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Add writes_before_delete_range flag to db_bench (#4538)

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Summary:
The new flag allows tombstones to be generated after enough
keys have been written to the database, which makes it easier to ensure
that tombstones cover a lot of keys.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4538

Differential Revision: D10455685

Pulled By: abhimadan

fbshipit-source-id: f25d5421745a353c830dea12b79784e852056551
This commit is contained in:
Abhishek Madan 2018-10-18 17:16:36 -07:00 committed by Facebook Github Bot
parent 0afa5b53d7
commit 35cd754a6d
1 changed files with 12 additions and 4 deletions
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16
tools/db_bench_tool.cc
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@ -640,9 +640,11 @@ DEFINE_bool(optimize_filters_for_hits, false,
DEFINE_uint64(delete_obsolete_files_period_micros, 0,
"Ignored. Left here for backward compatibility");
DEFINE_int64(writes_before_delete_range, 0,
"Number of writes before DeleteRange is called regularly.");
DEFINE_int64(writes_per_range_tombstone, 0,
"Number of writes between range "
"tombstones");
"Number of writes between range tombstones");
DEFINE_int64(range_tombstone_width, 100, "Number of keys in tombstone's range");
@ -1968,6 +1970,7 @@ class Benchmark {
int prefix_size_;
int64_t keys_per_prefix_;
int64_t entries_per_batch_;
int64_t writes_before_delete_range_;
int64_t writes_per_range_tombstone_;
int64_t range_tombstone_width_;
int64_t max_num_range_tombstones_;
@ -2495,6 +2498,7 @@ void VerifyDBFromDB(std::string& truth_db_name) {
value_size_ = FLAGS_value_size;
key_size_ = FLAGS_key_size;
entries_per_batch_ = FLAGS_batch_size;
writes_before_delete_range_ = FLAGS_writes_before_delete_range;
writes_per_range_tombstone_ = FLAGS_writes_per_range_tombstone;
range_tombstone_width_ = FLAGS_range_tombstone_width;
max_num_range_tombstones_ = FLAGS_max_num_range_tombstones;
@ -3876,9 +3880,13 @@ void VerifyDBFromDB(std::string& truth_db_name) {
bytes += value_size_ + key_size_;
++num_written;
if (writes_per_range_tombstone_ > 0 &&
num_written / writes_per_range_tombstone_ <=
num_written > writes_before_delete_range_ &&
(num_written - writes_before_delete_range_) /
writes_per_range_tombstone_ <=
max_num_range_tombstones_ &&
num_written % writes_per_range_tombstone_ == 0) {
(num_written - writes_before_delete_range_) %
writes_per_range_tombstone_ ==
0) {
int64_t begin_num = key_gens[id]->Next();
if (FLAGS_expand_range_tombstones) {
for (int64_t offset = 0; offset < range_tombstone_width_;