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<  User Contributions  ~  A version of dets that never enters the repair mode
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Posted: Thu Aug 16, 2007 9:06 am Reply with quote
Site Admin Joined: 28 Jun 2006 Posts: 108
Written By: Claes Wikstrom,
This module xports exactly the same interface as the original dets module in erlang 47.4.1 with the exceptio that the {ok, Handle} that is returned by the open_file/2 function can only be used by the the process that issued the open_file/2 The idea here is to use two dets files instead of one All write ops go into one dets file as well as into a log. Whenever ?WRITE_THRESHOLD write ops have been done, the log is transfered into the second dets file **while** the original dets file is closed. This way we get dets files that can be opened for writing at runtime and they will never be subject to repair. This means that we can have very very large dets files. The time to repair a dets file with say 1.000.000 objects in it can be very large, maybe upto 12 hours which typically is not acceptable . the downside is that that write ops take more than twice the time (in mean) to execute as well the file space which is doubled.


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