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db_stress: improvements in TestIterator (#6166)

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Summary:
1. Cover SeekToFirst() and SeekToLast().
2. Try to record the history of iterator operations.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6166

Test Plan: Do some manual changes in the code to cover the failure cases and see the error printing is correct and SeekToFirst() and SeekToLast() sometimes show up.

Differential Revision: D19047079

fbshipit-source-id: 1ed616f919fe4d32c0a021fc37932a7bd3063bcd
main
sdong 5 years ago committed by Facebook Github Bot
parent e697da0b18
commit e55c2b3f0b
2 changed files with 88 additions and 44 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 120
      db_stress_tool/db_stress_test_base.cc
  2. 12
      db_stress_tool/db_stress_test_base.h

120
db_stress_tool/db_stress_test_base.cc
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@ -829,7 +829,15 @@ Status StressTest::TestIterate(ThreadState* thread,
}
}
std::string op_logs;
const size_t kOpLogsLimit = 10000;
for (const std::string& skey : key_str) {
if (op_logs.size() > kOpLogsLimit) {
// Shouldn't take too much memory for the history log. Clear it.
op_logs = "(cleared...)\n";
}
Slice key = skey;
if (readoptionscopy.iterate_upper_bound != nullptr &&
@ -840,6 +848,24 @@ Status StressTest::TestIterate(ThreadState* thread,
int64_t rand_upper_key = GenerateOneKey(thread, FLAGS_ops_per_thread);
upper_bound_str = Key(rand_upper_key);
upper_bound = Slice(upper_bound_str);
} else if (readoptionscopy.iterate_lower_bound != nullptr &&
thread->rand.OneIn(4)) {
// 1/4 chance, change the lower bound.
// It is possible that it is changed without first use, but there is no
// problem with that.
int64_t rand_lower_key = GenerateOneKey(thread, FLAGS_ops_per_thread);
lower_bound_str = Key(rand_lower_key);
lower_bound = Slice(lower_bound_str);
}
// Record some options to op_logs;
op_logs += "total_order_seek: ";
op_logs += (readoptionscopy.total_order_seek ? "1 " : "0 ");
if (readoptionscopy.iterate_upper_bound != nullptr) {
op_logs += "ub: " + upper_bound.ToString(true) + " ";
}
if (readoptionscopy.iterate_lower_bound != nullptr) {
op_logs += "lb: " + lower_bound.ToString(true) + " ";
}
// Set up an iterator and does the same without bounds and with total
@ -855,18 +881,34 @@ Status StressTest::TestIterate(ThreadState* thread,
std::unique_ptr<Iterator> cmp_iter(db_->NewIterator(cmp_ro, cmp_cfh));
bool diverged = false;
bool support_seek_first_or_last =
(options_.prefix_extractor.get() != nullptr) ||
readoptionscopy.total_order_seek;
LastIterateOp last_op;
if (thread->rand.OneIn(8)) {
if (support_seek_first_or_last && thread->rand.OneIn(100)) {
iter->SeekToFirst();
cmp_iter->SeekToFirst();
last_op = kLastOpSeekToFirst;
op_logs += "STF ";
} else if (support_seek_first_or_last && thread->rand.OneIn(100)) {
iter->SeekToLast();
cmp_iter->SeekToLast();
last_op = kLastOpSeekToLast;
op_logs += "STL ";
} else if (thread->rand.OneIn(8)) {
iter->SeekForPrev(key);
cmp_iter->SeekForPrev(key);
last_op = kLastOpSeekForPrev;
op_logs += "SFP " + key.ToString(true) + " ";
} else {
iter->Seek(key);
cmp_iter->Seek(key);
last_op = kLastOpSeek;
op_logs += "S " + key.ToString(true) + " ";
}
VerifyIterator(thread, cmp_cfh, readoptionscopy, iter.get(), cmp_iter.get(),
last_op, key, &diverged);
last_op, key, op_logs, &diverged);
bool no_reverse =
(FLAGS_memtablerep == "prefix_hash" && !read_opts.total_order_seek &&
@ -878,16 +920,18 @@ Status StressTest::TestIterate(ThreadState* thread,
assert(cmp_iter->Valid());
cmp_iter->Next();
}
op_logs += "N";
} else {
iter->Prev();
if (!diverged) {
assert(cmp_iter->Valid());
cmp_iter->Prev();
}
op_logs += "P";
}
last_op = kLastOpNextOrPrev;
VerifyIterator(thread, cmp_cfh, readoptionscopy, iter.get(),
cmp_iter.get(), last_op, key, &diverged);
cmp_iter.get(), last_op, key, op_logs, &diverged);
}
if (s.ok()) {
@ -896,6 +940,8 @@ Status StressTest::TestIterate(ThreadState* thread,
thread->stats.AddErrors(1);
break;
}
op_logs += "; ";
}
db_->ReleaseSnapshot(snapshot);
@ -939,27 +985,36 @@ void StressTest::VerifyIterator(ThreadState* thread,
ColumnFamilyHandle* cmp_cfh,
const ReadOptions& ro, Iterator* iter,
Iterator* cmp_iter, LastIterateOp op,
const Slice& seek_key, bool* diverged) {
const Slice& seek_key,
const std::string& op_logs, bool* diverged) {
if (*diverged) {
return;
}
if (op == kLastOpSeek && ro.iterate_lower_bound != nullptr &&
(options_.comparator->Compare(*ro.iterate_lower_bound, seek_key) >= 0 ||
(ro.iterate_upper_bound != nullptr &&
options_.comparator->Compare(*ro.iterate_lower_bound,
*ro.iterate_upper_bound) >= 0))) {
if (op == kLastOpSeekToFirst && ro.iterate_lower_bound != nullptr) {
// SeekToFirst() with lower bound is not well defined.
*diverged = true;
return;
} else if (op == kLastOpSeekToLast && ro.iterate_upper_bound != nullptr) {
// SeekToLast() with higher bound is not well defined.
*diverged = true;
return;
} else if (op == kLastOpSeek && ro.iterate_lower_bound != nullptr &&
(options_.comparator->Compare(*ro.iterate_lower_bound, seek_key) >=
0 ||
(ro.iterate_upper_bound != nullptr &&
options_.comparator->Compare(*ro.iterate_lower_bound,
*ro.iterate_upper_bound) >= 0))) {
// Lower bound behavior is not well defined if it is larger than
// seek key or upper bound. Disable the check for now.
*diverged = true;
return;
}
if (op == kLastOpSeekForPrev && ro.iterate_upper_bound != nullptr &&
(options_.comparator->Compare(*ro.iterate_upper_bound, seek_key) <= 0 ||
(ro.iterate_lower_bound != nullptr &&
options_.comparator->Compare(*ro.iterate_lower_bound,
*ro.iterate_upper_bound) >= 0))) {
} else if (op == kLastOpSeekForPrev && ro.iterate_upper_bound != nullptr &&
(options_.comparator->Compare(*ro.iterate_upper_bound, seek_key) <=
0 ||
(ro.iterate_lower_bound != nullptr &&
options_.comparator->Compare(*ro.iterate_lower_bound,
*ro.iterate_upper_bound) >= 0))) {
// Uppder bound behavior is not well defined if it is smaller than
// seek key or lower bound. Disable the check for now.
*diverged = true;
@ -968,18 +1023,9 @@ void StressTest::VerifyIterator(ThreadState* thread,
if (iter->Valid() && !cmp_iter->Valid()) {
fprintf(stderr,
"Control interator is invalid but iterator has key %s seek key "
"Control interator is invalid but iterator has key %s "
"%s\n",
iter->key().ToString(true).c_str(),
seek_key.ToString(true).c_str());
if (ro.iterate_upper_bound != nullptr) {
fprintf(stderr, "upper bound %s\n",
ro.iterate_upper_bound->ToString(true).c_str());
}
if (ro.iterate_lower_bound != nullptr) {
fprintf(stderr, "lower bound %s\n",
ro.iterate_lower_bound->ToString(true).c_str());
}
iter->key().ToString(true).c_str(), op_logs.c_str());
*diverged = true;
} else if (cmp_iter->Valid()) {
@ -1009,11 +1055,10 @@ void StressTest::VerifyIterator(ThreadState* thread,
return;
}
fprintf(stderr,
"Iterator stays in prefix bug contol doesn't"
" seek key %s iterator key %s control iterator key %s\n",
seek_key.ToString(true).c_str(),
"Iterator stays in prefix but contol doesn't"
" iterator key %s control iterator key %s %s\n",
iter->key().ToString(true).c_str(),
cmp_iter->key().ToString(true).c_str());
cmp_iter->key().ToString(true).c_str(), op_logs.c_str());
}
}
// Check upper or lower bounds.
@ -1026,23 +1071,14 @@ void StressTest::VerifyIterator(ThreadState* thread,
cmp->Compare(total_order_key, *ro.iterate_lower_bound) > 0))) {
fprintf(stderr,
"Iterator diverged from control iterator which"
" has value %s seek key %s\n",
total_order_key.ToString(true).c_str(),
seek_key.ToString(true).c_str());
" has value %s %s\n",
total_order_key.ToString(true).c_str(), op_logs.c_str());
if (iter->Valid()) {
fprintf(stderr, "iterator has value %s\n",
iter->key().ToString(true).c_str());
} else {
fprintf(stderr, "iterator is not valid\n");
}
if (ro.iterate_upper_bound != nullptr) {
fprintf(stderr, "upper bound %s\n",
ro.iterate_upper_bound->ToString(true).c_str());
}
if (ro.iterate_lower_bound != nullptr) {
fprintf(stderr, "lower bound %s\n",
ro.iterate_lower_bound->ToString(true).c_str());
}
*diverged = true;
}
}

12
db_stress_tool/db_stress_test_base.h
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@ -143,7 +143,13 @@ class StressTest {
const std::vector<int64_t>& rand_keys);
// Enum used by VerifyIterator() to identify the mode to validate.
enum LastIterateOp { kLastOpSeek, kLastOpSeekForPrev, kLastOpNextOrPrev };
enum LastIterateOp {
kLastOpSeek,
kLastOpSeekForPrev,
kLastOpNextOrPrev,
kLastOpSeekToFirst,
kLastOpSeekToLast
};
// Compare the two iterator, iter and cmp_iter are in the same position,
// unless iter might be made invalidate or undefined because of
@ -151,9 +157,11 @@ class StressTest {
// Will flag failure if the verification fails.
// diverged = true if the two iterator is already diverged.
// True if verification passed, false if not.
// op_logs is the information to print when validation fails.
void VerifyIterator(ThreadState* thread, ColumnFamilyHandle* cmp_cfh,
const ReadOptions& ro, Iterator* iter, Iterator* cmp_iter,
LastIterateOp op, const Slice& seek_key, bool* diverged);
LastIterateOp op, const Slice& seek_key,
const std::string& op_logs, bool* diverged);
virtual Status TestBackupRestore(ThreadState* thread,
const std::vector<int>& rand_column_families,

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