diff --git a/interactive_engine/groot-module/src/main/java/com/alibaba/graphscope/groot/frontend/write/GraphWriter.java b/interactive_engine/groot-module/src/main/java/com/alibaba/graphscope/groot/frontend/write/GraphWriter.java
index 267c6e3e49fd..909769ac7f07 100644
--- a/interactive_engine/groot-module/src/main/java/com/alibaba/graphscope/groot/frontend/write/GraphWriter.java
+++ b/interactive_engine/groot-module/src/main/java/com/alibaba/graphscope/groot/frontend/write/GraphWriter.java
@@ -196,7 +196,6 @@ public void onFailure(Exception e) {
     }
 
     public List<Long> replayWALFrom(long offset, long timestamp) throws IOException {
-        List<Long> allIds = new ArrayList<>();
         return kafkaAppender.replayDMLRecordsFrom(offset, timestamp);
     }
 
diff --git a/interactive_engine/groot-module/src/main/java/com/alibaba/graphscope/groot/frontend/write/KafkaAppender.java b/interactive_engine/groot-module/src/main/java/com/alibaba/graphscope/groot/frontend/write/KafkaAppender.java
index 28499a7390c9..beb9391f3146 100644
--- a/interactive_engine/groot-module/src/main/java/com/alibaba/graphscope/groot/frontend/write/KafkaAppender.java
+++ b/interactive_engine/groot-module/src/main/java/com/alibaba/graphscope/groot/frontend/write/KafkaAppender.java
@@ -143,10 +143,7 @@ private long processTask(LogWriter logWriter, IngestTask task) throws IOExceptio
         if (batchSnapshotId == -1L) {
             throw new IllegalStateException("invalid ingestSnapshotId [" + batchSnapshotId + "]");
         }
-        logger.debug(
-                "append batch to WAL. requestId [{}], snapshotId [{}]",
-                task.requestId,
-                batchSnapshotId);
+        logger.debug("append batch to WAL. snapshotId [{}]", batchSnapshotId);
         long latestSnapshotId = task.operationBatch.getLatestSnapshotId();
         if (latestSnapshotId > 0 && latestSnapshotId < batchSnapshotId) {
             throw new IllegalStateException(
@@ -163,7 +160,7 @@ private long processTask(LogWriter logWriter, IngestTask task) throws IOExceptio
                     int storeId = entry.getKey();
                     OperationBatch batch = entry.getValue().build();
                     // logger.info("Log writer append partitionId [{}]", storeId);
-                    logWriter.append(storeId, new LogEntry(batchSnapshotId, batch));
+                    logWriter.append(storeId, new LogEntry(ingestSnapshotId.get(), batch));
                 }
             } catch (Exception e) {
                 // write failed, just throw out to fail this task
@@ -249,8 +246,7 @@ public List<Long> replayDMLRecordsFrom(long offset, long timestamp) throws IOExc
                         if (batch.getOperationCount() == 0) {
                             continue;
                         }
-                        batchSnapshotId = this.ingestSnapshotId.get();
-                        logWriter.appendAsync(storeId, new LogEntry(batchSnapshotId, batch));
+                        logWriter.append(storeId, new LogEntry(ingestSnapshotId.get(), batch));
                         replayCount++;
                     }
                 }
diff --git a/interactive_engine/groot-module/src/main/java/com/alibaba/graphscope/groot/store/SnapshotSortQueue.java b/interactive_engine/groot-module/src/main/java/com/alibaba/graphscope/groot/store/SnapshotSortQueue.java
index 408316a39784..bb3a48961f38 100644
--- a/interactive_engine/groot-module/src/main/java/com/alibaba/graphscope/groot/store/SnapshotSortQueue.java
+++ b/interactive_engine/groot-module/src/main/java/com/alibaba/graphscope/groot/store/SnapshotSortQueue.java
@@ -120,11 +120,11 @@ public StoreDataBatch poll() throws InterruptedException {
                 }
             } else {
                 logger.warn(
-                        "Illegal entry polled from queue [{}]. entrySnapshotId [{}] <"
-                                + " currentSnapshotId [{}]. Ignored entry",
-                        currentPollQueueIdx,
+                        "Illegal entry polled from queue, entrySnapshotId [{}] <"
+                                + " currentSnapshotId [{}]. Ignored entry {}",
                         snapshotId,
-                        currentPollSnapshotId);
+                        currentPollSnapshotId,
+                        entry.toProto());
             }
         }
     }
diff --git a/interactive_engine/groot-module/src/main/java/com/alibaba/graphscope/groot/store/WriterAgent.java b/interactive_engine/groot-module/src/main/java/com/alibaba/graphscope/groot/store/WriterAgent.java
index 2454021ba908..b869914961bc 100644
--- a/interactive_engine/groot-module/src/main/java/com/alibaba/graphscope/groot/store/WriterAgent.java
+++ b/interactive_engine/groot-module/src/main/java/com/alibaba/graphscope/groot/store/WriterAgent.java
@@ -56,8 +56,8 @@ public class WriterAgent implements MetricsAgent {
 
     private volatile boolean shouldStop = true;
     private SnapshotSortQueue bufferQueue;
-    private volatile long lastCommitSnapshotId;
-    private volatile long consumeSnapshotId;
+    private volatile long lastCommitSI;
+    private volatile long consumeSI;
     private volatile long consumeDdlSnapshotId;
     private final AtomicReference<SnapshotInfo> availSnapshotInfoRef;
     private ExecutorService commitExecutor;
@@ -97,8 +97,8 @@ public void init(long availSnapshotId) {
     }
 
     public void start() {
-        this.lastCommitSnapshotId = -1L;
-        this.consumeSnapshotId = 0L;
+        this.lastCommitSI = -1L;
+        this.consumeSI = 0L;
         this.consumeDdlSnapshotId = 0L;
 
         this.shouldStop = false;
@@ -187,23 +187,24 @@ private void processBatches() {
                 if (batch == null) {
                     continue;
                 }
-                long batchSnapshotId = batch.getSnapshotId();
-                logger.debug("polled one batch [" + batchSnapshotId + "]");
+                long batchSI = batch.getSnapshotId();
+                logger.debug("polled one batch [" + batchSI + "]");
                 boolean hasDdl = writeEngineWithRetry(batch);
                 this.totalWrite += batch.getSize();
-                if (this.consumeSnapshotId < batchSnapshotId) {
+                if (this.consumeSI < batchSI) {
                     SnapshotInfo availSInfo = this.availSnapshotInfoRef.get();
-                    long availSI = Math.max(availSInfo.getSnapshotId(), batchSnapshotId - 1);
+                    long availSI = Math.max(availSInfo.getSnapshotId(), batchSI - 1);
                     long availDdlSI = Math.max(availSInfo.getDdlSnapshotId(), consumeDdlSnapshotId);
-                    this.consumeSnapshotId = batchSnapshotId;
+                    this.consumeSI = batchSI;
                     this.availSnapshotInfoRef.set(new SnapshotInfo(availSI, availDdlSI));
                     this.commitExecutor.execute(this::asyncCommit);
+                } else {
+                    logger.warn("consumedSI {} >= batchSI {}, ignored", consumeSI, batchSI);
                 }
                 if (hasDdl) {
-                    this.consumeDdlSnapshotId = batchSnapshotId;
+                    this.consumeDdlSnapshotId = batchSI;
                 }
-                //                this.consumedQueueOffsets.set(batch.getQueueId(),
-                // batch.getOffset());
+                // this.consumedQueueOffsets.set(batch.getQueueId(), batch.getOffset());
                 this.consumedQueueOffsets.set(0, batch.getOffset());
             } catch (InterruptedException e) {
                 logger.error("processBatches interrupted");
@@ -215,22 +216,20 @@ private void processBatches() {
 
     private void asyncCommit() {
         SnapshotInfo snapshotInfo = this.availSnapshotInfoRef.get();
-        long availSnapshotId = snapshotInfo.getSnapshotId();
-        if (availSnapshotId > this.lastCommitSnapshotId) {
+        long curSI = snapshotInfo.getSnapshotId();
+        if (curSI > this.lastCommitSI) {
             long ddlSnapshotId = snapshotInfo.getDdlSnapshotId();
             List<Long> queueOffsets = new ArrayList<>(this.consumedQueueOffsets);
             try {
                 // logger.info("commit SI {}, last DDL SI {}", availSnapshotId, ddlSnapshotId);
                 this.snapshotCommitter.commitSnapshotId(
-                        storeId, availSnapshotId, ddlSnapshotId, queueOffsets);
-                this.lastCommitSnapshotId = availSnapshotId;
+                        storeId, curSI, ddlSnapshotId, queueOffsets);
+                this.lastCommitSI = curSI;
             } catch (Exception e) {
-                logger.warn(
-                        "commit failed. SI {}, offset {}. ignored",
-                        availSnapshotId,
-                        queueOffsets,
-                        e);
+                logger.warn("commit failed. SI {}, offset {}. ignored", curSI, queueOffsets, e);
             }
+        } else {
+            logger.warn("curSI {} <= lastCommitSI {}, ignored", curSI, lastCommitSI);
         }
     }