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yiguolei pushed a commit to branch branch-4.2
in repository https://gitbox.apache.org/repos/asf/doris.git
The following commit(s) were added to refs/heads/branch-4.2 by this push:
new 7738bcbc5d6 [improvement](fe) Adjust scanner defaults for branch-4.2
(#68376)
7738bcbc5d6 is described below
commit 7738bcbc5d6888d54c489e9daf65a4719543051d
Author: HappenLee <[email protected]>
AuthorDate: Wed Sep 23 08:49:45 2026 +0800
[improvement](fe) Adjust scanner defaults for branch-4.2 (#68376)
### What problem does this PR solve?
Issue Number: None
Related PR: #68374, #63389, #65263
Problem Summary:
On branch-4.2, sessions currently default to `min_scanners_concurrency =
1` and `enable_expr_zonemap_filter = false`. Set these defaults to `4`
and `true`, respectively, and update the English and Chinese
session-variable descriptions.
This enables the existing expression ZoneMap filtering path by default
and raises the minimum scanner concurrency under the existing
scanner-count, concurrency and memory limits. Serial scans continue to
use one scanner. Both variables remain configurable through the existing
session/global settings and are already forwarded to BE.
### Release note
Enable expression ZoneMap filtering by default and increase the default
`min_scanners_concurrency` from `1` to `4`.
### Check List (For Author)
- Test: FE unit tests and Checkstyle passed.
- `MAVEN_ARGS='-T 48' bash run-fe-ut.sh --run
org.apache.doris.qe.SessionVariablesTest,org.apache.doris.qe.VariableMgrTest`:
29 tests, 0 failures/errors/skips.
- `mvn -T 48 checkstyle:check -pl fe-core` (from `fe/`): 0 violations.
- `git diff --check`: passed.
- Behavior changed: Yes. The two session defaults change as described
above.
- Does this need documentation: No. Both session-variable descriptions
are updated.
---
.../src/main/java/org/apache/doris/qe/SessionVariable.java | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java
b/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java
index 0c099760736..2c97642435b 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java
@@ -1156,9 +1156,9 @@ public class SessionVariable implements Serializable,
Writable {
public int localExchangeFreeBlocksLimit = 4;
@VariableMgr.VarAttr(name = MIN_SCANNERS_CONCURRENCY, needForward = true,
description = {
- "Scanner 的最小并发度，默认为 1", "The min concurrency of Scanner, default 1"
+ "Scanner 的最小并发度，默认为 4", "The min concurrency of Scanner, default 4"
})
- public int minScannersConcurrency = 1;
+ public int minScannersConcurrency = 4;
@VariableMgr.VarAttr(name = MIN_FILE_SCANNERS_CONCURRENCY, needForward =
true, description = {
"外表 Scanner 的最小并发度，默认为 1", "The min concurrency of Remote Scanner,
default 1"
@@ -2779,12 +2779,12 @@ public class SessionVariable implements Serializable,
Writable {
name = ENABLE_EXPR_ZONEMAP_FILTER,
fuzzy = true,
description = {"控制支持该变量的 scanner 是否启用表达式 ZoneMap 过滤。"
- + "File Scanner V2 始终启用安全的表达式 ZoneMap 过滤。默认为 false。",
+ + "File Scanner V2 始终启用安全的表达式 ZoneMap 过滤。默认为 true。",
"Controls expression ZoneMap filtering in scanners that
honor this variable. "
+ "File Scanner V2 always enables safe expression
ZoneMap filtering. "
- + "The default value is false."},
+ + "The default value is true."},
needForward = true)
- public boolean enableExprZonemapFilter = false;
+ public boolean enableExprZonemapFilter = true;
@VariableMgr.VarAttr(
name = CHECK_ORC_INIT_SARGS_SUCCESS,
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