fix: raise l0 compaction memory ratio to 0.5 (#36690)

5 percent of free memory is too less for l0 compaction. This pr will
raise it to 50 percent.

See also: #36614

Signed-off-by: yangxuan <xuan.yang@zilliz.com>

configs/milvus.yaml

@@ -652,7 +652,7 @@ dataNode:
     readBufferSizeInMB: 16 # The data block size (in MB) read from chunk manager by the datanode during import.
     maxTaskSlotNum: 16 # The maximum number of slots occupied by each import/pre-import task.
   compaction:
-    levelZeroBatchMemoryRatio: 0.05 # The minimal memory ratio of free memory for level zero compaction executing in batch mode
+    levelZeroBatchMemoryRatio: 0.5 # The minimal memory ratio of free memory for level zero compaction executing in batch mode
     levelZeroMaxBatchSize: -1 # Max batch size refers to the max number of L1/L2 segments in a batch when executing L0 compaction. Default to -1, any value that is less than 1 means no limit. Valid range: >= 1.
   gracefulStopTimeout: 1800 # seconds. force stop node without graceful stop
   slot:

pkg/util/paramtable/component_param.go

@@ -4494,7 +4494,7 @@ if this parameter <= 0, will set it as 10`,
 		Key:          "dataNode.compaction.levelZeroBatchMemoryRatio",
 		Version:      "2.4.0",
 		Doc:          "The minimal memory ratio of free memory for level zero compaction executing in batch mode",
-		DefaultValue: "0.05",
+		DefaultValue: "0.5",
 		Export:       true,
 	}
 	p.L0BatchMemoryRatio.Init(base.mgr)