strongduanmu edited a comment on issue #10108:
URL:
https://github.com/apache/shardingsphere/issues/10108#issuecomment-823001092
> Hi @strongduanmu could you look at this one? My impression that `INDEX`
metadata loading was in your charge?
Hi @ljwps, thank you very much for your feedback.
The physical table `FAQ_LOG_20210416` corresponding to the logical table
`FAQ_LOG` needs to be created in advance, because some metadata of the sharding
table needs to be loaded when starting.
For details, please refer to the ShardingMetaDataLoader class.
```java
public TableMetaData load(final String logicTableName, final DatabaseType
databaseType) throws SQLException {
TableRule tableRule = shardingRule.getTableRule(logicTableName);
if (!isCheckingMetaData) {
DataNode dataNode = tableRule.getActualDataNodes().iterator().next();
return
TableMetaDataLoader.load(dataSourceMap.get(shardingRule.getShardingDataSourceNames().getRawMasterDataSourceName(
dataNode.getDataSourceName())), dataNode.getTableName(),
databaseType.getName());
}
Map<String, List<DataNode>> dataNodeGroups =
tableRule.getDataNodeGroups();
Map<String, TableMetaData> actualTableMetaDataMap = new
HashMap<>(dataNodeGroups.size(), 1);
Map<String, Future<TableMetaData>> tableFutureMap = new
HashMap<>(dataNodeGroups.size(), 1);
ExecutorService executorService =
Executors.newFixedThreadPool(Math.min(CORES * 2, dataNodeGroups.size()));
for (Entry<String, List<DataNode>> entry : dataNodeGroups.entrySet()) {
for (DataNode each : entry.getValue()) {
Future<TableMetaData> futures = executorService.submit(() ->
load(each, databaseType));
tableFutureMap.put(each.getTableName(), futures);
}
}
...
}
```
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