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java.lang.Objectorg.apache.hadoop.hbase.io.hfile.HFileBlock.AbstractFSReader
public abstract static class HFileBlock.AbstractFSReader
A common implementation of some methods of HFileBlock.FSReader and some
tools for implementing HFile format version-specific block readers.
| Field Summary | |
|---|---|
protected Compression.Algorithm |
compressAlgo
Compression algorithm used by the HFile |
static int |
DEFAULT_BUFFER_SIZE
The default buffer size for our buffered streams |
protected long |
fileSize
The size of the file we are reading from, or -1 if unknown. |
protected org.apache.hadoop.fs.FSDataInputStream |
istream
The file system stream of the underlying HFile |
| Constructor Summary | |
|---|---|
HFileBlock.AbstractFSReader(org.apache.hadoop.fs.FSDataInputStream istream,
Compression.Algorithm compressAlgo,
long fileSize)
|
|
| Method Summary | |
|---|---|
HFileBlock.BlockIterator |
blockRange(long startOffset,
long endOffset)
Creates a block iterator over the given portion of the HFile. |
protected InputStream |
createBufferedBoundedStream(long offset,
int size,
boolean pread)
Creates a buffered stream reading a certain slice of the file system input stream. |
protected void |
decompress(byte[] dest,
int destOffset,
InputStream bufferedBoundedStream,
int compressedSize,
int uncompressedSize)
Decompresses data from the given stream using the configured compression algorithm. |
protected int |
readAtOffset(byte[] dest,
int destOffset,
int size,
boolean peekIntoNextBlock,
long fileOffset,
boolean pread)
Does a positional read or a seek and read into the given buffer. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Methods inherited from interface org.apache.hadoop.hbase.io.hfile.HFileBlock.FSReader |
|---|
readBlockData |
| Field Detail |
|---|
protected org.apache.hadoop.fs.FSDataInputStream istream
HFile
protected Compression.Algorithm compressAlgo
HFile
protected long fileSize
public static final int DEFAULT_BUFFER_SIZE
| Constructor Detail |
|---|
public HFileBlock.AbstractFSReader(org.apache.hadoop.fs.FSDataInputStream istream,
Compression.Algorithm compressAlgo,
long fileSize)
| Method Detail |
|---|
public HFileBlock.BlockIterator blockRange(long startOffset,
long endOffset)
HFileBlock.FSReaderHFile.
The iterator returns blocks starting with offset such that offset <=
startOffset < endOffset.
blockRange in interface HFileBlock.FSReaderstartOffset - the offset of the block to start iteration withendOffset - the offset to end iteration at (exclusive)
protected int readAtOffset(byte[] dest,
int destOffset,
int size,
boolean peekIntoNextBlock,
long fileOffset,
boolean pread)
throws IOException
dest - destination bufferdestOffset - offset in the destination buffersize - size of the block to be readpeekIntoNextBlock - whether to read the next block's on-disk sizefileOffset - position in the stream to read atpread - whether we should do a positional read
IOException
protected void decompress(byte[] dest,
int destOffset,
InputStream bufferedBoundedStream,
int compressedSize,
int uncompressedSize)
throws IOException
dest - destOffset - bufferedBoundedStream - a stream to read compressed data from, bounded to the exact
amount of compressed datacompressedSize - compressed data size, header not includeduncompressedSize - uncompressed data size, header not included
IOException
protected InputStream createBufferedBoundedStream(long offset,
int size,
boolean pread)
offset - the starting file offset the bounded stream reads fromsize - the size of the segment of the file the stream should readpread - whether to use position reads
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