Package io.debezium.connector.mysql.legacy

Class ParallelSnapshotReader

java.lang.Object

io.debezium.connector.mysql.legacy.ParallelSnapshotReader

All Implemented Interfaces:

Reader

public class ParallelSnapshotReader
extends Object
implements Reader

A reader that runs a ChainedReader consisting of a SnapshotReader and a BinlogReader for all tables newly added to the config in parallel with a BinlogReader for all the tables previously in the config.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static class	ParallelSnapshotReader.ParallelHaltingPredicate	A Halting Predicate for the parallel snapshot reader.

Nested classes/interfaces inherited from interface io.debezium.connector.mysql.legacy.Reader

Reader.State

Field Summary

Fields

Modifier and Type	Field	Description
private final AtomicBoolean	completed
private static final org.slf4j.Logger	LOGGER
private final BinlogReader	newTablesBinlogReader
private final ChainedReader	newTablesReader
private final BinlogReader	oldTablesReader
private final AtomicReference<MySqlPartition>	partition
private final AtomicBoolean	running
private final MySqlConnectorTask.ServerIdGenerator	serverIdGenerator
private final AtomicReference<Consumer<MySqlPartition>>	uponCompletion

Constructor Summary

Constructors

Constructor	Description
ParallelSnapshotReader(Configuration config, MySqlTaskContext noSnapshotContext, Filters snapshotFilters, MySqlConnectorTask.ServerIdGenerator serverIdGenerator)	Create a ParallelSnapshotReader.
ParallelSnapshotReader(BinlogReader oldTablesBinlogReader, SnapshotReader newTablesSnapshotReader, BinlogReader newTablesBinlogReader)

Method Summary

Modifier and Type	Method	Description
private void	completeSuccessfully(MySqlPartition partition)
ReconcilingBinlogReader	createReconcilingBinlogReader(BinlogReader unifiedReader)	Create and return a ReconcilingBinlogReader for the two binlog readers contained in this ParallelSnapshotReader.
void	initialize()	Perform any initialization of the reader before being started.
String	name()	Get the name of this reader.
List<org.apache.kafka.connect.source.SourceRecord>	poll()	Poll for the next batch of source records.
void	start(MySqlPartition partition)	Start the reader and return immediately.
Reader.State	state()	Get the current state of this reader.
void	stop()	Stop the reader from running and transition to the Reader.State.STOPPING state until all remaining records are consumed, at which point its state transitions to Reader.State.STOPPED.
void	uponCompletion(Consumer<MySqlPartition> handler)	Set the function that should be called when this reader transitions from the Reader.State.STOPPING to Reader.State.STOPPED state, which is after all generated records have been consumed via the poll method.

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.debezium.connector.mysql.legacy.Reader

destroy

Field Details

LOGGER

private static final org.slf4j.Logger LOGGER

oldTablesReader

private final BinlogReader oldTablesReader

newTablesBinlogReader

private final BinlogReader newTablesBinlogReader

newTablesReader

private final ChainedReader newTablesReader

partition

private final AtomicReference<MySqlPartition> partition

running

private final AtomicBoolean running

completed

private final AtomicBoolean completed

uponCompletion

private final AtomicReference<Consumer<MySqlPartition>> uponCompletion

serverIdGenerator

private final MySqlConnectorTask.ServerIdGenerator serverIdGenerator

Constructor Details

ParallelSnapshotReader

public ParallelSnapshotReader(Configuration config,
 MySqlTaskContext noSnapshotContext,
 Filters snapshotFilters,
 MySqlConnectorTask.ServerIdGenerator serverIdGenerator)

Create a ParallelSnapshotReader.

Parameters:

config - the current connector configuration.

noSnapshotContext - The context for those tables not undergoing a snapshot.

snapshotFilters - Filters matching the tables that should be snapshotted.

serverIdGenerator - a generator for creating unconflicting serverIds.

ParallelSnapshotReader

ParallelSnapshotReader(BinlogReader oldTablesBinlogReader,
 SnapshotReader newTablesSnapshotReader,
 BinlogReader newTablesBinlogReader)

Method Details

createReconcilingBinlogReader

public ReconcilingBinlogReader createReconcilingBinlogReader(BinlogReader unifiedReader)

Create and return a ReconcilingBinlogReader for the two binlog readers contained in this ParallelSnapshotReader.

Returns:

a ReconcilingBinlogReader

uponCompletion

public void uponCompletion(Consumer<MySqlPartition> handler)

Description copied from interface: Reader

Set the function that should be called when this reader transitions from the Reader.State.STOPPING to Reader.State.STOPPED state, which is after all generated records have been consumed via the poll method.

This method should only be called while the reader is in the Reader.State.STOPPED state.

Specified by:

uponCompletion in interface Reader

Parameters:

handler - the function; may not be null

initialize

public void initialize()

Description copied from interface: Reader

Perform any initialization of the reader before being started. This method should be called exactly once before Reader.start(MySqlPartition) ()} is called, and it should block until all initialization is completed.

Specified by:

initialize in interface Reader

start

public void start(MySqlPartition partition)

Description copied from interface: Reader

Start the reader and return immediately. Once started, the SourceRecords generated by the reader can be obtained by periodically calling Reader.poll() until that method returns null.

This method does nothing if it is already running.

Specified by:

start in interface Reader

stop

public void stop()

Description copied from interface: Reader

Stop the reader from running and transition to the Reader.State.STOPPING state until all remaining records are consumed, at which point its state transitions to Reader.State.STOPPED.

Specified by:

stop in interface Reader

state

public Reader.State state()

Description copied from interface: Reader

Get the current state of this reader.

Specified by:

state in interface Reader

Returns:

the state; never null

poll

public List<org.apache.kafka.connect.source.SourceRecord> poll()
                                                        throws InterruptedException

Description copied from interface: Reader

Poll for the next batch of source records. This method returns null only when all records generated by this reader have been processed, following the natural or explicit stopping of this reader. Note that this method may block if no additional records are available but the reader may produce more, thus callers should call this method continually until this method returns null.

Specified by:

poll in interface Reader

Returns:

the list of source records that may or may not be empty; or null when there will be no more records because the reader has completely Reader.State.STOPPED.

Throws:

InterruptedException - if this thread is interrupted while waiting for more records

completeSuccessfully

private void completeSuccessfully(MySqlPartition partition)

name

public String name()

Description copied from interface: Reader

Get the name of this reader.

Specified by:

name in interface Reader

Returns:

the reader's name; never null