[fix][cdc] fix uid conflicts during multi-database synchronization.

[vinlee19]

Proposed changes

When dealing with multiple databases in MySQL, it's common to have tables with identical schemas spread across different databases. If you try to synchronize these databases to Doris using the provided shell script,

bin/flink run \
    -Dexecution.checkpointing.interval=10s \
    -Dparallelism.default=1 \
    -c org.apache.doris.flink.tools.cdc.CdcTools \
    lib/flink-doris-connector-1.17-1.6.0.jar \
    mysql-sync-database  \
    --mysql-conf hostname=127.0.0.1 \
    --mysql-conf port=3306 \
    --mysql-conf username=root \
    --mysql-conf password=123456 \
    --mysql-conf database-name="multi.*" \
    --sink-conf fenodes=127.0.0.1:8030 \
    --sink-conf username=root \
    --sink-conf password=123456 \
    --sink-conf jdbc-url=jdbc:mysql://127.0.0.1:9030 \
    --sink-conf sink.label-prefix=label \
    --table-conf replication_num=1 

you might encounter the following error:

rg.apache.flink.client.program.ProgramInvocationException: The main method caused an error: Hash collision on user-specified ID "customer_1". Most likely cause is a non-unique ID. Please check that all IDs specified via `uid(String)` are unique.
        at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:372)
        at org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:222)
        at org.apache.flink.client.ClientUtils.executeProgram(ClientUtils.java:105)
        at org.apache.flink.client.cli.CliFrontend.executeProgram(CliFrontend.java:851)
        at org.apache.flink.client.cli.CliFrontend.run(CliFrontend.java:245)
        at org.apache.flink.client.cli.CliFrontend.parseAndRun(CliFrontend.java:1095)
        at org.apache.flink.client.cli.CliFrontend.lambda$mainInternal$9(CliFrontend.java:1189)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1899)
        at org.apache.flink.runtime.security.contexts.HadoopSecurityContext.runSecured(HadoopSecurityContext.java:41)
        at org.apache.flink.client.cli.CliFrontend.mainInternal(CliFrontend.java:1189)
        at org.apache.flink.client.cli.CliFrontend.main(CliFrontend.java:1157)
Caused by: java.lang.IllegalArgumentException: Hash collision on user-specified ID "customer_1". Most likely cause is a non-unique ID. Please check that all IDs specified via `uid(String)` are unique.
        at org.apache.flink.streaming.api.graph.StreamGraphHasherV2.generateNodeHash(StreamGraphHasherV2.java:185)
        at org.apache.flink.streaming.api.graph.StreamGraphHasherV2.traverseStreamGraphAndGenerateHashes(StreamGraphHasherV2.java:110)
        at org.apache.flink.streaming.api.graph.StreamingJobGraphGenerator.createJobGraph(StreamingJobGraphGenerator.java:246)
        at org.apache.flink.streaming.api.graph.StreamingJobGraphGenerator.createJobGraph(StreamingJobGraphGenerator.java:160)
        at org.apache.flink.streaming.api.graph.StreamGraph.getJobGraph(StreamGraph.java:1024)
        at org.apache.flink.client.StreamGraphTranslator.translateToJobGraph(StreamGraphTranslator.java:56)
        at org.apache.flink.client.FlinkPipelineTranslationUtil.getJobGraph(FlinkPipelineTranslationUtil.java:43)
        at org.apache.flink.client.deployment.executors.PipelineExecutorUtils.getJobGraph(PipelineExecutorUtils.java:61)
        at org.apache.flink.client.deployment.executors.AbstractSessionClusterExecutor.execute(AbstractSessionClusterExecutor.java:72)
        at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.executeAsync(StreamExecutionEnvironment.java:2197)
        at org.apache.flink.client.program.StreamContextEnvironment.executeAsync(StreamContextEnvironment.java:189)
        at org.apache.flink.client.program.StreamContextEnvironment.execute(StreamContextEnvironment.java:118)
        at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:2058)
        at org.apache.doris.flink.tools.cdc.CdcTools.syncDatabase(CdcTools.java:151)
        at org.apache.doris.flink.tools.cdc.CdcTools.createMySQLSyncDatabase(CdcTools.java:74)
        at org.apache.doris.flink.tools.cdc.CdcTools.main(CdcTools.java:51)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:355)

This PR aims to address this issue.

Issue Number: close #xxx

Problem Summary:

Describe the overview of changes.

Checklist(Required)

1. Does it affect the original behavior: (Yes/No/I Don't know)
2. Has unit tests been added: (Yes/No/No Need)
3. Has document been added or modified: (Yes/No/No Need)
4. Does it need to update dependencies: (Yes/No)
5. Are there any changes that cannot be rolled back: (Yes/No)

Further comments

If this is a relatively large or complex change, kick off the discussion at [email protected] by explaining why you chose the solution you did and what alternatives you considered, etc...

[JNSimba]

This may will result in the inability to recover from previous checkpoints.

[vinlee19]

This may will result in the inability to recover from previous checkpoints. Thanks, I've already solved it