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db_stress rolling active window

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Summary:
Support a window of `active_width` keys that rolls through `[0, max_key)` over the duration of the test. Operations only affect keys inside the window. This gives us the ability to detect L0->L0 deletion bug (#2722).
Closes https://github.com/facebook/rocksdb/pull/2739

Differential Revision: D5628555

Pulled By: ajkr

fbshipit-source-id: 9cb2d8f4ab1a7c73f7797b8e19f7094970ea8749
This commit is contained in:
Andrew Kryczka 2017-08-15 11:53:00 -07:00 committed by Facebook Github Bot
parent dfa6c23c4b
commit 7aa96db7a2
1 changed files with 18 additions and 1 deletions
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19
tools/db_stress.cc
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@ -93,6 +93,13 @@ DEFINE_int64(max_key, 1 * KB* KB,
DEFINE_int32(column_families, 10, "Number of column families");
DEFINE_int64(
active_width, 0,
"Number of keys in active span of the key-range at any given time. The "
"span begins with its left endpoint at key 0, gradually moves rightwards, "
"and ends with its right endpoint at max_key. If set to 0, active_width "
"will be sanitized to be equal to max_key.");
// TODO(noetzli) Add support for single deletes
DEFINE_bool(test_batches_snapshots, false,
"If set, the test uses MultiGet(), MultiPut() and MultiDelete()"
@ -1727,7 +1734,11 @@ class StressTest {
}
#endif // !ROCKSDB_LITE
long rand_key = thread->rand.Next() % max_key;
const double completed_ratio =
static_cast<double>(i) / FLAGS_ops_per_thread;
const int64_t base_key = static_cast<int64_t>(
completed_ratio * (FLAGS_max_key - FLAGS_active_width));
long rand_key = base_key + thread->rand.Next() % FLAGS_active_width;
int rand_column_family = thread->rand.Next() % FLAGS_column_families;
std::string keystr = Key(rand_key);
Slice key = keystr;
@ -2433,6 +2444,12 @@ int main(int argc, char** argv) {
"test_batches_snapshots mode\n");
exit(1);
}
if (FLAGS_active_width > FLAGS_max_key) {
fprintf(stderr, "Error: active_width can be at most max_key\n");
exit(1);
} else if (FLAGS_active_width == 0) {
FLAGS_active_width = FLAGS_max_key;
}
// Choose a location for the test database if none given with --db=<path>
if (FLAGS_db.empty()) {