python - 什么条件导致 Tokyo Cabinet 阻挠

Question

我在 python 中使用 Tokyo Cabinet 和 tc 模块。我以 TDB 格式存储我的数据。我希望该表仅在写入期间阻塞。不幸的是，我看到当文件以“编写器模式”打开时，其他进程无法从中读取。这是标准行为、包装器问题，还是我做错了什么？或者可能还有其他情况导致操作受阻？

Answer 1

根据 specification :

Tokyo Cabinet provides two modes to connect to a database: "reader" and "writer". A reader can perform retrieving but neither storing nor deleting. A writer can perform all access methods. Exclusion control between processes is performed when connecting to a database by file locking. While a writer is connected to a database, neither readers nor writers can be connected. While a reader is connected to a database, other readers can be connect, but writers can not. According to this mechanism, data consistency is guaranteed with simultaneous connections in multitasking environment.

您可以为每个写入操作创建和关闭写入器，或者使用 Tokyo Tyrant 提供并发访问。