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@InterfaceAudience.Private public interface HFileDataBlockEncoder
Controls what kind of data block encoding is used. If data block encoding is not set or the given block is not a data block (encoded or not), methods should just return the unmodified block.
| Field Summary | |
|---|---|
static byte[] |
DATA_BLOCK_ENCODING
Type of encoding used for data blocks in HFile. |
| Method Summary | |
|---|---|
void |
beforeWriteToDisk(ByteBuffer in,
boolean includesMemstoreTS,
HFileBlockEncodingContext encodingResult,
BlockType blockType)
Should be called before an encoded or unencoded data block is written to disk. |
HFileBlock |
diskToCacheFormat(HFileBlock block,
boolean isCompaction)
Converts a block from the on-disk format to the in-cache format. |
DataBlockEncoding |
getEffectiveEncodingInCache(boolean isCompaction)
|
DataBlockEncoding |
getEncodingInCache()
|
DataBlockEncoding |
getEncodingOnDisk()
|
HFileBlockDecodingContext |
newOnDiskDataBlockDecodingContext(Compression.Algorithm compressionAlgorithm)
create a encoder specific decoding context for reading. |
HFileBlockEncodingContext |
newOnDiskDataBlockEncodingContext(Compression.Algorithm compressionAlgorithm,
byte[] headerBytes)
Create an encoder specific encoding context object for writing. |
void |
saveMetadata(HFile.Writer writer)
Save metadata in HFile which will be written to disk |
boolean |
useEncodedScanner(boolean isCompaction)
Decides whether we should use a scanner over encoded blocks. |
| Field Detail |
|---|
static final byte[] DATA_BLOCK_ENCODING
| Method Detail |
|---|
HFileBlock diskToCacheFormat(HFileBlock block,
boolean isCompaction)
block - a block in an on-disk format (read from HFile or freshly
generated).
void beforeWriteToDisk(ByteBuffer in,
boolean includesMemstoreTS,
HFileBlockEncodingContext encodingResult,
BlockType blockType)
throws IOException
in - KeyValues next to each otherencodingResult - the encoded resultblockType - block type
IOExceptionboolean useEncodedScanner(boolean isCompaction)
isCompaction - whether we are in a compaction.
void saveMetadata(HFile.Writer writer)
throws IOException
writer - writer for a given HFile
IOException - on disk problemsDataBlockEncoding getEncodingOnDisk()
DataBlockEncoding getEncodingInCache()
DataBlockEncoding getEffectiveEncodingInCache(boolean isCompaction)
HFileBlockEncodingContext newOnDiskDataBlockEncodingContext(Compression.Algorithm compressionAlgorithm,
byte[] headerBytes)
compressionAlgorithm - compression algorithmheaderBytes - header bytes
HFileBlockEncodingContext objectHFileBlockDecodingContext newOnDiskDataBlockDecodingContext(Compression.Algorithm compressionAlgorithm)
compressionAlgorithm -
HFileBlockDecodingContext object
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