com.datastax.driver.core.schemabuilder

Class TableOptions.CompressionOptions

java.lang.Object

com.datastax.driver.core.schemabuilder.TableOptions.CompressionOptions

Direct Known Subclasses:

TableOptions.CompressionOptions.NoCompression

Enclosing class:

TableOptions<T extends TableOptions>

public static class TableOptions.CompressionOptions
extends Object

The compression options for a CREATE or ALTER TABLE statement.

To create instances, use SchemaBuilder.noCompression(), SchemaBuilder.lz4(), SchemaBuilder.snappy() or SchemaBuilder.deflate().

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	TableOptions.CompressionOptions.Algorithm Compression algorithms.
static class	TableOptions.CompressionOptions.NoCompression

Method Summary

Modifier and Type	Method and Description
String	build()
TableOptions.CompressionOptions	withChunkLengthInKb(Integer chunkLengthInKb) On disk, SSTables are compressed by block to allow random reads.
TableOptions.CompressionOptions	withCRCCheckChance(Double crcCheckChance) When compression is enabled, each compressed block includes a checksum of that block for the purpose of detecting disk bitrate and avoiding the propagation of corruption to other replica.

Methods inherited from class java.lang.Object

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

Method Detail

withChunkLengthInKb

public TableOptions.CompressionOptions withChunkLengthInKb(Integer chunkLengthInKb)

On disk, SSTables are compressed by block to allow random reads. This subproperty of compression defines the size (in KB) of the block. Values larger than the default value might improve the compression rate, but increases the minimum size of data to be read from disk when a read occurs. The default value is a good middle-ground for compressing tables. Adjust compression size to account for read/write access patterns (how much data is typically requested at once) and the average size of rows in the table.

If no call is made to this method, the default value set by Cassandra is 54.

Parameters:

chunkLengthInKb - the new value.

Returns:

this object (for call chaining).

withCRCCheckChance

public TableOptions.CompressionOptions withCRCCheckChance(Double crcCheckChance)

When compression is enabled, each compressed block includes a checksum of that block for the purpose of detecting disk bitrate and avoiding the propagation of corruption to other replica. This option defines the probability with which those checksums are checked during read. By default they are always checked. Set to 0 to disable checksum checking and to 0.5, for instance, to check them on every other read.

If no call is made to this method, the default value set by Cassandra is 1.0 (always check).

Parameters:

crcCheckChance - the new value.

Returns:

this object (for call chaining).

build

public String build()