Cached copies of documents may become out of date and obsolete. What can be done to reduce this problem?


Most reliable method:

Master server (owner of original) updates mirrors when a document is changed.

Other methods:

  • The master can supply time-to-live
  • Restore all documents older than certain limit
  • Restore depending on how new the document was when loaded
  • Restore automatically in the background
  • Use HTTP feature to check last update and only download if document is changed
  • User pushes reload button


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