eclipse - SSH(FTP)和Web服务器并发文件IO

Question

我有一个带有 Apache 的服务器。

我在对一个文件进行并发读写操作时遇到问题。

假设我在 Apache DocRoot 中有 index.html 文件。在浏览器中我可以打开阅读它。

我正在使用 Eclipse IDE 通过 SSH(或 FTP)直接修改服务器上的文件。 对文件进行一些更改后，我将其上传到服务器。上传需要一些时间。

问题是:如果我尝试在浏览器中查看文件，而文件正在上传，则上传挂起并且目标文件变为空白。看起来 apache 和 SSH 服务器都试图访问文件，SSH 写入，Apache 读取。碰撞打破了一切。

有什么办法可以避免这种情况吗？也许是一些 SSH 服务器配置选项或 Apache 模块？

Answer 1

您需要先锁定文件。你知道你使用什么操作系统和apache配置吗，是你自己的系统吗？

这里引用了 apache 服务器文档:

EnableMMAP Directive


Description:
Use memory-mapping to read files during delivery 

Syntax:
EnableMMAP On|Off 

Default:
EnableMMAP On 

Context:
server config, virtual host, directory, .htaccess 

Override:
FileInfo 

Status:
Core 

Module:
core 

This directive controls whether the httpd may use memory-mapping if it needs to read the contents of a file during delivery. By default, when the handling of a request requires access to the data within a file -- for example, when delivering a server-parsed file using mod_include -- Apache httpd memory-maps the file if the OS supports it.

This memory-mapping sometimes yields a performance improvement. But in some environments, it is better to disable the memory-mapping to prevent operational problems:
•On some multiprocessor systems, memory-mapping can reduce the performance of the httpd.
•Deleting or truncating a file while httpd has it memory-mapped can cause httpd to crash with a segmentation fault. 

For server configurations that are vulnerable to these problems, you should disable memory-mapping of delivered files by specifying:
EnableMMAP Off

For NFS mounted files, this feature may be disabled explicitly for the offending files by specifying:

  EnableMMAP Off

由于您的服务器崩溃了，我怀疑您为文件所在的目录“设置”了此选项。

添加

AllowMMAP Off

到您目录的 .htaccess 文件。