tweaking the 2 migration task logging messages

lang/zh_cn.yml

@@ -222,7 +222,7 @@ prime_backup:
       start: 正在将压缩方法迁移至{}，见控制台以了解进度
       no_confirm: 未做出选择, 压缩方法迁移任务终止
       aborted: 压缩方法迁移任务终止
-      done: '已将压缩方法迁移至{}, 数据对象总储存大小变化: {} -> {} ({})'
+      done: '已将压缩方法迁移至{}, 数据对象总储存大小: {} -> {} ({})'
     db_migrate_hash_method:
       name: 哈希算法迁移
       hash_method_unchanged: 哈希算法已经是{}了

prime_backup/action/migrate_compress_method_action.py

@@ -89,30 +89,30 @@ def run(self) -> SizeDiff:
 				cnt = 0
 				for blobs in session.iterate_blob_batch(batch_size=1000):
 					cnt += len(blobs)
-					self.logger.info('Migrating blobs {} / {}'.format(cnt, total_blob_count))
+					self.logger.info('Processing blobs {} / {}'.format(cnt, total_blob_count))
 					self.__migrate_blobs_and_sync_files(session, blobs)
 					session.flush_and_expunge_all()
 
 				if len(self.__migrated_blob_hashes) == 0:
-					self.logger.info('No blob is changed, no need to migrate')
+					self.logger.info('No blob needs a compress method change, nothing to migrate')
 				else:
 					self.logger.info('Migrated {} blobs and related files'.format(len(self.__migrated_blob_hashes)))
 
 					# 3. migrate backup data
-					self.logger.info('Syncing {} backups'.format(len(self.__affected_backup_ids)))
+					self.logger.info('Syncing {} affected backups'.format(len(self.__affected_backup_ids)))
 					self.__update_backups(session)
 					session.flush_and_expunge_all()
 
 					# 4. finalize blob file change
-					self.logger.info('Finalize blob file change')
+					self.logger.info('Finalizing blob file change')
 					self.__finalize_blobs_change()
 					session.flush_and_expunge_all()
 
 				# 5. output
 				after_size = session.get_blob_stored_size_sum()
 
 			self.config.backup.compress_method = self.new_compress_method
-			self.logger.info('Migration done, cost {}s'.format(round(time.time() - t, 2)))
+			self.logger.info('Compress method migration done, cost {}s'.format(round(time.time() - t, 2)))
 			return SizeDiff(before_size, after_size)
 
 		finally:

prime_backup/action/migrate_hash_method_action.py

@@ -59,6 +59,8 @@ def run(self):
 					self.logger.info('Hash method of the database is already {}, no need to migrate'.format(self.new_hash_method.name))
 					return
 
+				self.logger.info('Migrating hash method from {} to {}'.format(meta.hash_method, self.new_hash_method.name))
+
 				total_blob_count = session.get_blob_count()
 				all_hashes = session.get_all_blob_hashes()
 				all_hash_set = set(all_hashes)
@@ -78,7 +80,7 @@ def run(self):
 			DbAccess.sync_hash_method()
 			self.config.backup.hash_method = self.new_hash_method.name
 
-			self.logger.info('Migration done, cost {}s'.format(round(time.time() - t, 2)))
+			self.logger.info('Hash method migration done, cost {}s'.format(round(time.time() - t, 2)))
 
 		except Exception:
 			self.logger.warning('Error occurs during migration, applying rollback')