Start btree_damage_visitor.
This commit is contained in:
Joe Thornber
parent
f6acd473a7
commit
23ef3b387d
251
persistent-data/data-structures/btree_damage_visitor.h
Normal file
251
persistent-data/data-structures/btree_damage_visitor.h
Normal file
|
|
@ -0,0 +1,251 @@
|
|||
#ifndef PERSISTENT_DATA_DATA_STRUCTURES_DAMAGE_VISITOR_H
|
||||
#define PERSISTENT_DATA_DATA_STRUCTURES_DAMAGE_VISITOR_H
|
||||
|
||||
#include "persistent-data/data-structures/btree.h"
|
||||
|
||||
//----------------------------------------------------------------
|
||||
|
||||
namespace persistent_data {
|
||||
|
||||
//----------------------------------------------------------------
|
||||
|
||||
// This class implements consistency checking for the btrees. It
|
||||
// also allows the caller to visit all accessible values.
|
||||
|
||||
// Derive from this if you want some additional checks. It's worth
|
||||
// summarising what is checked:
|
||||
|
||||
//
|
||||
// Implemented
|
||||
// -----------
|
||||
//
|
||||
// - block_nr
|
||||
// - nr_entries < max_entries
|
||||
// - max_entries fits in block
|
||||
// - max_entries is divisible by 3
|
||||
// - nr_entries > minimum (except for root nodes)
|
||||
//
|
||||
// Not implemented
|
||||
// ---------------
|
||||
//
|
||||
// - leaf | internal flags (this can be inferred from siblings)
|
||||
|
||||
//----------------------------------------------------------------
|
||||
|
||||
template <typename ValueVisitor, typename DamageVisitor, uint32_t Levels, typename ValueTraits>
|
||||
class btree_damage_visitor : public btree<Levels, ValueTraits>::visitor {
|
||||
public:
|
||||
typedef btree_detail::node_location node_location;
|
||||
|
||||
btree_damage_visitor(block_counter &counter,
|
||||
ValueVisitor &value_visitor,
|
||||
DamageVisitor &damage_visitor)
|
||||
: counter_(counter),
|
||||
avoid_repeated_visits_(true),
|
||||
value_visitor_(value_visitor),
|
||||
damage_visitor_(damage_visitor) {
|
||||
}
|
||||
|
||||
bool visit_internal(node_location const &loc,
|
||||
btree_detail::node_ref<uint64_traits> const &n) {
|
||||
return check_internal(loc, n);
|
||||
}
|
||||
|
||||
bool visit_internal_leaf(node_location const &loc,
|
||||
btree_detail::node_ref<uint64_traits> const &n) {
|
||||
return check_leaf(loc, n);
|
||||
}
|
||||
|
||||
bool visit_leaf(node_location const &loc,
|
||||
btree_detail::node_ref<ValueTraits> const &n) {
|
||||
return check_leaf(loc, n);
|
||||
}
|
||||
|
||||
private:
|
||||
bool check_internal(node_location const &loc,
|
||||
btree_detail::node_ref<uint64_traits> const &n) {
|
||||
if (!already_visited(n) &&
|
||||
check_block_nr(n) &&
|
||||
check_max_entries(n) &&
|
||||
check_nr_entries(n, loc.sub_root) &&
|
||||
check_ordered_keys(n) &&
|
||||
check_parent_key(loc.sub_root ? optional<uint64_t>() : loc.key, n)) {
|
||||
if (loc.sub_root)
|
||||
new_root(loc.level);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
template <typename ValueTraits2>
|
||||
bool check_leaf(node_location const &loc,
|
||||
btree_detail::node_ref<ValueTraits2> const &n) {
|
||||
if (!already_visited(n) &&
|
||||
check_block_nr(n) &&
|
||||
check_max_entries(n) &&
|
||||
check_nr_entries(n, loc.sub_root) &&
|
||||
check_ordered_keys(n) &&
|
||||
check_parent_key(loc.sub_root ? optional<uint64_t>() : loc.key, n)) {
|
||||
if (loc.sub_root)
|
||||
new_root(loc.level);
|
||||
|
||||
return check_leaf_key(loc.level, n);
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
|
||||
template <typename node>
|
||||
bool already_visited(node const &n) {
|
||||
block_address b = n.get_location();
|
||||
|
||||
counter_.inc(b);
|
||||
|
||||
if (avoid_repeated_visits_) {
|
||||
if (seen_.count(b) > 0)
|
||||
return true;
|
||||
|
||||
seen_.insert(b);
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
template <typename node>
|
||||
bool check_block_nr(node const &n) const {
|
||||
if (n.get_location() != n.get_block_nr()) {
|
||||
std::ostringstream out;
|
||||
out << "block number mismatch: actually "
|
||||
<< n.get_location()
|
||||
<< ", claims " << n.get_block_nr();
|
||||
//errs_->add_child(out.str());
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
template <typename node>
|
||||
bool check_max_entries(node const &n) const {
|
||||
size_t elt_size = sizeof(uint64_t) + n.get_value_size();
|
||||
if (elt_size * n.get_max_entries() + sizeof(node_header) > MD_BLOCK_SIZE) {
|
||||
std::ostringstream out;
|
||||
out << "max entries too large: " << n.get_max_entries();
|
||||
//errs_->add_child(out.str());
|
||||
return false;
|
||||
}
|
||||
|
||||
if (n.get_max_entries() % 3) {
|
||||
std::ostringstream out;
|
||||
out << "max entries is not divisible by 3: " << n.get_max_entries();
|
||||
//errs_->add_child(out.str());
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
template <typename node>
|
||||
bool check_nr_entries(node const &n, bool is_root) const {
|
||||
if (n.get_nr_entries() > n.get_max_entries()) {
|
||||
std::ostringstream out;
|
||||
out << "bad nr_entries: "
|
||||
<< n.get_nr_entries() << " < "
|
||||
<< n.get_max_entries();
|
||||
//errs_->add_child(out.str());
|
||||
return false;
|
||||
}
|
||||
|
||||
block_address min = n.get_max_entries() / 3;
|
||||
if (!is_root && (n.get_nr_entries() < min)) {
|
||||
ostringstream out;
|
||||
out << "too few entries in btree: "
|
||||
<< n.get_nr_entries()
|
||||
<< ", expected at least "
|
||||
<< min
|
||||
<< "(max_entries = " << n.get_max_entries() << ")";
|
||||
//errs_->add_child(out.str());
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
template <typename node>
|
||||
bool check_ordered_keys(node const &n) const {
|
||||
unsigned nr_entries = n.get_nr_entries();
|
||||
|
||||
if (nr_entries == 0)
|
||||
return true; // can only happen if a root node
|
||||
|
||||
uint64_t last_key = n.key_at(0);
|
||||
|
||||
for (unsigned i = 1; i < nr_entries; i++) {
|
||||
uint64_t k = n.key_at(i);
|
||||
if (k <= last_key) {
|
||||
ostringstream out;
|
||||
out << "keys are out of order, " << k << " <= " << last_key;
|
||||
//errs_->add_child(out.str());
|
||||
return false;
|
||||
}
|
||||
last_key = k;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
template <typename node>
|
||||
bool check_parent_key(boost::optional<uint64_t> key, node const &n) const {
|
||||
if (!key)
|
||||
return true;
|
||||
|
||||
if (*key > n.key_at(0)) {
|
||||
ostringstream out;
|
||||
out << "parent key mismatch: parent was " << *key
|
||||
<< ", but lowest in node was " << n.key_at(0);
|
||||
//errs_->add_child(out.str());
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
template <typename node>
|
||||
bool check_leaf_key(unsigned level, node const &n) {
|
||||
if (n.get_nr_entries() == 0)
|
||||
return true; // can only happen if a root node
|
||||
|
||||
if (last_leaf_key_[level] && *last_leaf_key_[level] >= n.key_at(0)) {
|
||||
ostringstream out;
|
||||
out << "the last key of the previous leaf was " << *last_leaf_key_[level]
|
||||
<< " and the first key of this leaf is " << n.key_at(0);
|
||||
//errs_->add_child(out.str());
|
||||
return false;
|
||||
}
|
||||
|
||||
last_leaf_key_[level] = n.key_at(n.get_nr_entries() - 1);
|
||||
return true;
|
||||
}
|
||||
|
||||
void new_root(unsigned level) {
|
||||
// we're starting a new subtree, so should
|
||||
// reset the last_leaf value.
|
||||
last_leaf_key_[level] = boost::optional<uint64_t>();
|
||||
}
|
||||
|
||||
block_counter &counter_;
|
||||
bool avoid_repeated_visits_;
|
||||
ValueVisitor &value_visitor_;
|
||||
DamageVisitor &damage_visitor_;
|
||||
|
||||
std::set<block_address> seen_;
|
||||
boost::optional<uint64_t> last_leaf_key_[Levels];
|
||||
};
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------
|
||||
|
||||
#endif
|
||||
|
|
@ -47,6 +47,7 @@ TEST_SOURCE=\
|
|||
unit-tests/bitset_t.cc \
|
||||
unit-tests/block_t.cc \
|
||||
unit-tests/btree_t.cc \
|
||||
unit-tests/btree_damage_visitor_t.cc \
|
||||
unit-tests/buffer_t.cc \
|
||||
unit-tests/cache_t.cc \
|
||||
unit-tests/endian_t.cc \
|
||||
|
|
|
|||
38
unit-tests/btree_damage_visitor_t.cc
Normal file
38
unit-tests/btree_damage_visitor_t.cc
Normal file
|
|
@ -0,0 +1,38 @@
|
|||
#include "gmock/gmock.h"
|
||||
|
||||
#include "test_utils.h"
|
||||
|
||||
#include "persistent-data/transaction_manager.h"
|
||||
#include "persistent-data/space-maps/core.h"
|
||||
#include "persistent-data/data-structures/btree_damage_visitor.h"
|
||||
|
||||
using namespace std;
|
||||
using namespace persistent_data;
|
||||
using namespace test;
|
||||
using namespace testing;
|
||||
|
||||
//----------------------------------------------------------------
|
||||
|
||||
namespace {
|
||||
block_address const BLOCK_SIZE = 4096;
|
||||
block_address const NR_BLOCKS = 102400;
|
||||
|
||||
class BTreeDamageVisitorTests : public Test {
|
||||
public:
|
||||
BTreeDamageVisitorTests()
|
||||
: bm_(create_bm<BLOCK_SIZE>(NR_BLOCKS)) {
|
||||
}
|
||||
|
||||
with_temp_directory dir_;
|
||||
block_manager<>::ptr bm_;
|
||||
};
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------
|
||||
|
||||
TEST_F(BTreeDamageVisitorTests, null_test)
|
||||
{
|
||||
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------
|
||||
Loading…
Reference in New Issue
Block a user