Lots of work on the btree_damage_visitor
This commit is contained in:
parent
0dba0abe88
commit
88c63f620f
@ -31,6 +31,13 @@ namespace persistent_data {
|
||||
std::string desc_;
|
||||
};
|
||||
|
||||
inline std::ostream &operator <<(std::ostream &out, damage const &d) {
|
||||
out << "btree damage[level = " << d.level_
|
||||
<< ", effected_keys = " << d.lost_keys_
|
||||
<< ", \"" << d.desc_ << "\"]";
|
||||
return out;
|
||||
}
|
||||
|
||||
class damage_tracker {
|
||||
public:
|
||||
damage_tracker()
|
||||
@ -123,6 +130,8 @@ namespace persistent_data {
|
||||
class btree_damage_visitor : public btree<Levels, ValueTraits>::visitor {
|
||||
public:
|
||||
typedef btree_detail::node_location node_location;
|
||||
typedef range<block_address> range64;
|
||||
typedef boost::optional<range64> maybe_range64;
|
||||
|
||||
btree_damage_visitor(block_counter &counter,
|
||||
ValueVisitor &value_visitor,
|
||||
@ -130,8 +139,7 @@ namespace persistent_data {
|
||||
: counter_(counter),
|
||||
avoid_repeated_visits_(true),
|
||||
value_visitor_(value_visitor),
|
||||
damage_visitor_(damage_visitor),
|
||||
key_end_(0) {
|
||||
damage_visitor_(damage_visitor) {
|
||||
}
|
||||
|
||||
bool visit_internal(node_location const &loc,
|
||||
@ -158,6 +166,10 @@ namespace persistent_data {
|
||||
return true;
|
||||
}
|
||||
|
||||
void visit_complete() {
|
||||
end_walk();
|
||||
}
|
||||
|
||||
typedef typename btree<Levels, ValueTraits>::visitor::error_outcome error_outcome;
|
||||
|
||||
error_outcome error_accessing_node(node_location const &l, block_address b,
|
||||
@ -184,8 +196,7 @@ namespace persistent_data {
|
||||
if (loc.sub_root)
|
||||
new_root(loc.level);
|
||||
|
||||
update_key_end(n.key_at(n.get_nr_entries() - 1) + 1ull);
|
||||
|
||||
good_internal(n.key_at(0));
|
||||
return true;
|
||||
}
|
||||
|
||||
@ -205,8 +216,8 @@ namespace persistent_data {
|
||||
new_root(loc.level);
|
||||
|
||||
bool r = check_leaf_key(loc.level, n);
|
||||
if (r)
|
||||
update_key_end(n.key_at(n.get_nr_entries() - 1) + 1ull);
|
||||
if (r && n.get_nr_entries() > 0)
|
||||
good_leaf(n.key_at(0), n.key_at(n.get_nr_entries() - 1) + 1);
|
||||
|
||||
return r;
|
||||
}
|
||||
@ -239,7 +250,7 @@ namespace persistent_data {
|
||||
<< n.get_location()
|
||||
<< ", claims " << n.get_block_nr();
|
||||
|
||||
report_damage(n, out.str());
|
||||
report_damage(out.str());
|
||||
return false;
|
||||
}
|
||||
|
||||
@ -252,14 +263,14 @@ namespace persistent_data {
|
||||
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();
|
||||
report_damage(n, out.str());
|
||||
report_damage(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();
|
||||
report_damage(n, out.str());
|
||||
report_damage(out.str());
|
||||
return false;
|
||||
}
|
||||
|
||||
@ -273,7 +284,7 @@ namespace persistent_data {
|
||||
out << "bad nr_entries: "
|
||||
<< n.get_nr_entries() << " < "
|
||||
<< n.get_max_entries();
|
||||
report_damage(n, out.str());
|
||||
report_damage(out.str());
|
||||
return false;
|
||||
}
|
||||
|
||||
@ -285,7 +296,7 @@ namespace persistent_data {
|
||||
<< ", expected at least "
|
||||
<< min
|
||||
<< "(max_entries = " << n.get_max_entries() << ")";
|
||||
report_damage(n, out.str());
|
||||
report_damage(out.str());
|
||||
return false;
|
||||
}
|
||||
|
||||
@ -306,7 +317,7 @@ namespace persistent_data {
|
||||
if (k <= last_key) {
|
||||
ostringstream out;
|
||||
out << "keys are out of order, " << k << " <= " << last_key;
|
||||
report_damage(n, out.str());
|
||||
report_damage(out.str());
|
||||
return false;
|
||||
}
|
||||
last_key = k;
|
||||
@ -324,7 +335,7 @@ namespace persistent_data {
|
||||
ostringstream out;
|
||||
out << "parent key mismatch: parent was " << *key
|
||||
<< ", but lowest in node was " << n.key_at(0);
|
||||
report_damage(n, out.str());
|
||||
report_damage(out.str());
|
||||
return false;
|
||||
}
|
||||
|
||||
@ -340,7 +351,7 @@ namespace persistent_data {
|
||||
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);
|
||||
report_damage(n, out.str());
|
||||
report_damage(out.str());
|
||||
return false;
|
||||
}
|
||||
|
||||
@ -354,31 +365,56 @@ namespace persistent_data {
|
||||
last_leaf_key_[level] = boost::optional<uint64_t>();
|
||||
}
|
||||
|
||||
void update_key_end(uint64_t end) {
|
||||
key_end_ = max(end, key_end_);
|
||||
}
|
||||
|
||||
template <typename node>
|
||||
void report_damage(node const &n, std::string const &desc) {
|
||||
range<uint64_t> lost_keys(key_end_);
|
||||
damage d(0, lost_keys, desc);
|
||||
|
||||
cerr << "damage: keys = " << lost_keys << " " << desc << endl;
|
||||
damage_visitor_.visit(d);
|
||||
}
|
||||
|
||||
//--------------------------------
|
||||
|
||||
// damage tracking
|
||||
|
||||
void report_damage(std::string const &desc) {
|
||||
range<uint64_t> lost_keys(key_end_);
|
||||
damage d(0, lost_keys, desc);
|
||||
damage_reasons_.push_back(desc);
|
||||
dt_.bad_node();
|
||||
}
|
||||
|
||||
cerr << "damage: keys = " << lost_keys << " " << desc << endl;
|
||||
void good_internal(block_address b) {
|
||||
maybe_range64 mr = dt_.good_internal(b);
|
||||
if (mr)
|
||||
issue_damage(*mr);
|
||||
}
|
||||
|
||||
void good_leaf(block_address b, block_address e) {
|
||||
maybe_range64 mr = dt_.good_leaf(b, e);
|
||||
|
||||
if (mr)
|
||||
issue_damage(*mr);
|
||||
}
|
||||
|
||||
void end_walk() {
|
||||
maybe_range64 mr = dt_.end();
|
||||
if (mr)
|
||||
issue_damage(*mr);
|
||||
}
|
||||
|
||||
void issue_damage(range64 const &r) {
|
||||
// FIXME: we don't really know what level
|
||||
// the damage is coming from
|
||||
damage d(0, r, build_damage_desc());
|
||||
clear_damage_desc();
|
||||
damage_visitor_.visit(d);
|
||||
}
|
||||
|
||||
std::string build_damage_desc() const {
|
||||
std::string r;
|
||||
|
||||
std::list<std::string>::const_iterator it, end = damage_reasons_.end();
|
||||
for (it = damage_reasons_.begin(); it != end; ++it)
|
||||
r += *it;
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
void clear_damage_desc() {
|
||||
damage_reasons_.clear();
|
||||
}
|
||||
|
||||
//--------------------------------
|
||||
|
||||
block_counter &counter_;
|
||||
@ -390,7 +426,8 @@ namespace persistent_data {
|
||||
std::set<block_address> seen_;
|
||||
boost::optional<uint64_t> last_leaf_key_[Levels];
|
||||
|
||||
uint64_t key_end_;
|
||||
damage_tracker dt_;
|
||||
std::list<std::string> damage_reasons_;
|
||||
};
|
||||
}
|
||||
|
||||
|
@ -50,6 +50,7 @@ TEST_SOURCE=\
|
||||
unit-tests/btree_damage_visitor_t.cc \
|
||||
unit-tests/buffer_t.cc \
|
||||
unit-tests/cache_t.cc \
|
||||
unit-tests/damage_tracker_t.cc \
|
||||
unit-tests/endian_t.cc \
|
||||
unit-tests/metadata_checker_t.cc \
|
||||
unit-tests/space_map_t.cc \
|
||||
|
@ -20,21 +20,21 @@ namespace {
|
||||
block_address const SUPERBLOCK = 0;
|
||||
|
||||
struct thing {
|
||||
thing(/* uint32_t x_ = 0, */ uint64_t y_ = 0)
|
||||
: /* x(x_), */
|
||||
thing(uint32_t x_ = 0, uint64_t y_ = 0)
|
||||
: x(x_),
|
||||
y(y_) {
|
||||
}
|
||||
|
||||
bool operator ==(thing const &rhs) const {
|
||||
return /* (x == rhs.x) && */ (y == rhs.y);
|
||||
return (x == rhs.x) && (y == rhs.y);
|
||||
}
|
||||
|
||||
//uint32_t x;
|
||||
uint32_t x;
|
||||
uint64_t y;
|
||||
};
|
||||
|
||||
struct thing_disk {
|
||||
//le32 x;
|
||||
le32 x;
|
||||
le64 y;
|
||||
};
|
||||
|
||||
@ -44,16 +44,101 @@ namespace {
|
||||
typedef persistent_data::no_op_ref_counter<value_type> ref_counter;
|
||||
|
||||
static void unpack(thing_disk const &disk, thing &value) {
|
||||
// value.x = to_cpu<uint32_t>(disk.x);
|
||||
value.x = to_cpu<uint32_t>(disk.x);
|
||||
value.y = to_cpu<uint64_t>(disk.y);
|
||||
}
|
||||
|
||||
static void pack(thing const &value, thing_disk &disk) {
|
||||
// disk.x = to_disk<le32>(value.x);
|
||||
disk.x = to_disk<le32>(value.x);
|
||||
disk.y = to_disk<le64>(value.y);
|
||||
}
|
||||
};
|
||||
|
||||
template <uint32_t Levels, typename ValueTraits>
|
||||
class btree_layout : public btree<Levels, ValueTraits>::visitor {
|
||||
public:
|
||||
struct node_info {
|
||||
typedef boost::shared_ptr<node_info> ptr;
|
||||
|
||||
bool leaf;
|
||||
unsigned depth;
|
||||
unsigned level;
|
||||
block_address b;
|
||||
range<uint64_t> keys;
|
||||
};
|
||||
|
||||
typedef btree_detail::node_location node_location;
|
||||
typedef btree<Levels, ValueTraits> tree;
|
||||
typedef boost::shared_ptr<btree_layout> ptr;
|
||||
|
||||
virtual bool visit_internal(node_location const &loc,
|
||||
typename tree::internal_node const &n) {
|
||||
record_node(false, loc, n);
|
||||
return true;
|
||||
}
|
||||
|
||||
virtual bool visit_internal_leaf(node_location const &loc,
|
||||
typename tree::internal_node const &n) {
|
||||
record_node(true, loc, n);
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
virtual bool visit_leaf(node_location const &loc,
|
||||
typename tree::leaf_node const &n) {
|
||||
record_node(true, loc, n);
|
||||
return true;
|
||||
}
|
||||
|
||||
virtual void visit_complete() {
|
||||
}
|
||||
|
||||
vector<typename node_info::ptr> const &get_nodes() const {
|
||||
return nodes_;
|
||||
}
|
||||
|
||||
node_info const &random_node() const {
|
||||
if (nodes_.empty())
|
||||
throw runtime_error("no nodes in btree");
|
||||
|
||||
return *nodes_[::random() % nodes_.size()];
|
||||
}
|
||||
|
||||
private:
|
||||
// We rely on the visit order being depth first, lowest to highest.
|
||||
template <typename N>
|
||||
void record_node(bool leaf, node_location const &loc, N const &n) {
|
||||
typename node_info::ptr ni(new node_info);
|
||||
|
||||
ni->leaf = leaf;
|
||||
ni->depth = loc.depth;
|
||||
ni->level = loc.level;
|
||||
ni->b = n.get_location();
|
||||
|
||||
if (n.get_nr_entries())
|
||||
ni->keys = range<uint64_t>(n.key_at(0));
|
||||
else {
|
||||
if (loc.key)
|
||||
ni->keys = range<uint64_t>(*loc.key);
|
||||
else
|
||||
ni->keys = range<uint64_t>();
|
||||
}
|
||||
|
||||
if (last_node_at_depth_.size() > loc.depth) {
|
||||
typename node_info::ptr &last = last_node_at_depth_[loc.depth];
|
||||
|
||||
last->keys.end_ = ni->keys.begin_;
|
||||
last_node_at_depth_[loc.depth] = ni;
|
||||
} else
|
||||
last_node_at_depth_.push_back(ni);
|
||||
|
||||
nodes_.push_back(ni);
|
||||
}
|
||||
|
||||
vector<typename node_info::ptr> nodes_;
|
||||
vector<typename node_info::ptr> last_node_at_depth_;
|
||||
};
|
||||
|
||||
class value_visitor_mock {
|
||||
public:
|
||||
MOCK_METHOD1(visit, void(thing const &));
|
||||
@ -90,7 +175,7 @@ namespace {
|
||||
void insert_values(unsigned nr) {
|
||||
for (unsigned i = 0; i < nr; i++) {
|
||||
uint64_t key[1] = {i};
|
||||
thing value(i /*, i + 1234 */);
|
||||
thing value(i, i + 1234);
|
||||
|
||||
tree_->insert(key, value);
|
||||
}
|
||||
@ -100,13 +185,19 @@ namespace {
|
||||
EXPECT_CALL(value_visitor_, visit(_)).Times(0);
|
||||
}
|
||||
|
||||
void expect_value_range(uint64_t begin, uint64_t end) {
|
||||
while (begin < end) {
|
||||
EXPECT_CALL(value_visitor_, visit(Eq(thing(begin, begin + 1234)))).Times(1);
|
||||
begin++;
|
||||
}
|
||||
}
|
||||
|
||||
void expect_nr_values(unsigned nr) {
|
||||
for (unsigned i = 0; i < nr; i++)
|
||||
EXPECT_CALL(value_visitor_, visit(Eq(thing(i /*, i + 1234 */)))).Times(1);
|
||||
expect_value_range(0, nr);
|
||||
}
|
||||
|
||||
void expect_value(unsigned n) {
|
||||
EXPECT_CALL(value_visitor_, visit(Eq(thing(n /*, n + 1234 */)))).Times(1);
|
||||
EXPECT_CALL(value_visitor_, visit(Eq(thing(n, n + 1234)))).Times(1);
|
||||
}
|
||||
|
||||
void expect_no_damage() {
|
||||
@ -152,24 +243,62 @@ TEST_F(BTreeDamageVisitorTests, visiting_an_empty_tree)
|
||||
run();
|
||||
}
|
||||
|
||||
TEST_F(BTreeDamageVisitorTests, visiting_an_tree_with_a_trashed_root)
|
||||
TEST_F(BTreeDamageVisitorTests, visiting_a_tree_with_a_trashed_root)
|
||||
{
|
||||
trash_block(tree_->get_root());
|
||||
|
||||
expect_no_values();
|
||||
expect_damage(0, range<uint64_t>());
|
||||
expect_damage(0, range<uint64_t>(0ull));
|
||||
|
||||
run();
|
||||
}
|
||||
|
||||
TEST_F(BTreeDamageVisitorTests, visiting_a_populated_tree_with_no_damage)
|
||||
{
|
||||
insert_values(1000);
|
||||
insert_values(10000);
|
||||
|
||||
expect_nr_values(1000);
|
||||
expect_nr_values(10000);
|
||||
expect_no_damage();
|
||||
|
||||
run();
|
||||
}
|
||||
|
||||
TEST_F(BTreeDamageVisitorTests, visiting_a_populated_tree_with_a_damaged_leaf_node)
|
||||
{
|
||||
insert_values(10000);
|
||||
commit();
|
||||
|
||||
btree_layout<1, thing_traits> layout;
|
||||
tree_->visit_depth_first(layout);
|
||||
|
||||
typedef typename btree_layout<1, thing_traits>::node_info node_info;
|
||||
vector<typename node_info::ptr> const &nodes = layout.get_nodes();
|
||||
|
||||
unsigned nr_leaf = 0;
|
||||
for (unsigned i = 0; i < nodes.size(); i++)
|
||||
if (nodes[i]->leaf)
|
||||
nr_leaf++;
|
||||
|
||||
unsigned target = random() % nr_leaf;
|
||||
unsigned i;
|
||||
for (i = 0; i < nodes.size(); i++)
|
||||
if (nodes[i]->leaf) {
|
||||
if (!target)
|
||||
break;
|
||||
else
|
||||
target--;
|
||||
}
|
||||
|
||||
typename node_info::ptr n = nodes[i];
|
||||
|
||||
trash_block(n->b);
|
||||
cerr << "trashed leaf node with keys " << n->keys << endl;
|
||||
|
||||
expect_value_range(0, *n->keys.begin_);
|
||||
expect_value_range(*n->keys.end_, 10000);
|
||||
expect_damage(0, n->keys);
|
||||
|
||||
run();
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------
|
||||
|
Loading…
Reference in New Issue
Block a user