diff --git a/analytic_engine/src/instance/mod.rs b/analytic_engine/src/instance/mod.rs
index 7e45bd37fd..844319d660 100644
--- a/analytic_engine/src/instance/mod.rs
+++ b/analytic_engine/src/instance/mod.rs
@@ -147,8 +147,6 @@ pub struct Instance {
     pub(crate) db_write_buffer_size: usize,
     /// Space write buffer size
     pub(crate) space_write_buffer_size: usize,
-    /// The ratio of table's write buffer size to trigger preflush
-    pub(crate) preflush_write_buffer_size_ratio: f32,
     /// Replay wal batch size
     pub(crate) replay_batch_size: usize,
     /// Write sst max buffer size
diff --git a/analytic_engine/src/instance/open.rs b/analytic_engine/src/instance/open.rs
index c7f5291861..be413ac665 100644
--- a/analytic_engine/src/instance/open.rs
+++ b/analytic_engine/src/instance/open.rs
@@ -10,7 +10,7 @@ use std::{
 use common_types::schema::IndexInWriterSchema;
 use log::{debug, error, info, trace};
 use object_store::ObjectStoreRef;
-use snafu::{OptionExt, ResultExt};
+use snafu::ResultExt;
 use table_engine::engine::OpenTableRequest;
 use wal::{
     log_batch::LogEntry,
@@ -23,9 +23,7 @@ use crate::{
     engine,
     instance::{
         self,
-        engine::{
-            ApplyMemTable, FlushTable, OpenManifest, ReadMetaUpdate, ReadWal, Result,
-        },
+        engine::{ApplyMemTable, FlushTable, OpenManifest, ReadMetaUpdate, ReadWal, Result},
         flush_compaction::TableFlushOptions,
         mem_collector::MemUsageCollector,
         serial_executor::TableOpSerialExecutor,
@@ -40,7 +38,7 @@ use crate::{
         factory::{FactoryRef as SstFactoryRef, ObjectStorePickerRef, ScanOptions},
         file::FilePurger,
     },
-    table::data::{TableDataRef},
+    table::data::TableDataRef,
     table_meta_set_impl::TableMetaSetImpl,
 };
 
@@ -124,7 +122,6 @@ impl Instance {
             mem_usage_collector: Arc::new(MemUsageCollector::default()),
             db_write_buffer_size: ctx.config.db_write_buffer_size,
             space_write_buffer_size: ctx.config.space_write_buffer_size,
-            preflush_write_buffer_size_ratio: ctx.config.preflush_write_buffer_size_ratio,
             replay_batch_size: ctx.config.replay_batch_size,
             write_sst_max_buffer_size: ctx.config.write_sst_max_buffer_size.as_byte() as usize,
             max_bytes_per_write_batch: ctx
diff --git a/analytic_engine/src/manifest/details.rs b/analytic_engine/src/manifest/details.rs
index 59feccfeff..3ede407ace 100644
--- a/analytic_engine/src/manifest/details.rs
+++ b/analytic_engine/src/manifest/details.rs
@@ -705,7 +705,8 @@ mod tests {
             meta_edit::{
                 AddTableMeta, AlterOptionsMeta, AlterSchemaMeta, DropTableMeta, MetaEdit,
                 MetaUpdate, VersionEditMeta,
-            }, LoadRequest, Manifest,
+            },
+            LoadRequest, Manifest,
         },
         table::data::TableShardInfo,
         TableOptions,
@@ -768,7 +769,7 @@ mod tests {
 
             match meta_edit {
                 MetaEdit::Update(update) => {
-                    builder.apply_update(update);
+                    builder.apply_update(update).unwrap();
                 }
                 MetaEdit::Snapshot(meta_snapshot) => {
                     let MetaSnapshot {
diff --git a/analytic_engine/src/manifest/mod.rs b/analytic_engine/src/manifest/mod.rs
index 78783d3bcd..15a645fb99 100644
--- a/analytic_engine/src/manifest/mod.rs
+++ b/analytic_engine/src/manifest/mod.rs
@@ -13,10 +13,7 @@ use common_types::table::ShardId;
 use common_util::error::GenericResult;
 use table_engine::table::TableId;
 
-use crate::{
-    manifest::{meta_edit::MetaEditRequest},
-    space::SpaceId,
-};
+use crate::{manifest::meta_edit::MetaEditRequest, space::SpaceId};
 
 #[derive(Debug)]
 pub struct LoadRequest {
diff --git a/analytic_engine/src/table_meta_set_impl.rs b/analytic_engine/src/table_meta_set_impl.rs
index b1bdba61e1..b680f56d3a 100644
--- a/analytic_engine/src/table_meta_set_impl.rs
+++ b/analytic_engine/src/table_meta_set_impl.rs
@@ -34,6 +34,7 @@ use crate::{
 pub(crate) struct TableMetaSetImpl {
     pub(crate) spaces: SpacesRef,
     pub(crate) file_purger: FilePurgerRef,
+    // TODO: maybe not suitable to place this parameter here?
     pub(crate) preflush_write_buffer_size_ratio: f32,
 }