yiguolei commented on code in PR #39927:
URL: https://github.com/apache/doris/pull/39927#discussion_r1732317607
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fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java:
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@@ -1246,13 +1251,11 @@ public void setMaxJoinNumberOfReorder(int
maxJoinNumberOfReorder) {
@VariableMgr.VarAttr(name = NTH_OPTIMIZED_PLAN)
private int nthOptimizedPlan = 1;
- @VariableMgr.VarAttr(name = LIMIT_ROWS_FOR_SINGLE_INSTANCE,
- description = {"当一个 ScanNode 上没有过滤条件，且 limit 值小于这个阈值时，"
- + "系统会将这个算子的并发度调整为1，以减少简单查询的扇出",
- "When a ScanNode has no filter conditions and the limit
value is less than this threshold, "
- + "the system will adjust the concurrency of this
operator to 1 "
- + "to reduce the fan-out of simple queries"})
- public long limitRowsForSingleInstance = 10000;
+ @VariableMgr.VarAttr(name = LIMIT_ROWS_FOR_SINGLE_INSTANCE, setter =
"setLimitRowsForSingleInstance",
+ description = {
+ "请使用 adaptive_pipeline_task_serial_read_on_limit",
+ "Please use adaptive_pipeline_task_serial_read_on_limit"})
+ public long limitRowsForSingleInstance = 8192;
Review Comment:
保持原来的值，10000就行了，万一有一些极限情况，上线后，直接性能下降了
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