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Fix: the master proxy was too slow to erase a GRV budget deficit if no GRV requests were coming in.

This commit is contained in:
A.J. Beamon 2019-08-14 15:01:09 -07:00
parent b744c4b06e
commit 717ede25b3
1 changed files with 6 additions and 7 deletions
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13
fdbserver/MasterProxyServer.actor.cpp
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@ -128,7 +128,7 @@ ACTOR Future<Void> getRate(UID myID, Reference<AsyncVar<ServerDBInfo>> db, int64
when ( wait( leaseTimeout ) ) {
*outTransactionRate = 0;
*outBatchTransactionRate = 0;
//TraceEvent("MasterProxyRate", myID).detail("Rate", 0).detail("BatchRate", 0).detail("Lease", "Expired");
//TraceEvent("MasterProxyRate", myID).detail("Rate", 0.0).detail("BatchRate", 0.0).detail("Lease", "Expired");
leaseTimeout = Never();
}
}
@ -156,10 +156,7 @@ ACTOR Future<Void> queueTransactionStartRequests(
stats->txnBatchPriorityStartIn += req.transactionCount;
if (transactionQueue->empty()) {
if (now() - *lastGRVTime > *GRVBatchTime)
*lastGRVTime = now() - *GRVBatchTime;
forwardPromise(GRVTimer, delayJittered(*GRVBatchTime - (now() - *lastGRVTime), TaskPriority::ProxyGRVTimer));
forwardPromise(GRVTimer, delayJittered(std::max(0.0, *GRVBatchTime - (now() - *lastGRVTime)), TaskPriority::ProxyGRVTimer));
}
transactionQueue->push(std::make_pair(req, counter--));
@ -1108,7 +1105,9 @@ struct TransactionRateInfo {
TransactionRateInfo(double rate) : rate(rate), limit(0) {}
void reset(double elapsed) {
limit = std::min(0.0,limit) + std::min(rate * elapsed, SERVER_KNOBS->START_TRANSACTION_MAX_TRANSACTIONS_TO_START);
limit = std::min(0.0, limit) + rate * elapsed; // Adjust the limit based on the full elapsed interval in order to properly erase a deficit
limit = std::min(limit, rate * std::min(elapsed, SERVER_KNOBS->START_TRANSACTION_BATCH_INTERVAL_MAX)); // Don't allow the rate to exceed what would be allowed in the maximum batch interval
limit = std::min(limit, SERVER_KNOBS->START_TRANSACTION_MAX_TRANSACTIONS_TO_START);
}
bool canStart(int64_t numAlreadyStarted) {
@ -1170,7 +1169,7 @@ ACTOR static Future<Void> transactionStarter(
waitNext(GRVTimer.getFuture());
// Select zero or more transactions to start
double t = now();
double elapsed = std::min<double>(now() - lastGRVTime, SERVER_KNOBS->START_TRANSACTION_BATCH_INTERVAL_MAX);
double elapsed = now() - lastGRVTime;
lastGRVTime = t;
if(elapsed == 0) elapsed = 1e-15; // resolve a possible indeterminant multiplication with infinite transaction rate