---|---|
protected static class |
HFileReaderV2.ScannerV2
Implementation of HFileScanner interface. |
| Nested classes/interfaces inherited from class org.apache.hadoop.hbase.io.hfile.AbstractHFileReader |
|---|
AbstractHFileReader.BlockIndexNotLoadedException, AbstractHFileReader.NotSeekedException, AbstractHFileReader.Scanner |
| Field Summary |
|---|
| Fields inherited from class org.apache.hadoop.hbase.io.hfile.AbstractHFileReader |
|---|
avgKeyLen, avgValueLen, blockLoads, cacheConf, cacheHits, closeIStream, comparator, compressAlgo, dataBlockIndexReader, fileInfo, fileSize, fsBlockReader, istream, lastKey, metaBlockIndexReader, metaLoads, name, path, trailer |
| Constructor Summary | |
|---|---|
HFileReaderV2(org.apache.hadoop.fs.Path path,
FixedFileTrailer trailer,
org.apache.hadoop.fs.FSDataInputStream fsdis,
long size,
boolean closeIStream,
CacheConfig cacheConf)
Opens a HFile. |
|
| Method Summary | |
|---|---|
void |
close()
|
void |
close(boolean evictOnClose)
Close method with optional evictOnClose |
DataInput |
getBloomFilterMetadata()
Returns a buffer with the Bloom filter metadata. |
byte[] |
getLastKey()
|
ByteBuffer |
getMetaBlock(String metaBlockName,
boolean cacheBlock)
|
HFileScanner |
getScanner(boolean cacheBlocks,
boolean pread,
boolean isCompaction)
Create a Scanner on this file. |
boolean |
isFileInfoLoaded()
|
byte[] |
midkey()
|
HFileBlock |
readBlock(long dataBlockOffset,
long onDiskBlockSize,
boolean cacheBlock,
boolean pread,
boolean isCompaction)
Read in a file block. |
| Methods inherited from class org.apache.hadoop.hbase.io.hfile.AbstractHFileReader |
|---|
getColumnFamilyName, getComparator, getCompressionAlgorithm, getDataBlockIndexReader, getEntries, getFirstKey, getFirstRowKey, getLastRowKey, getName, getPath, getScanner, getTrailer, indexSize, length, loadFileInfo, parseCfNameFromPath, toString, toStringFirstKey, toStringLastKey |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
|---|
public HFileReaderV2(org.apache.hadoop.fs.Path path,
FixedFileTrailer trailer,
org.apache.hadoop.fs.FSDataInputStream fsdis,
long size,
boolean closeIStream,
CacheConfig cacheConf)
throws IOException
AbstractHFileReader.loadFileInfo().
path - Path to HFile.trailer - File trailer.fsdis - input stream. Caller is responsible for closing the passed
stream.size - Length of the stream.closeIStream - Whether to close the stream.cacheConf - Cache configuration.
IOException| Method Detail |
|---|
public HFileScanner getScanner(boolean cacheBlocks,
boolean pread,
boolean isCompaction)
HFileScanner.seekTo(byte[]) to position an start the read. There is
nothing to clean up in a Scanner. Letting go of your references to the
scanner is sufficient.
cacheBlocks - True if we should cache blocks read in by this scanner.pread - Use positional read rather than seek+read if true (pread is
better for random reads, seek+read is better scanning).isCompaction - is scanner being used for a compaction?
public ByteBuffer getMetaBlock(String metaBlockName,
boolean cacheBlock)
throws IOException
metaBlockName - cacheBlock - Add block to cache, if found
IOException
public HFileBlock readBlock(long dataBlockOffset,
long onDiskBlockSize,
boolean cacheBlock,
boolean pread,
boolean isCompaction)
throws IOException
dataBlockOffset - offset to read.onDiskBlockSize - size of the blockcacheBlock - pread - Use positional read instead of seek+read (positional is better
doing random reads whereas seek+read is better scanning).isCompaction - is this block being read as part of a compaction
IOExceptionpublic byte[] getLastKey()
public byte[] midkey()
throws IOException
IOException
public void close()
throws IOException
IOException
public void close(boolean evictOnClose)
throws IOException
HFile.Reader
IOException
public DataInput getBloomFilterMetadata()
throws IOException
IOExceptionpublic boolean isFileInfoLoaded()
isFileInfoLoaded in class AbstractHFileReader
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