Use 50% of available cpus by default instead

Author: worryg0d

core/src/main/java/com/instaclustr/esop/impl/AbstractOperationRequest.java

@@ -60,7 +60,7 @@ public abstract class AbstractOperationRequest extends OperationRequest {
     public AbstractOperationRequest() {
         // for picocli
         if (concurrentConnections == null)
-            concurrentConnections = Runtime.getRuntime().availableProcessors();
+            concurrentConnections = getDefaultConcurrentConnections();
     }
 
     public AbstractOperationRequest(final StorageLocation storageLocation,
@@ -75,7 +75,7 @@ public AbstractOperationRequest(final StorageLocation storageLocation,
         this.skipBucketVerification = skipBucketVerification;
         this.proxySettings = proxySettings;
         this.retry = retry == null ? new RetrySpec() : retry;
-        this.concurrentConnections = concurrentConnections == null ? Runtime.getRuntime().availableProcessors() : concurrentConnections;
+        this.concurrentConnections = concurrentConnections == null ? getDefaultConcurrentConnections() : concurrentConnections;
         this.kmsKeyId = kmsKeyId;
     }
 
@@ -98,4 +98,11 @@ public void validate(final Set<String> storageProviders) {
             throw new IllegalStateException(format("Available storage providers: %s", Arrays.toString(storageProviders.toArray())));
         }
     }
+
+    /**
+     * Get default number of concurrent connections based on 50% of available processors.
+     */
+    private static int getDefaultConcurrentConnections() {
+        return Runtime.getRuntime().availableProcessors() / 2;
+    }
 }