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Create BuildSteps race-free

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If multiple threads create a step for the same build, they could get
the same "max(stepnr)" and allocate conflicting new step numbers. So
lock the BuildSteps table while doing this. We could use a different
isolation level, but this is easier.
This commit is contained in:
Eelco Dolstra 2015-06-09 15:03:20 +02:00
parent 61d4060522
commit c93aa92563
1 changed files with 6 additions and 2 deletions
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8
src/hydra-queue-runner/hydra-queue-runner.cc
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@ -358,6 +358,10 @@ void State::clearBusy(time_t stopTime)
int State::createBuildStep(pqxx::work & txn, time_t startTime, Build::ptr build, Step::ptr step,
const std::string & machine, BuildStepStatus status, const std::string & errorMsg, BuildID propagatedFrom)
{
/* Acquire an exclusive lock on BuildSteps to ensure that we don't
race with other threads creating a step of the same build. */
txn.exec("lock table BuildSteps in exclusive mode");
auto res = txn.parameterized("select max(stepnr) from BuildSteps where build = $1")(build->id).exec();
int stepNr = res[0][0].is_null() ? 1 : res[0][0].as<int>() + 1;
@ -892,13 +896,13 @@ void State::doBuildStep(std::shared_ptr<StoreAPI> store, Step::ptr step,
} else {
/* Create failed build steps for every build that depends
on this. */
finishBuildStep(txn, result.startTime, result.stopTime, build->id, stepNr, machine->sshName, bssFailed, result.errorMsg);
for (auto build2 : dependents) {
if (build == build2) continue;
createBuildStep(txn, result.stopTime, build2, step, machine->sshName, bssFailed, result.errorMsg, build->id);
}
finishBuildStep(txn, result.startTime, result.stopTime, build->id, stepNr, machine->sshName, bssFailed, result.errorMsg);
/* Mark all builds that depend on this derivation as failed. */
for (auto build2 : dependents) {
printMsg(lvlError, format("marking build %1% as failed") % build2->id);