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Support compaction filter in db_bench (#4106) 

Summary:
Right now there is no support for enabling compaction filter in db_bench, we should add support for that to facilitate testing of compaction filter.
This PR adds a compaction filter called KeepFilter and make `Filter` always returns false, essentially a noop compaction filter. This will allow us to test compaction filter code path without having to support arbitrary compaction filters
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4106

Differential Revision: D8828517

Pulled By: miasantreble

fbshipit-source-id: 9ad76d04103eaa9d00da98334b4a39e542d26c41
This commit is contained in:
Zhongyi Xie 2018-07-12 19:33:59 -07:00 committed by Facebook Github Bot
parent 97fe23fc5c
commit de98fd88e3
1 changed files with 20 additions and 0 deletions
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20
tools/db_bench_tool.cc
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@ -525,6 +525,9 @@ DEFINE_bool(read_cache_direct_write, true,
DEFINE_bool(read_cache_direct_read, true,
"Whether to use Direct IO for reading from read cache");
DEFINE_bool(use_keep_filter, false,
"Whether to use a noop compaction filter");
static bool ValidateCacheNumshardbits(const char* flagname, int32_t value) {
if (value >= 20) {
fprintf(stderr, "Invalid value for --%s: %d, must be < 20\n",
@ -2199,6 +2202,17 @@ class Benchmark {
std::shared_ptr<TimestampEmulator> timestamp_emulator_;
};
class KeepFilter : public CompactionFilter {
public:
virtual bool Filter(int /*level*/, const Slice& /*key*/,
const Slice& /*value*/, std::string* /*new_value*/,
bool* /*value_changed*/) const override {
return false;
}
virtual const char* Name() const override { return "KeepFilter"; }
};
std::shared_ptr<Cache> NewCache(int64_t capacity) {
if (capacity <= 0) {
return nullptr;
@ -3427,6 +3441,12 @@ void VerifyDBFromDB(std::string& truth_db_name) {
}
options.wal_dir = wal_dir;
}
// KeepFilter is a noop filter, this can be used to test compaction filter
if (FLAGS_use_keep_filter) {
options.compaction_filter = new KeepFilter();
fprintf(stdout, "A noop compaction filter is used\n");
}
}
void Open(Options* opts) {