[
https://issues.apache.org/jira/browse/NIFI-3413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15941184#comment-15941184
]
ASF GitHub Bot commented on NIFI-3413:
--------------------------------------
Github user phrocker commented on a diff in the pull request:
https://github.com/apache/nifi/pull/1618#discussion_r107921926
--- Diff:
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/GetChangeDataCaptureMySQL.java
---
@@ -0,0 +1,879 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.nifi.processors.standard;
+
+import com.github.shyiko.mysql.binlog.BinaryLogClient;
+import com.github.shyiko.mysql.binlog.event.Event;
+import com.github.shyiko.mysql.binlog.event.EventHeaderV4;
+import com.github.shyiko.mysql.binlog.event.EventType;
+import com.github.shyiko.mysql.binlog.event.QueryEventData;
+import com.github.shyiko.mysql.binlog.event.RotateEventData;
+import com.github.shyiko.mysql.binlog.event.TableMapEventData;
+import org.apache.nifi.annotation.behavior.DynamicProperties;
+import org.apache.nifi.annotation.behavior.DynamicProperty;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.Stateful;
+import org.apache.nifi.annotation.behavior.TriggerSerially;
+import org.apache.nifi.annotation.behavior.WritesAttribute;
+import org.apache.nifi.annotation.behavior.WritesAttributes;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.annotation.lifecycle.OnScheduled;
+import org.apache.nifi.annotation.lifecycle.OnStopped;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.PropertyValue;
+import org.apache.nifi.components.state.Scope;
+import org.apache.nifi.components.state.StateManager;
+import org.apache.nifi.components.state.StateMap;
+import org.apache.nifi.distributed.cache.client.Deserializer;
+import org.apache.nifi.distributed.cache.client.DistributedMapCacheClient;
+import org.apache.nifi.distributed.cache.client.Serializer;
+import org.apache.nifi.logging.ComponentLog;
+import org.apache.nifi.processor.AbstractSessionFactoryProcessor;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processor.ProcessSessionFactory;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.processors.standard.db.CDCException;
+import org.apache.nifi.processors.standard.db.event.ColumnDefinition;
+import org.apache.nifi.processors.standard.db.event.RowEventException;
+import org.apache.nifi.processors.standard.db.event.TableInfo;
+import org.apache.nifi.processors.standard.db.event.TableInfoCacheKey;
+import org.apache.nifi.processors.standard.db.event.io.EventWriter;
+import
org.apache.nifi.processors.standard.db.impl.mysql.event.BeginTransactionEventInfo;
+import org.apache.nifi.processors.standard.db.impl.mysql.RawBinlogEvent;
+import
org.apache.nifi.processors.standard.db.impl.mysql.BinlogEventListener;
+import
org.apache.nifi.processors.standard.db.impl.mysql.event.BinlogEventInfo;
+import
org.apache.nifi.processors.standard.db.impl.mysql.event.CommitTransactionEventInfo;
+import
org.apache.nifi.processors.standard.db.impl.mysql.event.DeleteRowsEventInfo;
+import
org.apache.nifi.processors.standard.db.impl.mysql.event.SchemaChangeEventInfo;
+import
org.apache.nifi.processors.standard.db.impl.mysql.event.UpdateRowsEventInfo;
+import
org.apache.nifi.processors.standard.db.impl.mysql.event.InsertRowsEventInfo;
+import
org.apache.nifi.processors.standard.db.impl.mysql.event.io.BeginTransactionEventWriter;
+import
org.apache.nifi.processors.standard.db.impl.mysql.event.io.CommitTransactionEventWriter;
+import
org.apache.nifi.processors.standard.db.impl.mysql.event.io.DeleteRowsWriter;
+import
org.apache.nifi.processors.standard.db.impl.mysql.event.io.InsertRowsWriter;
+import
org.apache.nifi.processors.standard.db.impl.mysql.event.io.SchemaChangeEventWriter;
+import
org.apache.nifi.processors.standard.db.impl.mysql.event.io.UpdateRowsWriter;
+import org.apache.nifi.reporting.InitializationException;
+import org.apache.nifi.util.StringUtils;
+import org.apache.nifi.util.file.classloader.ClassLoaderUtils;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.net.MalformedURLException;
+import java.sql.Connection;
+import java.sql.Driver;
+import java.sql.DriverManager;
+import java.sql.DriverPropertyInfo;
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.SQLFeatureNotSupportedException;
+import java.sql.Statement;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+import java.util.Set;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.logging.Logger;
+import java.util.regex.Pattern;
+
+/**
+ * A processor to retrieve Change Data Capture (CDC) events and send them
as flow files.
+ */
+@TriggerSerially
+@InputRequirement(InputRequirement.Requirement.INPUT_FORBIDDEN)
+@Tags({"sql", "jdbc", "cdc", "mysql"})
+@CapabilityDescription("Retrieves Change Data Capture (CDC) events from a
MySQL database. CDC Events include INSERT, UPDATE, DELETE operations. Events "
+ + "are output as individual flow files ordered by the time at
which the operation occurred.")
+@Stateful(scopes = Scope.LOCAL, description = "Information such as a
'pointer' to the current CDC event in the database is stored by this processor,
such "
+ + "that it can continue from the same location if restarted.")
+@DynamicProperties({
+ @DynamicProperty(
+ name = "init.binlog.filename",
+ value = "The binlog filename to start from",
+ description = "Specifies the name of the binlog file from
which to begin retrieving CDC records."
+ ),
+ @DynamicProperty(
+ name = "init.binlog.position",
+ value = "The offset into the initial binlog file to start
from",
+ description = "Specifies the offset into the initial
binlog file from which to begin retrieving CDC records."
+ )
+})
+@WritesAttributes({
+ @WritesAttribute(attribute = "cdc.sequence.id", description = "A
sequence identifier (i.e. strictly increasing integer value) specifying the
order "
+ + "of the CDC event flow file relative to the other event
flow file(s)."),
+ @WritesAttribute(attribute = "cdc.event.type", description = "A
string indicating the type of CDC event that occurred, including (but not
limited to) "
+ + "'begin', 'write', 'update', 'delete', 'schema_change'
and 'commit'."),
+ @WritesAttribute(attribute = "mime.type", description = "The
processor outputs flow file content in JSON format, and sets the mime.type
attribute to "
+ + "application/json")
+})
+public class GetChangeDataCaptureMySQL extends
AbstractSessionFactoryProcessor {
+
+ // Relationships
+ public static final Relationship REL_SUCCESS = new
Relationship.Builder()
+ .name("success")
+ .description("Successfully created FlowFile from SQL query
result set.")
+ .build();
+
+ protected static Set<Relationship> relationships;
+
+ // Properties
+ public static final PropertyDescriptor DATABASE_NAME_PATTERN = new
PropertyDescriptor.Builder()
+ .name("get-cdc-mysql-db-name-pattern")
+ .displayName("Database/Schema Name Pattern")
+ .description("A regular expression (regex) for matching
databases or schemas (depending on your RDBMS' terminology) against the list of
CDC events. The regex must match "
+ + "the schema name as it is stored in the database. If
the property is not set, the schema name will not be used to filter the CDC
events.")
+ .required(false)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+
+ public static final PropertyDescriptor TABLE_NAME_PATTERN = new
PropertyDescriptor.Builder()
+ .name("get-cdc-mysql-name-pattern")
+ .displayName("Table Name Pattern")
+ .description("A regular expression (regex) for matching CDC
events affecting matching tables. The regex must match the table name as it is
stored in the database. "
+ + "If the property is not set, no events will be
filtered based on table name.")
+ .required(false)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+
+ public static final PropertyDescriptor CONNECT_TIMEOUT = new
PropertyDescriptor.Builder()
+ .name("get-cdc-mysql-max-wait-time")
+ .displayName("Max Wait Time")
+ .description("The maximum amount of time allowed for a
connection to be established, "
+ + "zero means there is effectively no limit. Max time
less than 1 second will be equal to zero.")
+ .defaultValue("0 seconds")
+ .required(true)
+ .addValidator(StandardValidators.TIME_PERIOD_VALIDATOR)
+ .expressionLanguageSupported(true)
+ .build();
+
+ public static final PropertyDescriptor HOSTS = new
PropertyDescriptor.Builder()
+ .name("get-cdc-mysql-hosts")
+ .displayName("MySQL Hosts")
+ .description("A list of hostname/port entries corresponding to
nodes in a MySQL cluster. The entries should be comma separated "
+ + "using a colon such as host1:port,host2:port,....
For example mysql.myhost.com:3306. This processor will attempt to connect to "
+ + "the hosts in the list in order. If one node goes
down and failover is enabled for the cluster, then the processor will connect "
+ + "to the active node (assuming its host entry is
specified in this property. The default port for MySQL connections is 3306.")
+ .required(true)
+ .expressionLanguageSupported(false)
+ .addValidator(StandardValidators.HOSTNAME_PORT_LIST_VALIDATOR)
+ .expressionLanguageSupported(true)
+ .build();
+
+ public static final PropertyDescriptor DRIVER_NAME = new
PropertyDescriptor.Builder()
+ .name("get-cdc-mysql-driver-class")
+ .displayName("MySQL Driver Class Name")
+ .description("The class name of the MySQL database driver
class")
+ .defaultValue("com.mysql.jdbc.Driver")
+ .required(true)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .expressionLanguageSupported(true)
+ .build();
+
+ public static final PropertyDescriptor DRIVER_LOCATION = new
PropertyDescriptor.Builder()
+ .name("get-cdc-mysql-driver-locations")
+ .displayName("MySQL Driver Location(s)")
+ .description("Comma-separated list of files/folders and/or
URLs containing the MySQL driver JAR and its dependencies (if any). "
+ + "For example
'/var/tmp/mysql-connector-java-5.1.38-bin.jar'")
+ .defaultValue(null)
+ .required(false)
+ .addValidator(StandardValidators.createListValidator(true,
true, StandardValidators.createURLorFileValidator()))
+ .expressionLanguageSupported(true)
+ .build();
+
+ public static final PropertyDescriptor USERNAME = new
PropertyDescriptor.Builder()
+ .name("get-cdc-mysql-username")
+ .displayName("Username")
+ .description("Username to access the MySQL cluster")
+ .required(false)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .expressionLanguageSupported(true)
+ .build();
+
+ public static final PropertyDescriptor PASSWORD = new
PropertyDescriptor.Builder()
+ .name("get-cdc-mysql-password")
+ .displayName("Password")
+ .description("Password to access the MySQL cluster")
+ .required(false)
+ .sensitive(true)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .expressionLanguageSupported(true)
+ .build();
+
+ public static final PropertyDescriptor DIST_CACHE_CLIENT = new
PropertyDescriptor.Builder()
+ .name("get-cdc-mysql-dist-map-cache-client")
+ .displayName("Distributed Map Cache Client")
+ .description("Identifies a Distributed Map Cache Client
controller service to be used for keeping information about the various tables,
columns, etc. "
+ + "needed by the processor. If a client is not
specified, the generated events will not include column type or name
information.")
+ .identifiesControllerService(DistributedMapCacheClient.class)
+ .required(false)
+ .build();
+
+ public static final PropertyDescriptor RETRIEVE_ALL_RECORDS = new
PropertyDescriptor.Builder()
+ .name("get-cdc-mysql-retrieve-all-records")
+ .displayName("Retrieve All Records")
+ .description("Specifies whether to get all available CDC
events, regardless of the current binlog filename and/or position. If this
property is set to true, "
+ + "any init.binlog.filename and init.binlog.position
dynamic properties are ignored. NOTE: If binlog filename and position values
are present in the processor's "
+ + "State Map, this property's value is ignored. To
reset the behavior, clear the processor state (refer to the State Management
section of the processor's documentation.")
+ .required(true)
+ .allowableValues("true", "false")
+ .defaultValue("true")
+ .addValidator(StandardValidators.BOOLEAN_VALIDATOR)
+ .build();
+
+ public static final PropertyDescriptor INIT_SEQUENCE_ID = new
PropertyDescriptor.Builder()
+ .name("get-cdc-mysql-init-seq-id")
+ .displayName("Initial Sequence ID")
+ .description("Specifies an initial sequence identifier to use
if this processor's State does not have a current "
+ + "sequence identifier. If a sequence identifier is
present in the processor's State, this property is ignored. Sequence
identifiers are "
+ + "monotonically increasing integers that record the
order of flow files generated by the processor. They can be used with the
EnforceOrder "
+ + "processor to guarantee ordered delivery of CDC
events.")
+ .required(false)
+
.addValidator(StandardValidators.NON_NEGATIVE_INTEGER_VALIDATOR)
+ .expressionLanguageSupported(true)
+ .build();
+
+ public static final PropertyDescriptor INIT_BINLOG_FILENAME = new
PropertyDescriptor.Builder()
+ .name("get-cdc-mysql-init-binlog-filename")
+ .displayName("Initial Binlog Filename")
+ .description("Specifies an initial binlog filename to use if
this processor's State does not have a current binlog filename. If a filename
is present "
+ + "in the processor's State, this property is ignored.
This can be used along with Initial Binlog Position to \"skip ahead\" if
previous events are not desired. "
+ + "Note that NiFi Expression Language is supported,
but this property is evaluated when the processor is configured, so FlowFile
attributes may not be used. Expression "
+ + "Language is supported to enable the use of the
Variable Registry and/or environment properties.")
+ .required(false)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .expressionLanguageSupported(true)
+ .build();
+
+ public static final PropertyDescriptor INIT_BINLOG_POSITION = new
PropertyDescriptor.Builder()
+ .name("get-cdc-mysql-init-binlog-position")
+ .displayName("Initial Binlog Position")
+ .description("Specifies an initial offset into a binlog
(specified by Initial Binlog Filename) to use if this processor's State does
not have a current "
+ + "binlog filename. If a filename is present in the
processor's State, this property is ignored. This can be used along with
Initial Binlog Filename "
+ + "to \"skip ahead\" if previous events are not
desired. Note that NiFi Expression Language is supported, but this property is
evaluated when the "
+ + "processor is configured, so FlowFile attributes may
not be used. Expression Language is supported to enable the use of the Variable
Registry "
+ + "and/or environment properties.")
+ .required(false)
+
.addValidator(StandardValidators.NON_NEGATIVE_INTEGER_VALIDATOR)
+ .expressionLanguageSupported(true)
+ .build();
+
+ private static List<PropertyDescriptor> propDescriptors;
+
+ private volatile ProcessSession currentSession;
+ private BinaryLogClient binlogClient;
+ private volatile LinkedBlockingQueue<RawBinlogEvent> queue = new
LinkedBlockingQueue<>();
+ private volatile String currentBinlogFile = null;
+ private volatile long currentBinlogPosition = 4;
+
+ // The following variables save the value of the binlog filename and
position (and sequence id) at the beginning of a transaction. Used for rollback
+ private volatile String xactBinlogFile = null;
+ private volatile long xactBinlogPosition = 4;
+ private volatile long xactSequenceId = 0;
+
+ private volatile TableInfo currentTable = null;
+ private volatile Pattern databaseNamePattern;
+ private volatile Pattern tableNamePattern;
+
+ private volatile boolean inTransaction = false;
+ private volatile boolean skipTable = false;
+ private AtomicBoolean doStop = new AtomicBoolean(false);
+
+ private int currentHost = 0;
+
+ private AtomicLong currentSequenceId = new AtomicLong(0);
+
+ private volatile DistributedMapCacheClient cacheClient = null;
+ private final Serializer<TableInfoCacheKey> cacheKeySerializer = new
TableInfoCacheKey.Serializer();
+ private final Serializer<TableInfo> cacheValueSerializer = new
TableInfo.Serializer();
+ private final Deserializer<TableInfo> cacheValueDeserializer = new
TableInfo.Deserializer();
+
+ private Connection jdbcConnection = null;
+
+ private static final BeginTransactionEventWriter beginEventWriter =
new BeginTransactionEventWriter();
+ private static final CommitTransactionEventWriter commitEventWriter =
new CommitTransactionEventWriter();
+ private static final SchemaChangeEventWriter schemaChangeEventWriter =
new SchemaChangeEventWriter();
+ private static final InsertRowsWriter insertRowsWriter = new
InsertRowsWriter();
+ private static final DeleteRowsWriter deleteRowsWriter = new
DeleteRowsWriter();
+ private static final UpdateRowsWriter updateRowsWriter = new
UpdateRowsWriter();
+
+ static {
+
+ final Set<Relationship> r = new HashSet<>();
+ r.add(REL_SUCCESS);
+ relationships = Collections.unmodifiableSet(r);
+
+ final List<PropertyDescriptor> pds = new ArrayList<>();
+ pds.add(HOSTS);
+ pds.add(DRIVER_NAME);
+ pds.add(DRIVER_LOCATION);
+ pds.add(USERNAME);
+ pds.add(PASSWORD);
+ pds.add(DATABASE_NAME_PATTERN);
+ pds.add(TABLE_NAME_PATTERN);
+ pds.add(CONNECT_TIMEOUT);
+ pds.add(DIST_CACHE_CLIENT);
+ pds.add(RETRIEVE_ALL_RECORDS);
+ pds.add(INIT_SEQUENCE_ID);
+ propDescriptors = Collections.unmodifiableList(pds);
+ }
+
+
+ @Override
+ public Set<Relationship> getRelationships() {
+ return relationships;
+ }
+
+ @Override
+ protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
+ return propDescriptors;
+ }
+
+ @Override
+ protected PropertyDescriptor
getSupportedDynamicPropertyDescriptor(final String propertyDescriptorName) {
+ if (INIT_BINLOG_FILENAME.getName().equals(propertyDescriptorName))
{
+ return INIT_BINLOG_FILENAME;
+ }
+ if (INIT_BINLOG_POSITION.getName().equals(propertyDescriptorName))
{
+ return INIT_BINLOG_POSITION;
+ }
+ return null;
+ }
+
+ @OnScheduled
+ public void setup(ProcessContext context) {
+
+ final ComponentLog logger = getLogger();
+
+ final StateManager stateManager = context.getStateManager();
+ final StateMap stateMap;
+
+ try {
+ stateMap = stateManager.getState(Scope.LOCAL);
+ } catch (final IOException ioe) {
+ logger.error("Failed to retrieve observed maximum values from
the State Manager. Will not attempt "
+ + "connection until this is accomplished.", ioe);
+ context.yield();
+ return;
+ }
+
+ Map<String, String> statePropertiesMap = new
HashMap<>(stateMap.toMap());
+
+ // Pre-store initial sequence ID if none has been set in the state
map
+ final PropertyValue initSequenceId =
context.getProperty(INIT_SEQUENCE_ID);
+ statePropertiesMap.computeIfAbsent(EventWriter.SEQUENCE_ID_KEY, k
-> initSequenceId.isSet() ?
initSequenceId.evaluateAttributeExpressions().getValue() : "0");
+
+
+ boolean getAllRecords =
context.getProperty(RETRIEVE_ALL_RECORDS).asBoolean();
+
+ // Set current binlog filename to whatever is in State, falling
back to the Retrieve All Records then Initial Binlog Filename, if no State
variable is present
+ currentBinlogFile =
stateMap.get(BinlogEventInfo.BINLOG_FILENAME_KEY);
+ if (StringUtils.isEmpty(currentBinlogFile)) {
+ if (!getAllRecords &&
context.getProperty(INIT_BINLOG_FILENAME).isSet()) {
+ currentBinlogFile =
context.getProperty(INIT_BINLOG_FILENAME).evaluateAttributeExpressions().getValue();
+ } else {
+ // If we're starting from the beginning of all binlogs,
the binlog filename must be the empty string (not null)
+ currentBinlogFile = "";
+ }
+ }
+
+ // Set current binlog position to whatever is in State, falling
back to the Retrieve All Records then Initial Binlog Filename, if no State
variable is present
+ String binlogPosition =
stateMap.get(BinlogEventInfo.BINLOG_POSITION_KEY);
+ if (!StringUtils.isEmpty(binlogPosition)) {
+ currentBinlogPosition = Long.valueOf(binlogPosition);
+ } else if (!getAllRecords &&
context.getProperty(INIT_BINLOG_POSITION).isSet()) {
+ currentBinlogPosition =
context.getProperty(INIT_BINLOG_POSITION).evaluateAttributeExpressions().asLong();
+ }
+
+ // Get current sequence ID from state
+ String seqIdString = stateMap.get(EventWriter.SEQUENCE_ID_KEY);
+ if (StringUtils.isEmpty(seqIdString)) {
+ // Use Initial Sequence ID property if none is found in state
+ PropertyValue seqIdProp =
context.getProperty(GetChangeDataCaptureMySQL.INIT_SEQUENCE_ID);
+ if (seqIdProp.isSet()) {
+
currentSequenceId.set(seqIdProp.evaluateAttributeExpressions().asInteger());
+ }
+ } else {
+ currentSequenceId.set(Integer.parseInt(seqIdString));
+ }
+
+ // Get reference to Distributed Cache if one exists. If it does
not, no enrichment (resolution of column names, e.g.) will be performed
+ boolean createEnrichmentConnection = false;
+ if
(context.getProperty(GetChangeDataCaptureMySQL.DIST_CACHE_CLIENT).isSet()) {
+ cacheClient =
context.getProperty(GetChangeDataCaptureMySQL.DIST_CACHE_CLIENT).asControllerService(DistributedMapCacheClient.class);
+ createEnrichmentConnection = true;
+ } else {
+ logger.warn("No Distributed Map Cache Client is specified, so
no event enrichment (resolution of column names, e.g.) will be performed.");
+ }
+
+
+ // Save off MySQL cluster and JDBC driver information, will be
used to connect for event enrichment as well as for the binlog connector
+ try {
+ List<InetSocketAddress> hosts =
getHosts(context.getProperty(HOSTS).evaluateAttributeExpressions().getValue());
+
+ String username =
context.getProperty(USERNAME).evaluateAttributeExpressions().getValue();
+ String password =
context.getProperty(PASSWORD).evaluateAttributeExpressions().getValue();
+
+ long connectTimeout =
context.getProperty(GetChangeDataCaptureMySQL.CONNECT_TIMEOUT).evaluateAttributeExpressions().asTimePeriod(TimeUnit.MILLISECONDS);
+
+ String driverLocation =
context.getProperty(DRIVER_LOCATION).evaluateAttributeExpressions().getValue();
+ String driverName =
context.getProperty(DRIVER_NAME).evaluateAttributeExpressions().getValue();
+
+ connect(hosts, username, password, createEnrichmentConnection,
driverLocation, driverName, connectTimeout);
+ } catch (IOException ioe) {
+ context.yield();
+ throw new ProcessException(ioe);
+ }
+
+ PropertyValue dbNameValue =
context.getProperty(DATABASE_NAME_PATTERN);
+ databaseNamePattern = dbNameValue.isSet() ?
Pattern.compile(dbNameValue.getValue()) : null;
+
+ PropertyValue tableNameValue =
context.getProperty(TABLE_NAME_PATTERN);
+ tableNamePattern = tableNameValue.isSet() ?
Pattern.compile(tableNameValue.getValue()) : null;
+ }
+
+
+ @Override
+ public void onTrigger(ProcessContext context, ProcessSessionFactory
sessionFactory) throws ProcessException {
+ if (currentSession == null) {
+ currentSession = sessionFactory.createSession();
+ }
+
+ ComponentLog log = getLogger();
+
+ try {
+ outputEvents(currentSession, log);
+ } catch (IOException ioe) {
+ try {
+ // Perform some processor-level "rollback"
+ currentBinlogFile = xactBinlogFile == null ? "" :
xactBinlogFile;
+ currentBinlogPosition = xactBinlogPosition;
+ currentSequenceId.set(xactSequenceId);
+ inTransaction = false;
+ stop(context.getStateManager());
+ queue.clear();
+ } catch (Exception e) {
+ // Not much we can recover from here
+ }
+ throw new ProcessException(ioe);
+ }
+ }
+
+ @OnStopped
+ public void onStopped(ProcessContext context) {
+ try {
+ stop(context.getStateManager());
+ } catch (CDCException ioe) {
+ throw new ProcessException(ioe);
+ }
+ }
+
+ /**
+ * Get a list of hosts from a NiFi property, e.g.
+ *
+ * @param hostsString A comma-separated list of hosts
(host:port,host2:port2, etc.)
+ * @return List of InetSocketAddresses for the hosts
+ */
+ private List<InetSocketAddress> getHosts(String hostsString) {
+
+ if (hostsString == null) {
+ return null;
+ }
+ final List<String> hostsSplit =
Arrays.asList(hostsString.split(","));
--- End diff --
Do you expect hosts to be of any large size that might benefit from caching
hostnames to InetSocketAddress objects? My gut reaction is that it isn't
necessary since hosts probably won't be enough to impact start/restart
> Implement a GetChangeDataCapture processor
> ------------------------------------------
>
> Key: NIFI-3413
> URL: https://issues.apache.org/jira/browse/NIFI-3413
> Project: Apache NiFi
> Issue Type: New Feature
> Components: Extensions
> Reporter: Matt Burgess
> Assignee: Matt Burgess
>
> Database systems such as MySQL, Oracle, and SQL Server allow access to their
> transactional logs and such, in order for external clients to have a "change
> data capture" (CDC) capability. I propose a GetChangeDataCapture processor to
> enable this in NiFi.
> The processor would be configured with a DBCPConnectionPool controller
> service, as well as a Database Type property (similar to the one in
> QueryDatabaseTable) for database-specific handling. Additional properties
> might include the CDC table name, etc. Additional database-specific
> properties could be handled using dynamic properties (and the documentation
> should reflect this).
> The processor would accept no incoming connections (it is a "Get" or source
> processor), would be intended to run on the primary node only as a single
> threaded processor, and would generate a flow file for each operation
> (INSERT, UPDATE, DELETE, e,g,) in one or some number of formats (JSON, e.g.).
> The flow files would be transferred in time order (to enable a replication
> solution, for example), perhaps with some auto-incrementing attribute to also
> indicate order if need be.
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