Delegate parquet creation to s3sync instead (#117)

Co-authored-by: Satyam Singh <trueleo@protonmail.com>

Author: nitisht

server/src/metadata.rs

@@ -172,6 +172,7 @@ impl STREAM_INFO {
         self.read().unwrap().keys().map(String::clone).collect()
     }
 
+    #[allow(dead_code)]
     pub fn update_stats(
         &self,
         stream_name: &str,

server/src/storage.rs

@@ -100,38 +100,32 @@ pub trait ObjectStorage: Sync + 'static {
                 continue;
             }
 
-            match sync.move_local_to_temp() {
-                Ok(parquet_size) => {
-                    if let Err(e) = STREAM_INFO.update_stats(&stream, 0, parquet_size) {
-                        log::error!("Couldn't update stream stats. {:?}", e);
-                    }
-                }
-                Err(e) => {
-                    log::error!(
-                        "Error copying parquet from stream directory in [{}] to tmp directory [{}] due to error [{}]",
-                        sync.dir.data_path.to_string_lossy(),
-                        sync.dir.temp_dir.to_string_lossy(),
-                        e
-                    );
-                    continue;
-                }
+            if let Err(e) = sync.move_local_to_temp() {
+                log::error!(
+                    "Error copying parquet from stream directory in [{}] to tmp directory [{}] due to error [{}]",
+                    sync.dir.data_path.to_string_lossy(),
+                    sync.dir.temp_dir.to_string_lossy(),
+                    e
+                );
+                continue;
             }
         }
 
         Ok(())
     }
 
-    async fn s3_sync(&self) -> Result<(), ObjectStorageError> {
+    async fn s3_sync(&self) -> Result<(), MoveDataError> {
         if !Path::new(&CONFIG.parseable.local_disk_path).exists() {
             return Ok(());
         }
 
         let streams = STREAM_INFO.list_streams();
 
         for stream in streams {
+            // get dir
             let dir = StorageDir::new(stream.clone());
-
-            for file in WalkDir::new(dir.temp_dir)
+            // walk dir, find all .tmp files and convert to parquet
+            for file in WalkDir::new(&dir.temp_dir)
                 .min_depth(1)
                 .max_depth(1)
                 .into_iter()
@@ -144,7 +138,55 @@ pub trait ObjectStorage: Sync + 'static {
                         None => false,
                     };
 
-                    !is_tmp
+                    is_tmp
+                })
+            {
+                let record_tmp_file = file.file_name().unwrap().to_str().unwrap();
+                let file = File::open(&file).map_err(|_| MoveDataError::Open)?;
+                let reader = StreamReader::try_new(file, None)?;
+                let schema = reader.schema();
+                let records = reader.filter_map(|record| match record {
+                    Ok(record) => Some(record),
+                    Err(e) => {
+                        log::warn!("error when reading from arrow stream {:?}", e);
+                        None
+                    }
+                });
+
+                let parquet_path = dir.temp_dir.join(
+                    record_tmp_file
+                        .strip_suffix(".tmp")
+                        .expect("file has a .tmp extention"),
+                );
+                let parquet_file =
+                    fs::File::create(&parquet_path).map_err(|_| MoveDataError::Create)?;
+                let props = WriterProperties::builder().build();
+                let mut writer = ArrowWriter::try_new(parquet_file, schema, Some(props))?;
+
+                for ref record in records {
+                    writer.write(record)?;
+                }
+
+                writer.close()?;
+
+                fs::remove_file(dir.temp_dir.join(record_tmp_file))
+                    .map_err(|_| MoveDataError::Delete)?;
+            }
+
+            for file in WalkDir::new(dir.temp_dir)
+                .min_depth(1)
+                .max_depth(1)
+                .into_iter()
+                .filter_map(|file| file.ok())
+                .map(|file| file.path().to_path_buf())
+                .filter(|file| file.is_file())
+                .filter(|file| {
+                    let is_parquet = match file.extension() {
+                        Some(ext) => ext.eq_ignore_ascii_case("parquet"),
+                        None => false,
+                    };
+
+                    is_parquet
                 })
             {
                 let filename = file.file_name().unwrap().to_str().unwrap();
@@ -195,40 +237,11 @@ impl StorageDir {
         fs::create_dir_all(&self.temp_dir)
     }
 
-    pub fn move_local_to_temp(&self, filename: String) -> Result<u64, MoveDataError> {
-        let record_tmp_file_path = self.temp_dir.join(filename.clone() + ".tmp");
-        fs::rename(self.data_path.join("data.records"), &record_tmp_file_path)
-            .map_err(|_| MoveDataError::Rename)?;
+    pub fn move_local_to_temp(&self, filename: String) -> io::Result<()> {
+        let record_tmp_file_path = self.temp_dir.join(filename + ".tmp");
+        fs::rename(self.data_path.join("data.records"), &record_tmp_file_path)?;
         event::STREAM_WRITERS::unset_entry(&self.stream_name).unwrap();
-        let file = File::open(&record_tmp_file_path).map_err(|_| MoveDataError::Open)?;
-        let reader = StreamReader::try_new(file, None)?;
-        let schema = reader.schema();
-        let records = reader.filter_map(|record| match record {
-            Ok(record) => Some(record),
-            Err(e) => {
-                log::warn!("error when reading from arrow stream {:?}", e);
-                None
-            }
-        });
-
-        let parquet_path = self.temp_dir.join(filename);
-        let parquet_file = fs::File::create(&parquet_path).map_err(|_| MoveDataError::Create)?;
-        let props = WriterProperties::builder().build();
-        let mut writer = ArrowWriter::try_new(parquet_file, schema, Some(props))?;
-
-        for ref record in records {
-            writer.write(record)?;
-        }
-
-        writer.close()?;
-
-        fs::remove_file(record_tmp_file_path).map_err(|_| MoveDataError::Delete)?;
-
-        let compressed_size = fs::metadata(parquet_path)
-            .map_err(|_| MoveDataError::Metadata)?
-            .len();
-
-        Ok(compressed_size)
+        Ok(())
     }
 
     pub fn local_data_exists(&self) -> bool {
@@ -238,20 +251,18 @@ impl StorageDir {
 
 #[derive(Debug, thiserror::Error)]
 pub enum MoveDataError {
-    #[error("Failed to rename file")]
-    Rename,
     #[error("Unable to Open file after moving")]
     Open,
     #[error("Unable to create recordbatch stream")]
     Arrow(#[from] ArrowError),
     #[error("Could not generate parquet file")]
     Parquet(#[from] ParquetError),
+    #[error("Object Storage Error {0}")]
+    ObjectStorag(#[from] ObjectStorageError),
     #[error("Could not generate parquet file")]
     Create,
     #[error("Could not delete temp arrow file")]
     Delete,
-    #[error("Could not fetch metadata of moved parquet file")]
-    Metadata,
 }
 
 struct StorageSync {
@@ -266,7 +277,7 @@ impl StorageSync {
         Self { dir, time }
     }
 
-    fn move_local_to_temp(&self) -> Result<u64, MoveDataError> {
+    fn move_local_to_temp(&self) -> io::Result<()> {
         let time = self.time - Duration::minutes(OBJECT_STORE_DATA_GRANULARITY as i64);
         let uri = utils::date_to_prefix(time.date())
             + &utils::hour_to_prefix(time.hour())