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Clarified counters

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arkpar 2016-02-07 11:50:56 +01:00
parent f2ed89be46
commit b2f69a08ca
1 changed files with 6 additions and 4 deletions
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10
util/src/journaldb.rs
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@ -106,10 +106,12 @@ impl JournalDB {
// we remove all of its removes assuming it is canonical and all
// of its inserts otherwise.
//
// we also keep track of the counters for each key inserted in the journal to handle the following cases:
// key K is removed in block A(N) and re-inserted in block B(N + C) (where C < H). K must not be deleted from the DB.
// key K is added in block A(N) and reverted in block B(N + C) (where C < H). K must be deleted
// key K is added in blocks A(N) and A'(N) and is reverted in block B(N + C ) (where C < H). K must not be deleted
// we also keep track of the counters for each key inserted in the journal to handle
// the following cases where key K must not be deleted from the DB:
// Given H is the journal size in eras, 0 <= C <= H.
// Key K is removed in era A(N) and re-inserted in canonical era B(N + C).
// Key K is removed in era A(N) and re-inserted in non-canonical era B`(N + C).
// Key K is added in canonical era A(N) and non-canonicnal B'(N + C).
// record new commit's details.
let batch = WriteBatch::new();