terrymanu edited a comment on issue #11307:
URL:
https://github.com/apache/shardingsphere/issues/11307#issuecomment-897803147
The problem is for thread safe in class OrderedSPIRegistry.
When I add some log in the method:
```java
/**
* Get registered services.
*
* @param types types
* @param orderedSPIClass class of ordered SPI
* @param <K> type of key
* @param <V> type of ordered SPI class
* @param comparator comparator
* @return registered services
*/
@SuppressWarnings("unchecked")
public static <K, V extends OrderedSPI<?>> Map<K, V>
getRegisteredServices(final Collection<K> types, final Class<V>
orderedSPIClass, final Comparator<Integer> comparator) {
Optional<CachedOrderedServices> cachedServices =
OrderedServicesCache.findCachedServices(types, orderedSPIClass);
if (cachedServices.isPresent()) {
Map<K, V> result = (Map<K, V>)
cachedServices.get().getServices();
if (types.size() == 2 && !result.isEmpty() &&
result.keySet().iterator().next().getClass().equals(SingleTableRuleBuilder.class))
{
// Add log
System.out.println("from cache: types:" + types + "result: "
+ result);
}
return result;
}
Collection<V> registeredServices =
getRegisteredServices(orderedSPIClass, comparator);
Map<K, V> result = new LinkedHashMap<>(registeredServices.size(), 1);
for (V each : registeredServices) {
types.stream().filter(type -> each.getTypeClass() ==
type.getClass()).forEach(type -> result.put(type, each));
}
OrderedServicesCache.cacheServices(types, orderedSPIClass, result);
return result;
}
```
The result form cache are error sometimes.
The error log:
```
from cache:
types:
[org.apache.shardingsphere.infra.persist.rule.builder.DistMetaDataPersistRuleBuilder@21cf7d6c,
org.apache.shardingsphere.authority.rule.builder.AuthorityRuleBuilder@14e57238]
result:
{org.apache.shardingsphere.infra.rule.builder.single.SingleTableRuleBuilder@6015bb85=org.apache.shardingsphere.infra.rule.builder.single.DefaultSingleTableRuleConfigurationBuilder@602e976a}
```
When using `DistMetaDataPersistRuleBuilder` and `AuthorityRuleBuilder` to
get the builder, but return `SingleTableRuleBuilder`
And then throw exception below:
```
java.lang.ClassCastException:
org.apache.shardingsphere.infra.rule.builder.single.SingleTableRuleBuilder
cannot be cast to
org.apache.shardingsphere.infra.rule.builder.scope.GlobalRuleBuilder
at
org.apache.shardingsphere.infra.rule.builder.ShardingSphereRulesBuilder.buildGlobalRules(ShardingSphereRulesBuilder.java:129)
at
org.apache.shardingsphere.infra.context.metadata.MetaDataContextsBuilder.buildGlobalSchemaMetaData(MetaDataContextsBuilder.java:119)
at
org.apache.shardingsphere.infra.context.metadata.MetaDataContextsBuilder.build(MetaDataContextsBuilder.java:108)
at
org.apache.shardingsphere.driver.jdbc.core.datasource.ShardingSphereDataSource.<init>(ShardingSphereDataSource.java:66)
at
org.apache.shardingsphere.driver.jdbc.core.datasource.ShardingSphereDataSource.<init>(ShardingSphereDataSource.java:58)
at
org.apache.shardingsphere.driver.api.ShardingSphereDataSourceFactory.createDataSource(ShardingSphereDataSourceFactory.java:52)
at
org.apache.shardingsphere.driver.api.yaml.YamlShardingSphereDataSourceFactory.createDataSource(YamlShardingSphereDataSourceFactory.java:132)
at
org.apache.shardingsphere.driver.api.yaml.YamlShardingSphereDataSourceFactory.createDataSource(YamlShardingSphereDataSourceFactory.java:83)
at
org.apache.shardingsphere.test.integration.junit.container.adapter.impl.ShardingSphereJDBCContainer.getDataSource(ShardingSphereJDBCContainer.java:77)
at
org.apache.shardingsphere.test.integration.junit.compose.ContainerCompose.getDataSourceMap(ContainerCompose.java:162)
at
org.apache.shardingsphere.test.integration.engine.it.BaseITCase.createDataSource(BaseITCase.java:83)
at sun.reflect.GeneratedMethodAccessor34.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
at
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:27)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at
com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:125)
at
com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:69)
at
com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:78)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
```
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