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Option to expand range tombstones in db_bench

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Summary:
When enabled, this option replaces range tombstones with a sequence of
point tombstones covering the same range. This can be used to A/B test perf of
range tombstones vs sequential point tombstones, and help us find the cross-over
point, i.e., the size of the range above which range tombstones outperform point
tombstones.
Closes https://github.com/facebook/rocksdb/pull/1594

Differential Revision: D4246312

Pulled By: ajkr

fbshipit-source-id: 3b00b23
This commit is contained in:
Andrew Kryczka 2016-12-06 18:02:43 -08:00 committed by Facebook Github Bot
parent c26a4d8e8a
commit fa50fffaf5
1 changed files with 39 additions and 11 deletions
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50
tools/db_bench_tool.cc
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@ -545,6 +545,9 @@ DEFINE_int64(max_num_range_tombstones, 0,
"Maximum number of range tombstones "
"to insert.");
DEFINE_bool(expand_range_tombstones, false,
"Expand range tombstone into sequential regular tombstones.");
#ifndef ROCKSDB_LITE
DEFINE_bool(optimistic_transaction_db, false,
"Open a OptimisticTransactionDB instance. "
@ -3232,6 +3235,14 @@ class Benchmark {
Slice begin_key = AllocateKey(&begin_key_guard);
std::unique_ptr<const char[]> end_key_guard;
Slice end_key = AllocateKey(&end_key_guard);
std::vector<std::unique_ptr<const char[]>> expanded_key_guards;
std::vector<Slice> expanded_keys;
if (FLAGS_expand_range_tombstones) {
expanded_key_guards.resize(range_tombstone_width_);
for (auto& expanded_key_guard : expanded_key_guards) {
expanded_keys.emplace_back(AllocateKey(&expanded_key_guard));
}
}
int64_t stage = 0;
int64_t num_written = 0;
@ -3283,18 +3294,35 @@ class Benchmark {
max_num_range_tombstones_ &&
num_written % writes_per_range_tombstone_ == 0) {
int64_t begin_num = key_gens[id]->Next();
GenerateKeyFromInt(begin_num, FLAGS_num, &begin_key);
GenerateKeyFromInt(begin_num + range_tombstone_width_, FLAGS_num,
&end_key);
if (FLAGS_use_blob_db) {
s = db_with_cfh->db->DeleteRange(
write_options_, db_with_cfh->db->DefaultColumnFamily(),
begin_key, end_key);
} else if (FLAGS_num_column_families <= 1) {
batch.DeleteRange(begin_key, end_key);
if (FLAGS_expand_range_tombstones) {
for (int64_t offset = 0; offset < range_tombstone_width_;
++offset) {
GenerateKeyFromInt(begin_num + offset, FLAGS_num,
&expanded_keys[offset]);
if (FLAGS_use_blob_db) {
s = db_with_cfh->db->Delete(write_options_,
expanded_keys[offset]);
} else if (FLAGS_num_column_families <= 1) {
batch.Delete(expanded_keys[offset]);
} else {
batch.Delete(db_with_cfh->GetCfh(rand_num),
expanded_keys[offset]);
}
}
} else {
batch.DeleteRange(db_with_cfh->GetCfh(rand_num), begin_key,
end_key);
GenerateKeyFromInt(begin_num, FLAGS_num, &begin_key);
GenerateKeyFromInt(begin_num + range_tombstone_width_, FLAGS_num,
&end_key);
if (FLAGS_use_blob_db) {
s = db_with_cfh->db->DeleteRange(
write_options_, db_with_cfh->db->DefaultColumnFamily(),
begin_key, end_key);
} else if (FLAGS_num_column_families <= 1) {
batch.DeleteRange(begin_key, end_key);
} else {
batch.DeleteRange(db_with_cfh->GetCfh(rand_num), begin_key,
end_key);
}
}
}
}