From 10f99fdfd2160ac8a1285d7a37b6de4294373e0c Mon Sep 17 00:00:00 2001
From: Chris Lu <chris.lu@gmail.com>
Date: Tue, 17 Mar 2026 11:27:54 -0700
Subject: [PATCH] Match Go VolumeEcShardsCopy: append to .ecj file instead of
 truncating

---
 seaweed-volume/src/server/grpc_server.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/seaweed-volume/src/server/grpc_server.rs b/seaweed-volume/src/server/grpc_server.rs
index 22de8eb0b..bf659c257 100644
--- a/seaweed-volume/src/server/grpc_server.rs
+++ b/seaweed-volume/src/server/grpc_server.rs
@@ -2247,7 +2247,10 @@ impl VolumeServer for VolumeGrpcService {
                     crate::storage::volume::volume_file_name(&dest_idx_dir, &req.collection, vid);
                 format!("{}.ecj", base)
             };
-            let mut file = std::fs::File::create(&file_path)
+            let mut file = std::fs::OpenOptions::new()
+                .create(true)
+                .append(true)
+                .open(&file_path)
                 .map_err(|e| Status::internal(format!("create {}: {}", file_path, e)))?;
             while let Some(chunk) = stream
                 .message()