tune default amqp prefetch count
diff --git a/metadata/service/server/amqp/router.yml b/metadata/service/server/amqp/router.yml
index d8a03b8..0a0b386 100644
--- a/metadata/service/server/amqp/router.yml
+++ b/metadata/service/server/amqp/router.yml
@@ -17,7 +17,7 @@
           exchange_type: fanout
           decoder: ProtoBufDecoder
           splitter: HekaFramingSplitter
-          prefetch_count: 20
+          prefetch_count: 200
         rsyslog_syslog:
           engine: logstreamer
           log_directory: /var/log