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Add metrics for read range. (#8692)

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Yao Xiao 2022-11-04 11:05:53 -07:00 committed by GitHub
parent 0ca344a917
commit 8de6793aa3
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1 changed files with 9 additions and 3 deletions
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12
fdbserver/KeyValueStoreShardedRocksDB.actor.cpp
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@ -2163,10 +2163,16 @@ struct ShardedRocksDBKeyValueStore : IKeyValueStore {
: keys(keys), rowLimit(rowLimit), byteLimit(byteLimit), startTime(timer_monotonic()),
getHistograms(
(deterministicRandom()->random01() < SERVER_KNOBS->ROCKSDB_HISTOGRAMS_SAMPLE_RATE) ? true : false) {
std::set<PhysicalShard*> usedShards;
for (const DataShard* shard : shards) {
if (shard != nullptr) {
shardRanges.emplace_back(shard->physicalShard, keys & shard->range);
}
ASSERT(shard);
shardRanges.emplace_back(shard->physicalShard, keys & shard->range);
usedShards.insert(shard->physicalShard);
}
if (usedShards.size() != shards.size()) {
TraceEvent("ReadRangeMetrics")
.detail("NumPhysicalShards", usedShards.size())
.detail("NumDataShards", shards.size());
}
}
double getTimeEstimate() const override { return SERVER_KNOBS->READ_RANGE_TIME_ESTIMATE; }