Supply the max_schema/data_region_group_num param to modify schema when create or alter database by zerolbsony · Pull Request #17988 · apache/iotdb

zerolbsony · 2026-06-18T08:55:07Z

Adjust the maximum quotas for database schemas based on the MAX_DATA_REGION_GROUP_NUM and MAX_SCHEMA_REGION_GROUP_NUM parameters:
ALTER DATABASE root.sg WITH MAX_DATA_REGION_GROUP_NUM = 4, MAX_SCHEMA_REGION_GROUP_NUM = 3;

…en create or alter database

…al connection when the connection is closed

CRZbulabula

A few non-blocking cleanups. One of them (the orphaned min-based ALTER validation) is on pre-existing lines that aren't part of this diff, so I'm noting it here rather than inline:

Orphaned min-based ALTER validation — ClusterSchemaManager.java:242 and :256 (alterDatabase): the isSetMinSchemaRegionGroupNum() / isSetMinDataRegionGroupNum() validation blocks (the "could only be increased" checks) are now unreachable from the SQL path, because after this PR no SQL statement ever sets minSchemaRegionGroupNum/minDataRegionGroupNum — the keyword now sets max* instead. These branches are now only hit by internal/Thrift callers that still populate the min fields. This isn't wrong, but it's easy to mistake for the active validation. Consider adding a comment clarifying it only applies to non-SQL callers, or confirm nothing else still sends min* via ALTER.

The inline comments below cover the remaining items.

CRZbulabula · 2026-06-21T09:03:18Z

+  }
+
+  private static TSStatus validateMaxRegionGroupNum(
+      final String database,


Unused parameter. The database parameter of validateMaxRegionGroupNum is never referenced in the method body (it reads policy/default/field-name purely from consensusGroupType and CONF). Likewise validateMaxRegionGroupNumOnCreation only forwards databaseSchema.getName() into it. Either drop the parameter, or use it in the error message for clearer diagnostics.

CRZbulabula · 2026-06-21T09:03:18Z

+                ? databaseSchema.getMaxSchemaRegionGroupNum()
+                : databaseSchema.getMaxDataRegionGroupNum(),
+            true);
+    return status.getCode() == TSStatusCode.SUCCESS_STATUS.getStatusCode() ? previousError : status;


Error-aggregation pattern is replace, not accumulate. validateMaxRegionGroupNumOnCreation returns previousError on success and status on failure, and the two call sites chain it as errorResp = validateMaxRegionGroupNumOnCreation(schema, SchemaRegion, errorResp) then again for DataRegion. If the SchemaRegion validation already produced a non-null error and the DataRegion validation also fails, the SchemaRegion error is silently overwritten (DataRegion wins). With current inputs only one error can occur so it's harmless today, but the pattern reads as if it accumulates when it actually replaces. The alter path already does the clearer if (status != OK) return status; per dimension — applying the same shape here on create would avoid the subtlety.

CRZbulabula · 2026-06-21T09:03:18Z

          }
        }
        connectionToUse = null;
+        statement = null;


Unrelated drive-by change. This statement = null; (and the PR's head commit "The old statement shall be reclaimed in the same manner as the original connection") is a statement/connection-lifecycle fix that is unrelated to the MAX_*_REGION_GROUP_NUM feature this PR is about. It looks like a legitimate resource-cleanup fix, but please either split it into its own PR or call it out in the PR description so reviewers and git blame aren't confused about why it's here.

CRZbulabula

PTAL.

CRZbulabula · 2026-06-21T09:03:25Z

+              "select database, max_schema_region_group_num, max_data_region_group_num "
+                  + "from information_schema.databases where database = 'test_create'"),
+          "database,max_schema_region_group_num,max_data_region_group_num,",
+          Collections.singleton("test_create,3,4,"));


To verify the demand number is set correctly, u should not only test the metadata (the number obtained via information_schema or show databases), but also write some data and check if the region groups are created successfully.

Not sure if we have these CIs currently, you should check and append when necessary.

CRZbulabula · 2026-06-21T09:05:55Z

@@ -267,6 +268,27 @@ public TSStatus alterDatabase(
      }
    }


Both min region group num params are deprecated, you can delete them.

CRZbulabula · 2026-06-21T09:09:59Z

-      } catch (final DatabaseNotExistsException e) {
-        // ignore the pre deleted database
-        continue;
+      int maxSchemaRegionGroupNum = databaseSchema.getMaxSchemaRegionGroupNum();


Current implementation of this for-loop can be further optimized:

the adjustment logic for both schema and data region groups share lots of codes, can be extracted to some common functions.

the calcMaxRegionGroupNum can be invoked at most twice.

CRZbulabula · 2026-06-21T09:10:54Z

@@ -267,6 +267,20 @@ public TSStatus alterDatabase(final DatabaseSchemaPlan plan) {
            currentSchema.getName(),
            currentSchema.getMaxDataRegionGroupNum());


Similar as above, these are useless codes now. You can delete them.

Copilot

Pull request overview

This PR updates database create/alter semantics to support explicitly setting maximum region-group quotas via new MAX_SCHEMA_REGION_GROUP_NUM and MAX_DATA_REGION_GROUP_NUM properties, and wires the values through parsing, planning, ConfigNode validation/persistence, and integration tests.

Changes:

Replace the deprecated *_REGION_GROUP_NUM SQL attributes with MAX_*_REGION_GROUP_NUM in the ANTLR grammar and parser/statement plumbing.
Add ConfigNode-side validation and persistence for altering max region-group quotas, including policy gating (CUSTOM vs AUTO).
Update and add integration tests to cover creation, alteration, mixed policy behavior, and deprecated-syntax rejection.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
iotdb-core/metrics/interface/src/main/java/org/apache/iotdb/metrics/reporter/iotdb/IoTDBSessionReporter.java	Stops creating the internal metrics DB with deprecated region-group properties.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/statement/metadata/DatabaseSchemaStatement.java	Renames statement fields to `max*RegionGroupNum` and updates string output to include them.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/parser/ASTVisitor.java	Parses new `MAX_*_REGION_GROUP_NUM` attributes into the statement object.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/execution/config/TableConfigTaskVisitor.java	Maps relational DB properties to `max*RegionGroupNum` in `TDatabaseSchema`.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/execution/config/metadata/relational/AbstractDatabaseTask.java	Renames supported property keys to `max_schema_region_group_num` / `max_data_region_group_num`.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/execution/config/metadata/DatabaseSchemaTask.java	Propagates max region-group values into `TDatabaseSchema` for tree-model create/alter.
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/persistence/schema/ClusterSchemaInfo.java	Persists altered max region-group values into stored database schemas.
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/manager/schema/ClusterSchemaManager.java	Adds validation for setting max region-group quotas and adjusts auto-tuning behavior when policies are CUSTOM.
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/manager/partition/PartitionManager.java	Uses `maxRegionGroupNum` as the target when extending region groups under CUSTOM policy.
iotdb-core/antlr/src/main/antlr4/org/apache/iotdb/db/qp/sql/SqlLexer.g4	Introduces lexer tokens for `MAX_SCHEMA_REGION_GROUP_NUM` / `MAX_DATA_REGION_GROUP_NUM`.
iotdb-core/antlr/src/main/antlr4/org/apache/iotdb/db/qp/sql/IoTDBSqlParser.g4	Updates database attribute grammar to accept only the new MAX keys.
iotdb-core/antlr/src/main/antlr4/org/apache/iotdb/db/qp/sql/IdentifierParser.g4	Adds MAX region-group keys to the reserved keywords list.
integration-test/src/test/java/org/apache/iotdb/relational/it/schema/IoTDBDatabaseMixedRegionGroupPolicyIT.java	New IT verifying AUTO policy still auto-adjusts when the other policy is CUSTOM.
integration-test/src/test/java/org/apache/iotdb/relational/it/schema/IoTDBDatabaseMaxRegionGroupNumIT.java	New IT covering create/alter with MAX keys and rejecting deprecated keys.
integration-test/src/test/java/org/apache/iotdb/relational/it/schema/IoTDBDatabaseIT.java	Updates existing ITs and adds coverage for rejecting max keys under AUTO policy.
integration-test/src/test/java/org/apache/iotdb/pipe/it/dual/treemodel/auto/enhanced/IoTDBPipeIdempotentIT.java	Updates pipe IT setup/payloads to use MAX keys and CUSTOM policies.
integration-test/src/test/java/org/apache/iotdb/pipe/it/dual/tablemodel/manual/enhanced/IoTDBPipeMetaIT.java	Removes use of deprecated alter-database properties in test SQL.
integration-test/src/test/java/org/apache/iotdb/db/it/utils/TestUtils.java	Resets statement state on retry after SQL failures.
integration-test/src/test/java/org/apache/iotdb/confignode/it/database/IoTDBDatabaseRegionControlIT.java	Updates SQL to use MAX keys and adds a test ensuring deprecated SQL is rejected.

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+    final boolean isSchemaRegion = TConsensusGroupType.SchemaRegion.equals(consensusGroupType);
+    final String fieldName = isSchemaRegion ? "MaxSchemaRegionGroupNum" : "MaxDataRegionGroupNum";
+
+    final int allocatedRegionGroupCount;
+    try {
+      allocatedRegionGroupCount =
+          getPartitionManager().getRegionGroupCount(database, consensusGroupType);
+    } catch (final DatabaseNotExistsException e) {
+      return new TSStatus(TSStatusCode.DATABASE_NOT_EXIST.getStatusCode())
+          .setMessage(e.getMessage());
+    }
+    if (maxRegionGroupNum < allocatedRegionGroupCount) {
+      return new TSStatus(TSStatusCode.DATABASE_CONFIG_ERROR.getStatusCode())
+          .setMessage(
+              String.format(
+                  "%s should be greater than or equal to allocated %sRegionGroupNum: %d.",
+                  fieldName, isSchemaRegion ? "Schema" : "Data", allocatedRegionGroupCount));
+    }

    return StatusUtils.OK;


        + dataReplicationFactor
        + ", timePartitionInterval="
        + timePartitionInterval
-        + ", schemaRegionGroupNum="
-        + schemaRegionGroupNum
-        + ", dataRegionGroupNum="
-        + dataRegionGroupNum
+        + ", maxSchemaRegionGroupNum="
+        + maxSchemaRegionGroupNum
+        + ", maxDataRegionGroupNum="
+        + maxDataRegionGroupNum


        connectionToUse = null;
+        statement = null;


…group_quota # Conflicts: # iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/manager/schema/ClusterSchemaManager.java

…ach the maximum quota after increasing the corresponding quota limit

zerolbsony added 2 commits June 18, 2026 16:51

Supply the max_schema/data_region_group_num param to modify schema wh…

867a151

…en create or alter database

Fix unexpected SQL execution on the IT

e3cd74a

zerolbsony force-pushed the alter_max_region_group_quota branch from a70914c to e3cd74a Compare June 18, 2026 09:59

The old statement shall be reclaimed in the same manner as the origin…

515c137

…al connection when the connection is closed

CRZbulabula reviewed Jun 21, 2026

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CRZbulabula requested changes Jun 21, 2026

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CRZbulabula requested a review from Copilot June 21, 2026 09:12

Copilot started reviewing on behalf of CRZbulabula June 21, 2026 09:13 View session

Copilot AI reviewed Jun 21, 2026

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zerolbsony added 5 commits June 22, 2026 12:31

Fix problems based on review suggestion

23d514c

Merge remote-tracking branch 'upstream/master' into alter_max_region_…

da71188

…group_quota # Conflicts: # iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/manager/schema/ClusterSchemaManager.java

Fix conflict

8a2fd61

Check whether the allocated schema or data region group count will re…

30e5923

…ach the maximum quota after increasing the corresponding quota limit

Adjust to dynamic compute the expect value

e780a74

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Supply the max_schema/data_region_group_num param to modify schema when create or alter database#17988

Supply the max_schema/data_region_group_num param to modify schema when create or alter database#17988
zerolbsony wants to merge 8 commits into
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		@@ -267,6 +267,20 @@ public TSStatus alterDatabase(final DatabaseSchemaPlan plan) {
		currentSchema.getName(),
		currentSchema.getMaxDataRegionGroupNum());

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