GridGain Handler

Prerequisites

JDK 8.x

Install GoldenGate

Download GoldenGate for Big Data.
Extract the distribution and navigate to its root directory.
Check that GoldenGate is working by running Command Interpreter (ggsci).

Run Java Handler

Launch GoldenGate Command Interpreter (ggsci).
Verify that Manager is running:
```
info manager
```
If the manager has stopped, start it:
```
start manager
```
Run the following command to start creating configuration for the replicat process (a.k.a. javarepl):
```
edit params javarepl
```
Copy the GridGain GoldenGate connector directory (available in integration/gridgain-goldengate-19) from the GridGain distribution to the GoldenGate distribution under ggjava/lib.

Example configuration for the replicat process:
```
REPLICAT javarepl
TARGETDB LIBFILE libggjava.so SET property=dirprm/javarepl.props
REPORTCOUNT EVERY 1 MINUTES, RATE
GROUPTRANSOPS 1000
MAP MYSCHEMA.*, TARGET MYSCHEMA.*;
```

Create an additional configuration file for Java runtime in the dirprm directory, next to javarepl.prm created in the previous step:

#javarepl.props
gg.handlerlist=gridgain
gg.handler.gridgain.type=org.gridgain.oracle.goldengate.GridGainHandler
gg.handler.gridgain.configurationPath=dirprm/gridgain-config.xml
gg.handler.gridgain.operationHandlerBeanName=fooHandler

goldengate.userexit.writers=javawriter
javawriter.stats.display=TRUE
javawriter.stats.full=TRUE
gg.log=log4j
gg.log.level=INFO
gg.report.time=30sec
gg.classpath=ggjava/lib/gridgain-goldengate-19/*
javawriter.bootoptions=-Xmx512m -Xms32m -Djava.class.path=.:./ggjava/ggjava.jar:./dirprm

Create a GridGain configuration file, dirprm/gridgain-config.xml. Example:

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="personOpHandler" name="personOpHandler" class="org.gridgain.oracle.goldengate.handler.PersonOperationHandler"/>

    <bean id="ignite.cfg" class="org.apache.ignite.configuration.IgniteConfiguration">
        <property name="localHost" value="127.0.0.1"/>

        <property name="cacheConfiguration">
            <list>
                <bean class="org.apache.ignite.configuration.CacheConfiguration">
                    <property name="name" value="person"/>
                    <property name="atomicityMode" value="ATOMIC"/>
                    <property name="backups" value="1"/>
                </bean>
                <bean class="org.apache.ignite.configuration.CacheConfiguration">
                    <property name="name" value="address"/>
                    <property name="atomicityMode" value="TRANSACTIONAL"/>
                    <property name="backups" value="1"/>
                </bean>
            </list>
        </property>
    </bean>
</beans>

Add the replicat process:
```
add replicat javarepl, exttrail dirdat/tr
```
The two-character trail name comes from the extract process configuration.
Start the replication process:
```
start replicat javarepl
```
Check the process status using the info javarepl (basic) or view report javarepl (verbose) command.
For process log, see dirrpt/JAVAREPL.LOG.

Errors and Remedies

Problem:

The `./ggsci: error while loading shared libraries: "libjvm.so: cannot open shared object file: No such file or directory".

Reason:

Some Java variables are not configured correctly.

Remedy:

Set the variables as follows:

export JAVA_HOME=<valid-jdk-8-path>
export PATH=$JAVA_HOME/bin:$PATH
export LD_LIBRARY_PATH=$JAVA_HOME/jre/lib/amd64/server:$LD_LIBRARY_PATH

Place the GoldenGate trail files into the dirdat directory.

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Last updated on Oct 09, 2024