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Add a statistic to count the number of calls to GetUpdatesSince

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Summary: This is useful to keep track of refreshes in transaction log iterator

Test Plan: make; db_stress --statistics=1 shows it

Reviewers: dhruba, haobo

Reviewed By: dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D13281
This commit is contained in:
Mayank Agarwal 2013-10-04 10:33:28 -07:00
parent 854d236361
commit b3ed08129b
2 changed files with 7 additions and 1 deletions
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1
db/db_impl.cc
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@ -1092,6 +1092,7 @@ SequenceNumber DBImpl::GetLatestSequenceNumber() {
Status DBImpl::GetUpdatesSince(SequenceNumber seq,
unique_ptr<TransactionLogIterator>* iter) {
RecordTick(options_.statistics, GET_UPDATES_SINCE_CALLS);
if (seq > last_flushed_sequence_) {
return Status::IOError("Requested sequence not yet written in the db");
}

7
include/rocksdb/statistics.h
View File

@ -76,6 +76,10 @@ enum Tickers {
// over large number of keys with same userkey.
NUMBER_OF_RESEEKS_IN_ITERATION,
// Record the number of calls to GetUpadtesSince. Useful to keep track of
// transaction log iterator refreshes
GET_UPDATES_SINCE_CALLS,
TICKER_ENUM_MAX
};
@ -108,7 +112,8 @@ const std::vector<std::pair<Tickers, std::string>> TickersNameMap = {
{ SEQUENCE_NUMBER, "rocksdb.sequence.number" },
{ BLOOM_FILTER_PREFIX_CHECKED, "rocksdb.bloom.filter.prefix.checked" },
{ BLOOM_FILTER_PREFIX_USEFUL, "rocksdb.bloom.filter.prefix.useful" },
{ NUMBER_OF_RESEEKS_IN_ITERATION, "rocksdb.number.reseeks.iteration" }
{ NUMBER_OF_RESEEKS_IN_ITERATION, "rocksdb.number.reseeks.iteration" },
{ GET_UPDATES_SINCE_CALLS, "rocksdb.getupdatessince.calls" }
};
/**