org.apache.cassandra.schema

Class SchemaKeyspace

java.lang.Object

org.apache.cassandra.schema.SchemaKeyspace

public final class SchemaKeyspace
extends java.lang.Object

system_schema.* tables and methods for manipulating them.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	AGGREGATES
static com.google.common.collect.ImmutableList<java.lang.String>	ALL The order in this list matters.
static java.lang.String	COLUMNS
static java.lang.String	DROPPED_COLUMNS
static java.lang.String	FUNCTIONS
static java.lang.String	INDEXES
static java.lang.String	KEYSPACES
static java.lang.String	TABLES
static java.lang.String	TRIGGERS
static java.lang.String	TYPES
static java.lang.String	VIEWS

Method Summary

Modifier and Type	Method and Description
static KeyspaceMetadata	metadata()
static void	saveSystemKeyspacesSchema() Add entries to system_schema.* for the hardcoded system keyspaces
static void	truncate()

Methods inherited from class java.lang.Object

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

Field Detail

KEYSPACES

public static final java.lang.String KEYSPACES

See Also:

Constant Field Values

TABLES

public static final java.lang.String TABLES

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Constant Field Values

COLUMNS

public static final java.lang.String COLUMNS

See Also:

Constant Field Values

DROPPED_COLUMNS

public static final java.lang.String DROPPED_COLUMNS

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Constant Field Values

TRIGGERS

public static final java.lang.String TRIGGERS

See Also:

Constant Field Values

VIEWS

public static final java.lang.String VIEWS

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Constant Field Values

TYPES

public static final java.lang.String TYPES

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Constant Field Values

FUNCTIONS

public static final java.lang.String FUNCTIONS

See Also:

Constant Field Values

AGGREGATES

public static final java.lang.String AGGREGATES

See Also:

Constant Field Values

INDEXES

public static final java.lang.String INDEXES

See Also:

Constant Field Values

ALL

public static final com.google.common.collect.ImmutableList<java.lang.String> ALL

The order in this list matters. When flushing schema tables, we want to flush them in a way that mitigates the effects of an abrupt shutdown whilst the tables are being flushed. On startup, we load the schema from disk before replaying the CL, so we need to try to avoid problems like reading a table without columns or types, for example. So columns and types should be flushed before tables, which should be flushed before keyspaces. When truncating, the order should be reversed. For immutable lists this is an efficient operation that simply iterates in reverse order. See CASSANDRA-12213 for more details.

Method Detail

metadata

public static KeyspaceMetadata metadata()

saveSystemKeyspacesSchema

public static void saveSystemKeyspacesSchema()

Add entries to system_schema.* for the hardcoded system keyspaces

truncate

public static void truncate()