Package org.apache.cassandra.db

Class SizeEstimatesRecorder

java.lang.Object

org.apache.cassandra.db.SizeEstimatesRecorder

All Implemented Interfaces:

Runnable, SchemaChangeListener

public class SizeEstimatesRecorder
extends Object
implements SchemaChangeListener, Runnable

A very simplistic/crude partition count/size estimator. Exposing per-primary-range estimated partitions count and size in CQL form. Estimates (per primary range) are calculated and dumped into a system table (system.size_estimates) every 5 minutes. See CASSANDRA-7688.

Field Summary

Fields

Modifier and Type	Field	Description
static final SizeEstimatesRecorder	instance

Method Summary

Modifier and Type	Method	Description
void	onDropTable(TableMetadata table, boolean dropData)
void	run()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cassandra.schema.SchemaChangeListener

onAlterAggregate, onAlterFunction, onAlterKeyspace, onAlterTable, onAlterType, onAlterView, onCreateAggregate, onCreateFunction, onCreateKeyspace, onCreateTable, onCreateType, onCreateView, onDropAggregate, onDropFunction, onDropKeyspace, onDropType, onDropView, onPreAlterTable, onPreAlterView

Field Details

instance

public static final SizeEstimatesRecorder instance

Method Details

run

public void run()

Specified by:

run in interface Runnable

onDropTable

public void onDropTable(TableMetadata table,
 boolean dropData)

Specified by:

onDropTable in interface SchemaChangeListener