private Timer timer(String name) {
Timer timer = metricRegistry.getTimers().get(name);
if (timer != null) {
return timer;
}
try {
return metricRegistry.register(
name,
new Timer(new SlidingTimeWindowReservoir(timerReservoirSeconds.get(), TimeUnit.SECONDS)));
} catch (IllegalArgumentException e) {
// timer already exists. this happens due to race condition. its fine.
return metricRegistry.getTimers().get(name);
}
}
protected ScanResult dbScanWithThroughputBackOff(ScanRequest scanRequest) {
Long currentBackOffMs = minBackOffMs.get();
Long retryCount = 0L;
while (true) {
try {
return dbClient.scan(scanRequest);
} catch (ProvisionedThroughputExceededException e) {
currentBackOffMs = Math.min(currentBackOffMs * 2, maxBackOffMs.get());
log.error(
String.format(
"Failed to poll Dynamo due to ProvisionedThroughputExceededException. Backing off for %d ms.",
currentBackOffMs));
if (retryCount > maxRetryCount.get()) {
throw e;
}
retryCount++;
try {
Thread.sleep(currentBackOffMs);
} catch (InterruptedException ex) {
}
}
}
}