org.rhq.cassandra.schema

Class MigrateAggregateMetrics

java.lang.Object

org.rhq.cassandra.schema.MigrateAggregateMetrics

All Implemented Interfaces:

Step

public class MigrateAggregateMetrics
extends Object
implements Step

Migrates aggregate metrics from the one_hour_metrics, six_hour_metrics, and twenty_four_hour_metrics tables to the new aggregate_metrics table. The failure to migrate data for a single measurement schedule will result in an exception being thrown that causes the upgrade to fail; however, all schedules will be processed even if there are failures. An exception is thrown only after going through data for all schedules.

When data for a measurement schedule is successfully migrated, the schedule id is recorded in a log. There are separate log files for each of the 1 hour, 6 hour, and 24 hour tables. They are stored in the server data directory. Each table log is read prior to starting the migration to determine what schedule ids have data to be migrated.

After all data has been successfully migrated, the one_hour_metrics, six_hour_metrics, and twenty_four_hour_metrics tables are dropped.

Author:

John Sanda

Constructor Summary

Constructors

Constructor and Description
MigrateAggregateMetrics()

Method Summary

Methods

Modifier and Type	Method and Description
void	bind(Properties properties) Bind the set of provided properties to the input step.
void	execute() Perform the actual work of the step.
void	setSession(com.datastax.driver.core.Session session) Invoked prior to Step.execute().
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

MigrateAggregateMetrics

public MigrateAggregateMetrics()

Method Detail

setSession

public void setSession(com.datastax.driver.core.Session session)

Description copied from interface: Step

Invoked prior to Step.execute(). Note that this is the same session used by SchemaManager and it should not be closed.

Specified by:

setSession in interface Step

bind

public void bind(Properties properties)

Description copied from interface: Step

Bind the set of provided properties to the input step. The text should have all the variable to be bound in %variable_name% form.

This method should be called even if no properties are provided because it will throw a runtime exception if the text contains properties that are expected to be bound but the list of variable is either empty or does not contain them.

This method is invoked prior to Step.execute()

Specified by:

bind in interface Step

Parameters:

properties - properties to bind

toString

public String toString()

Overrides:

toString in class Object

execute

public void execute()

Description copied from interface: Step

Perform the actual work of the step.

Specified by:

execute in interface Step