* config only if read-only engine is being used.
*/
if(this.voldemortConfig.getStorageConfigurations()
.contains(ReadOnlyStorageConfiguration.class.getName())) {
long rate = this.voldemortConfig.getReadOnlyFetcherMaxBytesPerSecond();
this.dynThrottleLimit = new DynamicThrottleLimit(rate);
} else
this.dynThrottleLimit = null;
// create the proxy put thread pool
this.proxyPutWorkerPool = Executors.newFixedThreadPool(config.getMaxProxyPutThreads(),