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View Code? Open in Web Editor NEWAppend-only B+tree Erlang Term Storage (pure disk based)
Append-only B+tree Erlang Term Storage (pure disk based)
N.B. This is work in progress, and doesn't actually work. Append-only B+tree Erlang Term Storage (pure disk based) abets is intended as a complement to dets, the standard Erlang term disk storage utility. It aims to rectify some bad properties of dets; 1) no ordered set semantics 2) no graceful handling of force closed files 3) 2 GB limit per dets file 4) it's not disk-only (it will use some RAM) 5) dets has (as of 2010) at least one data-loss bug This can be achieved by different trade-offs; 1) dets is normally faster 2) dets has less disk space overhead Just like Erlang itself, abets will never modify data. But data can become unreferenced, and subsequently garbage collected. So, if data integrity, crash resiliency, +2GB tables or ordered set semantics are more important than CPU time and disk space, abets will be a win. Alas, dets also has the advantage of +10 year field testing, while abets is partly vaporware. abets is inspired by the eminent CouchDB (couchdb.apache.org), but aims to be a more generic implementation of an Append-only B+tree data structure.
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