Package io.debezium.connector.oracle.logminer.logwriter

Class RacCommitLogWriterFlushStrategy

java.lang.Object

io.debezium.connector.oracle.logminer.logwriter.RacCommitLogWriterFlushStrategy

All Implemented Interfaces:

LogWriterFlushStrategy, AutoCloseable

public class RacCommitLogWriterFlushStrategy
extends Object
implements LogWriterFlushStrategy

A LogWriterFlushStrategy for Oracle RAC that performs a transaction-scoped commit to flush the Oracle LogWriter (LGWR) process on each RAC node. This strategy builds atop of CommitLogWriterFlushStrategy by creating a commit strategy to each Oracle RAC node and orchestrating the flushes simultaneously for each node when a flush is needed. In the event that a node fails to flush, this strategy will delay for 3 seconds to allow Oracle to automatically flush the buffers before proceeding.

Author:

Chris Cranford

Field Summary

Fields

Modifier and Type	Field	Description
private Map<String,CommitLogWriterFlushStrategy>	flushStrategies
private Set<String>	hosts
private JdbcConfiguration	jdbcConfiguration
private static org.slf4j.Logger	LOGGER
private OracleStreamingChangeEventSourceMetrics	streamingMetrics

Fields inherited from interface io.debezium.connector.oracle.logminer.logwriter.LogWriterFlushStrategy

LOGMNR_FLUSH_TABLE

Constructor Summary

Constructors

Constructor	Description
RacCommitLogWriterFlushStrategy(OracleConnectorConfig connectorConfig, JdbcConfiguration jdbcConfig, OracleStreamingChangeEventSourceMetrics streamingMetrics)	Creates an Oracle RAC LogWriter (LGWR) flushing strategy.

Method Summary

Modifier and Type	Method	Description
void	close()
private void	closeRacNodeFlushStrategies()	Closes the RAC node flush strategies.
private CommitLogWriterFlushStrategy	createHostFlushStrategy(String hostName, Integer port)
void	flush(Scn currentScn)	Perform the Oracle LGWR process flush.
String	getHost()
private void	recreateRacNodeFlushStrategies()

Methods inherited from class java.lang.Object

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

Field Detail

LOGGER

private static final org.slf4j.Logger LOGGER

flushStrategies

private final Map<String,CommitLogWriterFlushStrategy> flushStrategies

streamingMetrics

private final OracleStreamingChangeEventSourceMetrics streamingMetrics

jdbcConfiguration

private final JdbcConfiguration jdbcConfiguration

hosts

private final Set<String> hosts

Constructor Detail

RacCommitLogWriterFlushStrategy

public RacCommitLogWriterFlushStrategy(OracleConnectorConfig connectorConfig,
                                       JdbcConfiguration jdbcConfig,
                                       OracleStreamingChangeEventSourceMetrics streamingMetrics)

Creates an Oracle RAC LogWriter (LGWR) flushing strategy.

Parameters:

connectorConfig - the connector configuration, must not be null

jdbcConfig - the mining session JDBC connection configuration, must not be null

streamingMetrics - the streaming metrics, must not be null

Method Detail

close

public void close()

Specified by:

close in interface AutoCloseable

getHost

public String getHost()

Specified by:

getHost in interface LogWriterFlushStrategy

Returns:

the host or ip address that will be flushed by the strategy

flush

public void flush(Scn currentScn)
           throws InterruptedException

Description copied from interface: LogWriterFlushStrategy

Perform the Oracle LGWR process flush.

Specified by:

flush in interface LogWriterFlushStrategy

Parameters:

currentScn - the current system change number

Throws:

InterruptedException

recreateRacNodeFlushStrategies

private void recreateRacNodeFlushStrategies()

createHostFlushStrategy

private CommitLogWriterFlushStrategy createHostFlushStrategy(String hostName,
                                                             Integer port)
                                                      throws SQLException

Throws:

SQLException

closeRacNodeFlushStrategies

private void closeRacNodeFlushStrategies()

Closes the RAC node flush strategies.