Exemplo n.º 1
0
 public Optional<MetricSet> getValues(String metricName, Interval interval) {
   Instant now = Clock.systemUTC().instant();
   Optional<RetentionLevel> accessLevel =
       environment.retentions().findAccessLevelForMetric(metricName);
   Optional<MetricSet> setWithHighestQoS = Optional.empty();
   double highestAvailableQoS = 0;
   if (!accessLevel.isPresent()) {
     return Optional.empty();
   }
   EvictionStrategy evictionStrategy = findEvictionStrategyForAccessLevel(accessLevel.get()).get();
   evictionStrategy.accessing(metricName);
   while (accessLevel.isPresent() && caches.containsKey(accessLevel.get().name())) {
     log.trace("Found accessLevel " + accessLevel.get().name());
     Optional<CachingLevel> cachingLevel =
         environment.cachingConfiguration().findLevelForLevelName(accessLevel.get().name());
     if (cachingLevel.isPresent()) {
       long cachingLevelStart =
           now.minusSeconds(cachingLevel.get().cacheLineWidth() * accessLevel.get().frequency())
               .getEpochSecond();
       if (cachingLevelStart < interval.start()) {
         Optional<MetricSet> metricSet = doGetValues(metricName, interval, cachingLevel.get());
         if (!metricSet.isPresent()) {
           try {
             createNewCacheLines(metricName).get();
           } catch (InterruptedException | ExecutionException e) {
             log.warn("Exception while waiting for threads loading metrics", e);
           }
           metricSet = doGetValues(metricName, interval, cachingLevel.get());
         }
         if (metricSet.isPresent()) {
           log.trace("metricSet contains {} timestamps", metricSet.get().size());
           log.trace("accesslevel: {} | metricSet: {}", accessLevel.get().name(), metricSet.get());
           OptionalDouble serviceAvailable = calculateQoS(interval, metricSet.get());
           if (serviceAvailable.isPresent()
               && serviceAvailable.getAsDouble()
                   >= environment.cachingConfiguration().qualityOfService()) {
             log.trace("returning metricSet");
             return metricSet;
           } else if (serviceAvailable.isPresent()
               && serviceAvailable.getAsDouble() > highestAvailableQoS) {
             log.trace("new highestAvailable set");
             highestAvailableQoS = serviceAvailable.getAsDouble();
             setWithHighestQoS = metricSet;
           }
         } else {
           log.debug(
               "no metricSet for cacheLevel {} metric {} found!",
               accessLevel.get().name(),
               metricName);
         }
       }
     }
     accessLevel = environment.retentions().getNextLevel(accessLevel.get());
   }
   log.trace("service requested not available, returning highest available");
   return setWithHighestQoS;
 }
Exemplo n.º 2
0
 @Override
 public void run() {
   Instant now = Clock.systemUTC().instant();
   Optional<RetentionLevel> accessLevel =
       environment.retentions().findAccessLevelForMetric(metricName);
   if (accessLevel.isPresent()) {
     if (caches.get(accessLevel.get().name()).containsMetric(metricName)) {
       return;
     }
     Optional<RetentionLevel> highestLevel = accessLevel;
     while (highestLevel.isPresent() && highestLevel.get().next() != null) {
       highestLevel = environment.retentions().getNextLevel(highestLevel.get());
     }
     Optional<CachingLevel> cachingLevel =
         environment.cachingConfiguration().findLevelForLevelName(highestLevel.get().name());
     if (cachingLevel.isPresent()) {
       List<Future<?>> futures = new ArrayList<>();
       ArrayList<Metric> databaseMetricsList = new ArrayList<>();
       long intervalStart =
           now.minusSeconds(cachingLevel.get().cacheLineWidth() * highestLevel.get().frequency())
               .getEpochSecond();
       Interval interval = new Interval(intervalStart, now.getEpochSecond());
       Stream<Metric> databaseMetrics =
           environment.cassandraAccessLayer().loadMetrics(metricName, interval);
       Iterator<Metric> databaseMetricsIterator = databaseMetrics.iterator();
       while (databaseMetricsIterator.hasNext()) {
         Metric m = databaseMetricsIterator.next();
         databaseMetricsList.add(m);
       }
       while (accessLevel.isPresent()) {
         LoadMetrics loadMetrics =
             new LoadMetrics(accessLevel.get(), metricName, databaseMetricsList, interval);
         futures.add(loadMetricsThreadPool.submit(Executors.callable(loadMetrics)));
         accessLevel = environment.retentions().getNextLevel(accessLevel.get());
       }
       for (Future<?> f : futures) {
         try {
           f.get();
         } catch (InterruptedException | ExecutionException e) {
           log.warn("Exception while waiting for insertion of metrics into cache", e);
         }
       }
     }
   }
   log.trace("all new cache lines created for metric {}", metricName);
 }