sandynz commented on PR #19949:
URL: https://github.com/apache/shardingsphere/pull/19949#issuecomment-1209242405
I pulled the code of this PR and ran TextPrimaryKeyScalingIT, it's
reproduced:
```
[Thread-18] o.a.s.d.p.s.r.RuleAlteredJob - job prepare failed,
0130317c30317c3054317c7368617264696e675f6462-1
org.apache.shardingsphere.infra.util.spi.exception.ServiceProviderNotFoundException:
SPI-00001: No implementation class load from SPI
`org.apache.shardingsphere.scaling.core.job.importer.ImporterCreator` with type
`MySQL`.
at
org.apache.shardingsphere.infra.util.spi.type.typed.TypedSPIRegistry.getRegisteredService(TypedSPIRegistry.java:100)
at
org.apache.shardingsphere.scaling.core.job.importer.ImporterCreatorFactory.getInstance(ImporterCreatorFactory.java:41)
at
org.apache.shardingsphere.data.pipeline.core.task.IncrementalTask.createImporters(IncrementalTask.java:100)
at
org.apache.shardingsphere.data.pipeline.core.task.IncrementalTask.<init>(IncrementalTask.java:79)
at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.RuleAlteredJobPreparer.initIncrementalTasks(RuleAlteredJobPreparer.java:200)
at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.RuleAlteredJobPreparer.prepare(RuleAlteredJobPreparer.java:92)
at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.RuleAlteredJob.prepare(RuleAlteredJob.java:101)
at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.RuleAlteredJob.lambda$execute$0(RuleAlteredJob.java:71)
at java.lang.Thread.run(Thread.java:748)
```
This is the root cause. You could follow this one.
job item progress:
```
sourceDatabaseType: MySQL
status: PREPARING_FAILURE
```
It caused another issue in ShowScalingJobStatusQueryResultSet. I'll fix this
one.
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