org.apache.hadoop.hbase.regionserver.wal

Class CompressionContext

java.lang.Object

org.apache.hadoop.hbase.regionserver.wal.CompressionContext

@InterfaceAudience.LimitedPrivate(value={"Coprocesssor","Phoenix"})
public class CompressionContext
extends Object

Context that holds the various dictionaries for compression in WAL.

CompressionContexts are not expected to be shared among threads. Multithreaded use may produce unexpected results.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	CompressionContext.DictionaryIndex

Field Summary

Fields

Modifier and Type	Field and Description
static String	ENABLE_WAL_TAGS_COMPRESSION
static String	ENABLE_WAL_VALUE_COMPRESSION
static String	WAL_VALUE_COMPRESSION_TYPE

Constructor Summary

Constructors

Constructor and Description
CompressionContext(Class<? extends Dictionary> dictType, boolean recoveredEdits, boolean hasTagCompression)
CompressionContext(Class<? extends Dictionary> dictType, boolean recoveredEdits, boolean hasTagCompression, boolean hasValueCompression, Compression.Algorithm valueCompressionType)

Method Summary

Modifier and Type	Method and Description
Dictionary	getDictionary(Enum dictIndex)
static Compression.Algorithm	getValueCompressionAlgorithm(org.apache.hadoop.conf.Configuration conf)
org.apache.hadoop.hbase.regionserver.wal.CompressionContext.ValueCompressor	getValueCompressor()
boolean	hasTagCompression()
boolean	hasValueCompression()

Methods inherited from class java.lang.Object

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

Field Detail

ENABLE_WAL_TAGS_COMPRESSION

public static final String ENABLE_WAL_TAGS_COMPRESSION

See Also:

Constant Field Values

ENABLE_WAL_VALUE_COMPRESSION

public static final String ENABLE_WAL_VALUE_COMPRESSION

See Also:

Constant Field Values

WAL_VALUE_COMPRESSION_TYPE

public static final String WAL_VALUE_COMPRESSION_TYPE

See Also:

Constant Field Values

Constructor Detail

CompressionContext

public CompressionContext(Class<? extends Dictionary> dictType,
                          boolean recoveredEdits,
                          boolean hasTagCompression,
                          boolean hasValueCompression,
                          Compression.Algorithm valueCompressionType)
                   throws SecurityException,
                          NoSuchMethodException,
                          InstantiationException,
                          IllegalAccessException,
                          InvocationTargetException,
                          IOException

Throws:

SecurityException

NoSuchMethodException

InstantiationException

IllegalAccessException

InvocationTargetException

IOException

CompressionContext

public CompressionContext(Class<? extends Dictionary> dictType,
                          boolean recoveredEdits,
                          boolean hasTagCompression)
                   throws SecurityException,
                          NoSuchMethodException,
                          InstantiationException,
                          IllegalAccessException,
                          InvocationTargetException,
                          IOException

Throws:

SecurityException

NoSuchMethodException

InstantiationException

IllegalAccessException

InvocationTargetException

IOException

Method Detail

hasTagCompression

public boolean hasTagCompression()

hasValueCompression

public boolean hasValueCompression()

getDictionary

public Dictionary getDictionary(Enum dictIndex)

getValueCompressor

public org.apache.hadoop.hbase.regionserver.wal.CompressionContext.ValueCompressor getValueCompressor()

getValueCompressionAlgorithm

public static Compression.Algorithm getValueCompressionAlgorithm(org.apache.hadoop.conf.Configuration conf)