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Merge pull request #3152 from ajbeamon/tag-throttling-status-improvements 

Add and fix tag throttling status fields
This commit is contained in:
A.J. Beamon 2020-05-14 16:08:05 -07:00 committed by GitHub
parent b9fea57bd3 d0c66d7282
commit 3ee4912312
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 96 additions and 29 deletions
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17
documentation/sphinx/source/mr-status-json-schemas.rst.inc
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@ -121,6 +121,13 @@
},
"commit_latency_bands":{
"$map_key=upperBoundOfBand": 1
},
"busiest_read_tag":{
"tag": "",
"fractional_cost": 0.0,
"estimated_cost":{
"hz":0.0
}
}
}
],
@ -267,8 +274,14 @@
"transactions_per_second_limit":0,
"batch_released_transactions_per_second":0,
"released_transactions_per_second":0,
"batch_tags_throttled":0,
"tags_throttled":0,
"throttled_tags":{
"auto":{
"count":0
},
"manual":{
"count":0
}
},
"limiting_queue_bytes_storage_server":0,
"worst_queue_bytes_storage_server":0,
"limiting_version_lag_storage_server":0,

6
fdbclient/NativeAPI.actor.cpp
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@ -683,6 +683,10 @@ DatabaseContext::DatabaseContext(Reference<AsyncVar<Reference<ClusterConnectionF
}));
}
throttleExpirer = recurring([this](){ expireThrottles(); }, CLIENT_KNOBS->TAG_THROTTLE_EXPIRATION_INTERVAL);
if(BUGGIFY) {
DatabaseContext::debugUseTags = true;
}
}
DatabaseContext::DatabaseContext( const Error &err ) : deferredError(err), cc("TransactionMetrics"), transactionReadVersions("ReadVersions", cc), transactionReadVersionsThrottled("ReadVersionsThrottled", cc),
@ -2248,7 +2252,7 @@ Future<Standalone<RangeResultRef>> getRange( Database const& cx, Future<Version>
return getRange(cx, Reference<TransactionLogInfo>(), fVersion, begin, end, limits, Promise<std::pair<Key, Key>>(), true, reverse, info, tags);
}
bool DatabaseContext::debugUseTags = true;
bool DatabaseContext::debugUseTags = false;
const std::vector<std::string> DatabaseContext::debugTransactionTagChoices = { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t" };
void debugAddTags(Transaction *tr) {

17
fdbclient/Schemas.cpp
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@ -144,6 +144,13 @@ const KeyRef JSONSchemas::statusSchema = LiteralStringRef(R"statusSchema(
},
"commit_latency_bands":{
"$map": 1
},
"busiest_read_tag":{
"tag": "",
"fractional_cost": 0.0,
"estimated_cost":{
"hz": 0.0
}
}
}
],
@ -295,8 +302,14 @@ const KeyRef JSONSchemas::statusSchema = LiteralStringRef(R"statusSchema(
"transactions_per_second_limit":0,
"batch_released_transactions_per_second":0,
"released_transactions_per_second":0,
"batch_tags_throttled":0,
"tags_throttled":0,
"throttled_tags":{
"auto":{
"count":0
},
"manual":{
"count":0
}
},
"limiting_queue_bytes_storage_server":0,
"worst_queue_bytes_storage_server":0,
"limiting_version_lag_storage_server":0,

7
fdbserver/Ratekeeper.actor.cpp
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@ -439,7 +439,12 @@ public:
}
int64_t manualThrottleCount() const {
return autoThrottledTags.size();
int64_t count = 0;
for(auto itr = manualThrottledTags.begin(); itr != manualThrottledTags.end(); ++itr) {
count += itr->second.size();
}
return count;
}
TransactionTagMap<RkTagThrottleData> autoThrottledTags;

42
fdbserver/Status.actor.cpp
View File

@ -467,6 +467,29 @@ struct RolesInfo {
obj["data_lag"] = getLagObject(versionLag);
obj["durability_lag"] = getLagObject(version - durableVersion);
TraceEventFields const& busiestReadTag = metrics.at("BusiestReadTag");
if(busiestReadTag.size()) {
int64_t tagCost = busiestReadTag.getInt64("TagCost");
if(tagCost > 0) {
JsonBuilderObject busiestReadTagObj;
int64_t totalSampledCost = busiestReadTag.getInt64("TotalSampledCost");
ASSERT(totalSampledCost > 0);
busiestReadTagObj["tag"] = busiestReadTag.getValue("Tag");
busiestReadTagObj["fractional_cost"] = (double)tagCost / totalSampledCost;
double elapsed = busiestReadTag.getDouble("Elapsed");
if(CLIENT_KNOBS->READ_TAG_SAMPLE_RATE > 0 && elapsed > 0) {
JsonBuilderObject estimatedCostObj;
estimatedCostObj["hz"] = tagCost / CLIENT_KNOBS->READ_TAG_SAMPLE_RATE / elapsed;
busiestReadTagObj["estimated_cost"] = estimatedCostObj;
}
obj["busiest_read_tag"] = busiestReadTagObj;
}
}
} catch (Error& e) {
if(e.code() != error_code_attribute_not_found)
throw e;
@ -1526,7 +1549,7 @@ static Future<vector<std::pair<iface, EventMap>>> getServerMetrics(vector<iface>
ACTOR static Future<vector<std::pair<StorageServerInterface, EventMap>>> getStorageServersAndMetrics(Database cx, std::unordered_map<NetworkAddress, WorkerInterface> address_workers) {
vector<StorageServerInterface> servers = wait(timeoutError(getStorageServers(cx, true), 5.0));
vector<std::pair<StorageServerInterface, EventMap>> results = wait(
getServerMetrics(servers, address_workers, std::vector<std::string>{ "StorageMetrics", "ReadLatencyMetrics" }));
getServerMetrics(servers, address_workers, std::vector<std::string>{ "StorageMetrics", "ReadLatencyMetrics", "BusiestReadTag" }));
return results;
}
@ -1689,8 +1712,8 @@ ACTOR static Future<JsonBuilderObject> workloadStatusFetcher(Reference<AsyncVar<
double batchTpsLimit = batchRatekeeper.getDouble("TPSLimit");
double transPerSec = ratekeeper.getDouble("ReleasedTPS");
double batchTransPerSec = ratekeeper.getDouble("ReleasedBatchTPS");
int throttledTags = ratekeeper.getInt("TagsThrottled");
int batchThrottledTags = batchRatekeeper.getInt("TagsThrottled");
int autoThrottledTags = ratekeeper.getInt("TagsAutoThrottled");
int manualThrottledTags = ratekeeper.getInt("TagsManuallyThrottled");
int ssCount = ratekeeper.getInt("StorageServers");
int tlogCount = ratekeeper.getInt("TLogs");
int64_t worstFreeSpaceStorageServer = ratekeeper.getInt64("WorstFreeSpaceStorageServer");
@ -1721,8 +1744,17 @@ ACTOR static Future<JsonBuilderObject> workloadStatusFetcher(Reference<AsyncVar<
(*qos)["batch_transactions_per_second_limit"] = batchTpsLimit;
(*qos)["released_transactions_per_second"] = transPerSec;
(*qos)["batch_released_transactions_per_second"] = batchTransPerSec;
(*qos)["tags_throttled"] = throttledTags;
(*qos)["batch_tags_throttled"] = batchThrottledTags;
JsonBuilderObject throttledTagsObj;
JsonBuilderObject autoThrottledTagsObj;
autoThrottledTagsObj["count"] = autoThrottledTags;
throttledTagsObj["auto"] = autoThrottledTagsObj;
JsonBuilderObject manualThrottledTagsObj;
manualThrottledTagsObj["count"] = manualThrottledTags;
throttledTagsObj["manual"] = manualThrottledTagsObj;
(*qos)["throttled_tags"] = throttledTagsObj;
JsonBuilderObject perfLimit = getPerfLimit(ratekeeper, transPerSec, tpsLimit);
if(!perfLimit.empty()) {

26
fdbserver/storageserver.actor.cpp
View File

@ -453,12 +453,11 @@ public:
struct TransactionTagCounter {
struct TagInfo {
TransactionTag tag;
int64_t count;
double rate;
double fractionalBusyness;
double elapsed;
TagInfo(TransactionTag const& tag, int64_t count, int64_t totalCount, double elapsed)
: tag(tag), count(count), fractionalBusyness((double)count/totalCount), elapsed(elapsed) {}
TagInfo(TransactionTag const& tag, double rate, double fractionalBusyness)
: tag(tag), rate(rate), fractionalBusyness(fractionalBusyness) {}
};
TransactionTagMap<int64_t> intervalCounts;
@ -492,20 +491,21 @@ public:
void startNewInterval(UID id) {
double elapsed = now() - intervalStart;
if(intervalStart > 0 && busiestTagCount >= SERVER_KNOBS->MIN_TAG_PAGES_READ_RATE * elapsed) {
previousBusiestTag = TagInfo(busiestTag, busiestTagCount, intervalTotalSampledCount, elapsed);
}
else {
previousBusiestTag.reset();
if (intervalStart > 0 && CLIENT_KNOBS->READ_TAG_SAMPLE_RATE > 0 && elapsed > 0) {
double rate = busiestTagCount / CLIENT_KNOBS->READ_TAG_SAMPLE_RATE / elapsed;
if(rate > SERVER_KNOBS->MIN_TAG_PAGES_READ_RATE) {
previousBusiestTag = TagInfo(busiestTag, rate, (double)busiestTagCount / intervalTotalSampledCount);
}
// TODO: report in status
TraceEvent("BusiestReadTag", id)
.detail("Elapsed", elapsed)
.detail("Tag", printable(busiestTag))
.detail("TagCount", busiestTagCount)
.detail("TotalSampledCount", intervalTotalSampledCount)
.detail("Reported", previousBusiestTag.present());
.detail("TagCost", busiestTagCount)
.detail("TotalSampledCost", intervalTotalSampledCount)
.detail("Reported", previousBusiestTag.present())
.trackLatest(id.toString() + "/BusiestReadTag");
}
intervalCounts.clear();
intervalTotalSampledCount = 0;
@ -1655,7 +1655,7 @@ void getQueuingMetrics( StorageServer* self, StorageQueuingMetricsRequest const&
Optional<StorageServer::TransactionTagCounter::TagInfo> busiestTag = self->transactionTagCounter.getBusiestTag();
reply.busiestTag = busiestTag.map<TransactionTag>([](StorageServer::TransactionTagCounter::TagInfo tagInfo) { return tagInfo.tag; });
reply.busiestTagFractionalBusyness = busiestTag.present() ? busiestTag.get().fractionalBusyness : 0.0;
reply.busiestTagRate = busiestTag.present() ? busiestTag.get().count / busiestTag.get().elapsed : 0.0;
reply.busiestTagRate = busiestTag.present() ? busiestTag.get().rate : 0.0;
req.reply.send( reply );
}