Package org.apache.cassandra.tracing

Class TraceKeyspace

java.lang.Object

org.apache.cassandra.tracing.TraceKeyspace

public final class TraceKeyspace
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static final String	EVENTS
static final long	GENERATION	Generation is used as a timestamp for automatic table creation on startup.
static final String	SESSIONS
static final Set<String>	TABLE_NAMES

Method Summary

Modifier and Type	Method	Description
static KeyspaceMetadata	metadata()

Methods inherited from class java.lang.Object

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

Field Details

GENERATION

public static final long GENERATION

Generation is used as a timestamp for automatic table creation on startup. If you make any changes to the tables below, make sure to increment the generation and document your change here. gen 1577836800000000: (3.0) maps to Jan 1 2020; an arbitrary cut-off date by which we assume no nodes older than 2.0.2 will ever start; see the note below for why this is necessary; actual change in 3.0: removed default ttl, reduced bloom filter fp chance from 0.1 to 0.01. gen 1577836800000001: (pre-)adds coordinator_port column to sessions and source_port column to events in 3.0, 3.11, 4.0 gen 1577836800000002: compression chunk length reduced to 16KiB, memtable_flush_period_in_ms now unset on all tables in 4.0 * Until CASSANDRA-6016 (Oct 13, 2.0.2) and in all of 1.2, we used to create system_traces keyspace and tables in the same way that we created the purely local 'system' keyspace - using current time on node bounce (+1). For new definitions to take, we need to bump the generation further than that.

See Also:

• Constant Field Values

SESSIONS

public static final String SESSIONS

See Also:

• Constant Field Values

EVENTS

public static final String EVENTS

See Also:

• Constant Field Values

TABLE_NAMES

public static final Set<String> TABLE_NAMES

Method Details

metadata

public static KeyspaceMetadata metadata()