org.apache.cassandra.db

Class SizeEstimatesRecorder

java.lang.Object

org.apache.cassandra.schema.SchemaChangeListener

org.apache.cassandra.db.SizeEstimatesRecorder

All Implemented Interfaces:

java.lang.Runnable

public class SizeEstimatesRecorder
extends SchemaChangeListener
implements java.lang.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 and Description
static SizeEstimatesRecorder	instance

Method Summary

Modifier and Type	Method and Description
void	onDropTable(java.lang.String keyspace, java.lang.String table)
void	run()

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

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

Methods inherited from class java.lang.Object

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

Field Detail

instance

public static final SizeEstimatesRecorder instance

Method Detail

run

public void run()

Specified by:

run in interface java.lang.Runnable

onDropTable

public void onDropTable(java.lang.String keyspace,
                        java.lang.String table)

Overrides:

onDropTable in class SchemaChangeListener