private synchronized void callOomKiller(Iterable<QueryExecution> runningQueries) { List<QueryMemoryInfo> queryMemoryInfoList = Streams.stream(runningQueries) .map(this::createQueryMemoryInfo) .collect(toImmutableList()); List<MemoryInfo> nodeMemoryInfos = nodes.values().stream() .map(RemoteNodeMemory::getInfo) .filter(Optional::isPresent) .map(Optional::get) .collect(toImmutableList()); Optional<QueryId> chosenQueryId = lowMemoryKiller.chooseQueryToKill(queryMemoryInfoList, nodeMemoryInfos); if (chosenQueryId.isPresent()) { log.debug("Low memory killer chose %s", chosenQueryId.get()); Optional<QueryExecution> chosenQuery = Streams.stream(runningQueries).filter(query -> chosenQueryId.get().equals(query.getQueryId())).collect(toOptional()); if (chosenQuery.isPresent()) { // See comments in isLastKilledQueryGone for why chosenQuery might be absent. chosenQuery.get().fail(new PrestoException(CLUSTER_OUT_OF_MEMORY, "Query killed because the cluster is out of memory. Please try again in a few minutes.")); queriesKilledDueToOutOfMemory.incrementAndGet(); lastKilledQuery = chosenQueryId.get(); logQueryKill(chosenQueryId.get(), nodeMemoryInfos); } } }
private synchronized void callOomKiller(Iterable<QueryExecution> runningQueries) { List<QueryMemoryInfo> queryMemoryInfoList = Streams.stream(runningQueries) .map(this::createQueryMemoryInfo) .collect(toImmutableList()); List<MemoryInfo> nodeMemoryInfos = nodes.values().stream() .map(RemoteNodeMemory::getInfo) .filter(Optional::isPresent) .map(Optional::get) .collect(toImmutableList()); Optional<QueryId> chosenQueryId = lowMemoryKiller.chooseQueryToKill(queryMemoryInfoList, nodeMemoryInfos); if (chosenQueryId.isPresent()) { log.debug("Low memory killer chose %s", chosenQueryId.get()); Optional<QueryExecution> chosenQuery = Streams.stream(runningQueries).filter(query -> chosenQueryId.get().equals(query.getQueryId())).collect(toOptional()); if (chosenQuery.isPresent()) { // See comments in isLastKilledQueryGone for why chosenQuery might be absent. chosenQuery.get().fail(new PrestoException(CLUSTER_OUT_OF_MEMORY, "Query killed because the cluster is out of memory. Please try again in a few minutes.")); queriesKilledDueToOutOfMemory.incrementAndGet(); lastKilledQuery = chosenQueryId.get(); logQueryKill(chosenQueryId.get(), nodeMemoryInfos); } } }