modify default value for sync max parallel to mitigate oom on dn(#26763) (#26231)

Signed-off-by: NMrPresent-Han <chun.han@zilliz.com>

configs/milvus.yaml

@@ -371,7 +371,7 @@ dataNode:
     flowGraph:
       maxQueueLength: 16 # Maximum length of task queue in flowgraph
       maxParallelism: 1024 # Maximum number of tasks executed in parallel in the flowgraph
-    maxParallelSyncTaskNum: 2 # Maximum number of sync tasks executed in parallel in each flush manager
+    maxParallelSyncTaskNum: 6 # Maximum number of sync tasks executed in parallel in each flush manager
   segment:
     insertBufSize: 16777216 # Max buffer size to flush for a single segment.
     deleteBufBytes: 67108864 # Max buffer size to flush del for a single channel

pkg/util/paramtable/component_param.go

@@ -2398,7 +2398,7 @@ func (p *dataNodeConfig) init(base *BaseTable) {
 	p.MaxParallelSyncTaskNum = ParamItem{
 		Key:          "dataNode.dataSync.maxParallelSyncTaskNum",
 		Version:      "2.3.0",
-		DefaultValue: "2",
+		DefaultValue: "6",
 		Doc:          "Maximum number of sync tasks executed in parallel in each flush manager",
 		Export:       true,
 	}