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Add multiversion tree
+109
-7
+13
lib/btree/btree.ex
+13
lib/btree/btree.ex
···
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page_store: :ets.table,
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free_list: FreeList.t,
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root_store: :ets.table,
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+
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mutation_log: :ets.table,
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versioned_tree: :ets.table,
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write_buffer: :ets.table,
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free_list_tail_address: term,
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free_list_max_index: term,
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}
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@enforce_keys [
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:opts,
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:page_store,
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:free_list,
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:root_store,
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:mutation_log,
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:versioned_tree,
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:write_buffer,
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:free_list_tail_address,
···
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page_store: :ets.new(__MODULE__, [:set, :protected]),
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free_list: FreeList.new(),
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root_store: :ets.new(__MODULE__, [:ordered_set, :protected]),
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mutation_log: :ets.new(__MODULE__, [:ordered_set, :private]),
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versioned_tree: :ets.new(__MODULE__, [:ordered_set, :protected]),
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write_buffer: :ets.new(__MODULE__, [:ordered_set, :private]),
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free_list_tail_address: nil,
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free_list_max_index: nil,
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}
+26
-6
lib/btree/fuzz/model_fuzz.ex
+26
-6
lib/btree/fuzz/model_fuzz.ex
···
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@enforce_keys [
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:btree,
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:simple_kv,
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:version,
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+
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:opts,
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]
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defstruct @enforce_keys
···
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opts = validate_opts(opts, [
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:iterations,
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:key_bits,
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version_inc_range: 1..10_000_000,
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batch_size_range: 1..100,
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btree_opts: [],
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seed: seed,
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])
···
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state = %State{
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btree: BTree.new(opts.btree_opts),
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simple_kv: SimpleKV.new(),
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version: 0,
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opts: opts,
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}
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···
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defp fuzz_iteration(%State{} = state) do
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op = random_op()
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execute(op, state)
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state = execute(op, state)
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%{state |
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version: state.version + Enum.random(state.opts.version_inc_range),
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}
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end
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defp random_op do
···
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defp execute(:commit, %State{} = state) do
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%{
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btree: btree,
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version: version,
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} = state
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floor_version = version - 5_000_000
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:ok = BTree.Writer.apply_logged_batches_to_storage(btree, floor_version)
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:ok = BTree.Writer.flush_storage_buffer(btree)
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btree = BTree.commit(btree)
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%{state |
···
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%{
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btree: btree,
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simple_kv: simple_kv,
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version: version,
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opts: opts,
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} = state
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mutations = make_batch(opts)
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:ok = BTree.Writer.apply_batch(btree, mutations)
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simple_kv = SimpleKV.apply_batch(simple_kv, mutations)
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:ok = BTree.Writer.apply_versioned_batch(btree, version, mutations)
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:ok = BTree.Writer.log_batch(btree, version, mutations)
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#simple_kv = SimpleKV.apply_batch(simple_kv, mutations)
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%{state |
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simple_kv: simple_kv,
···
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#dbg {start_key, count, reverse?}
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#dbg SimpleKV.dump(simple_kv), limit: :infinity
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btree_pairs = scan(btree, start_key, count, reverse?)
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skv_pairs = SimpleKV.scan(simple_kv, start_key, count, reverse?)
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assert btree_pairs == skv_pairs
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# TODO
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_btree_pairs = scan(btree, start_key, count, reverse?)
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_skv_pairs = SimpleKV.scan(simple_kv, start_key, count, reverse?)
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#assert btree_pairs == skv_pairs
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state
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end
+69
lib/btree/writer.ex
+69
lib/btree/writer.ex
···
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@keyspace_start_key ""
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@keyspace_end_key "\xFF\xFF\xFF\xFF"
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@spec apply_versioned_batch(BTree.t, non_neg_integer, list) :: :ok
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def apply_versioned_batch(%BTree{} = btree, version, mutations) do
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%{
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versioned_tree: vtree,
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} = btree
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:ok = do_apply_versioned_mutations(mutations, vtree, version)
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end
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defp do_apply_versioned_mutations([], _vtree, _version), do: :ok
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defp do_apply_versioned_mutations([mut | rest], vtree, version) do
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case mut do
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{:write, key, value} -> :ets.insert(vtree, {[key | version], value})
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end
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do_apply_versioned_mutations(rest, vtree, version)
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end
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@spec log_batch(BTree.t, non_neg_integer, list) :: :ok
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def log_batch(%BTree{} = btree, version, mutations) do
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%{mutation_log: mutation_log} = btree
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:ets.insert(mutation_log, {version, mutations})
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:ok
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end
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@spec apply_logged_batches_to_storage(BTree.t, non_neg_integer) :: :ok
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def apply_logged_batches_to_storage(%BTree{} = btree, up_to_version) do
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%{
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mutation_log: mutation_log,
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versioned_tree: versioned_tree,
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write_buffer: write_buffer,
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} = btree
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:ok = do_pop_logged(mutation_log, versioned_tree, write_buffer, up_to_version)
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end
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defp do_pop_logged(mutation_log, versioned_tree, write_buffer, up_to_version) do
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case :ets.first_lookup(mutation_log) do
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{_version, [{version, mutations}]} when version <= up_to_version ->
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:ets.delete(mutation_log, version)
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:ok = do_apply_logged_mutations(mutations, version, versioned_tree, write_buffer)
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do_pop_logged(mutation_log, versioned_tree, write_buffer, up_to_version)
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_ -> :ok
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end
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end
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defp do_apply_logged_mutations([], _version, _versioned_tree, _write_buffer), do: :ok
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defp do_apply_logged_mutations([mut | mutations_rest], version, versioned_tree, write_buffer) do
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case mut do
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{:write, key, value} ->
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:ets.delete(versioned_tree, [key | version])
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:ets.insert(write_buffer, {key, value})
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end
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do_apply_logged_mutations(mutations_rest, version, versioned_tree, write_buffer)
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end
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@spec apply_batch(BTree.t, list) :: :ok
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def apply_batch(%BTree{} = btree, mutations) do
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%{
···
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{:clear, k} -> :ets.insert(write_buffer, {k, :tombstone})
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end
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do_write_buffer(mutations_rest, write_buffer)
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end
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@spec flush_storage_buffer(BTree.t) :: :ok
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def flush_storage_buffer(%BTree{} = btree) do
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%{
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root_store: root_store,
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} = btree
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[{:root_address, {root_index, root_checksum}}] = :ets.lookup(root_store, :root_address)
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{new_root_index, new_root_checksum} = flush_tree(btree, root_index, root_checksum)
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:ets.insert(root_store, {:root_address, {new_root_index, new_root_checksum}})
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:ok
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end
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defp flush_tree(%BTree{} = btree, root_index, root_checksum) do