tristaZero commented on a change in pull request #3988: Using multithreading
make loadDefaultTables faster and remove repeat load tableMetaData
URL:
https://github.com/apache/incubator-shardingsphere/pull/3988#discussion_r366844620
##########
File path:
sharding-core/sharding-core-execute/src/main/java/org/apache/shardingsphere/sharding/execute/metadata/loader/ShardingTableMetaDataLoader.java
##########
@@ -206,19 +207,46 @@ public TableMetas loadAll(final ShardingRule
shardingRule) throws SQLException {
return result;
}
- private Map<String, TableMetaData> loadDefaultTables(final ShardingRule
shardingRule) throws SQLException {
+ private Map<String, TableMetaData> loadDefaultTables(final ShardingRule
shardingRule, final Map<String, TableMetaData> result) throws SQLException {
Optional<String> actualDefaultDataSourceName =
shardingRule.findActualDefaultDataSourceName();
if (!actualDefaultDataSourceName.isPresent()) {
return Collections.emptyMap();
}
Collection<String> tableNames =
loadAllTableNames(actualDefaultDataSourceName.get());
- Map<String, TableMetaData> result = new HashMap<>(tableNames.size(),
1);
- for (String each : tableNames) {
- result.put(each, load(each, shardingRule));
+ removeRepeatTable(tableNames, result);
Review comment:
If there are two tables with the same name `t1` and different structures in
ds0 and default ds seperately, do you think removeRepeatTable() could return
correct result list?
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