Translators/performance/quick-read

From GlusterDocumentation

Translator performance/quick-read

This translator improves performance of read on small files. Over a posix interface, files are read using the apis open, read and close. For a filesystem implemented over a network, the round trip overhead of these calls can be significant. Hence quick-read uses the glusterfs internal get interface to implement posix abstraction of using open/read/close for reading of files there by reducing the number of calls over network from n to 1 where n = no of read calls + 1 (open) + 1 (close).

Example:

volume quick-read
  type performance/quick-read
  option cache-timeout nsecs (1 second)
  option max-file-size nbytes (64Kb)
  subvolumes client
end-volume

cache-timeout

Timeout for validation of cached file. On timeout stats of the file is compared with that of cached copy. If the file is found to be changed after it is cached, the cache is flushed. The default timeout value is 1 second.

max-file-size

Maximum size of the file that can be fetched using get interface. Files bigger than this are read using the normal open/read/close. Note that this option controls only how quick-read behaves. Irrespective of the value this option, the applications running on glusterfs continue to use the normal open/read/close interface. Default value of this option is 64 kilo bytes.

Retrieved from "http://gluster.org/community/documentation/index.php/Translators/performance/quick-read"