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Add counters for seek/next/prev

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Summary:
There are currently no statistics on seeks, only on gets. This adds the following counters:

rocksdb.number.db.seek
rocksdb.number.db.next
rocksdb.number.db.prev
(number of calls)

rocksdb.db.iterate.bytes.read
(number of bytes read from key + value using seek/next/prev)

rocksdb.number.keys.seek.found
rocksdb.number.keys.next.found
rocksdb.number.keys.prev.found
(number of calls where seek/next/prev found a value)

Test Plan:
./db_bench -statistics -benchmarks fillrandom,seekrandom -seek_nexts 5
./db_bench -statistics -benchmarks fillrandom,seekrandom -seek_nexts 5 -reverse_iterator

Reviewers: yhchiang, rven, kradhakrishnan, IslamAbdelRahman, MarkCallaghan, sdong, igor

Reviewed By: sdong

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D46605
This commit is contained in:
Manuel Ung 2015-09-11 11:37:44 -07:00
parent 45e9e4f0bb
commit aeb4612685
2 changed files with 53 additions and 0 deletions
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35
db/db_iter.cc
View file

@ -189,6 +189,13 @@ void DBIter::Next() {
return;
}
FindNextUserEntry(true /* skipping the current user key */);
if (statistics_ != nullptr) {
RecordTick(statistics_, NUMBER_DB_NEXT);
if (valid_) {
RecordTick(statistics_, NUMBER_DB_NEXT_FOUND);
RecordTick(statistics_, ITER_BYTES_READ, key().size() + value().size());
}
}
}
// PRE: saved_key_ has the current user key if skipping
@ -355,6 +362,13 @@ void DBIter::Prev() {
ReverseToBackward();
}
PrevInternal();
if (statistics_ != nullptr) {
RecordTick(statistics_, NUMBER_DB_PREV);
if (valid_) {
RecordTick(statistics_, NUMBER_DB_PREV_FOUND);
RecordTick(statistics_, ITER_BYTES_READ, key().size() + value().size());
}
}
}
void DBIter::ReverseToBackward() {
@ -637,10 +651,17 @@ void DBIter::Seek(const Slice& target) {
iter_->Seek(saved_key_.GetKey());
}
RecordTick(statistics_, NUMBER_DB_SEEK);
if (iter_->Valid()) {
direction_ = kForward;
ClearSavedValue();
FindNextUserEntry(false /* not skipping */);
if (statistics_ != nullptr) {
if (valid_) {
RecordTick(statistics_, NUMBER_DB_SEEK_FOUND);
RecordTick(statistics_, ITER_BYTES_READ, key().size() + value().size());
}
}
} else {
valid_ = false;
}
@ -660,8 +681,15 @@ void DBIter::SeekToFirst() {
iter_->SeekToFirst();
}
RecordTick(statistics_, NUMBER_DB_SEEK);
if (iter_->Valid()) {
FindNextUserEntry(false /* not skipping */);
if (statistics_ != nullptr) {
if (valid_) {
RecordTick(statistics_, NUMBER_DB_SEEK_FOUND);
RecordTick(statistics_, ITER_BYTES_READ, key().size() + value().size());
}
}
} else {
valid_ = false;
}
@ -703,6 +731,13 @@ void DBIter::SeekToLast() {
}
}
PrevInternal();
if (statistics_ != nullptr) {
RecordTick(statistics_, NUMBER_DB_SEEK);
if (valid_) {
RecordTick(statistics_, NUMBER_DB_SEEK_FOUND);
RecordTick(statistics_, ITER_BYTES_READ, key().size() + value().size());
}
}
}
Iterator* NewDBIterator(Env* env, const ImmutableCFOptions& ioptions,

18
include/rocksdb/statistics.h
View file

@ -82,6 +82,17 @@ enum Tickers : uint32_t {
// For the number of logical bytes read from DB::MultiGet(),
// please use NUMBER_MULTIGET_BYTES_READ.
BYTES_READ,
// The number of calls to seek/next/prev
NUMBER_DB_SEEK,
NUMBER_DB_NEXT,
NUMBER_DB_PREV,
// The number of calls to seek/next/prev that returned data
NUMBER_DB_SEEK_FOUND,
NUMBER_DB_NEXT_FOUND,
NUMBER_DB_PREV_FOUND,
// The number of uncompressed bytes read from an iterator.
// Includes size of key and value.
ITER_BYTES_READ,
NO_FILE_CLOSES,
NO_FILE_OPENS,
NO_FILE_ERRORS,
@ -180,6 +191,13 @@ const std::vector<std::pair<Tickers, std::string>> TickersNameMap = {
{NUMBER_KEYS_UPDATED, "rocksdb.number.keys.updated"},
{BYTES_WRITTEN, "rocksdb.bytes.written"},
{BYTES_READ, "rocksdb.bytes.read"},
{NUMBER_DB_SEEK, "rocksdb.number.db.seek"},
{NUMBER_DB_NEXT, "rocksdb.number.db.next"},
{NUMBER_DB_PREV, "rocksdb.number.db.prev"},
{NUMBER_DB_SEEK_FOUND, "rocksdb.number.db.seek.found"},
{NUMBER_DB_NEXT_FOUND, "rocksdb.number.db.next.found"},
{NUMBER_DB_PREV_FOUND, "rocksdb.number.db.prev.found"},
{ITER_BYTES_READ, "rocksdb.db.iter.bytes.read"},
{NO_FILE_CLOSES, "rocksdb.no.file.closes"},
{NO_FILE_OPENS, "rocksdb.no.file.opens"},
{NO_FILE_ERRORS, "rocksdb.no.file.errors"},