README.md in fluent-plugin-gcloud-pubsub-custom-1.0.2 vs README.md in fluent-plugin-gcloud-pubsub-custom-1.0.3

@@ -17,10 +17,14 @@
 - Create a project on Google Developer Console
 - Add a topic of Cloud Pub/Sub to the project
 - Add a pull style subscription to the topic
 - Download your credential (json) or [set scope on GCE instance](https://cloud.google.com/compute/docs/api/how-tos/authorization)
 
+When using output plugin, you need to grant Pub/Sub Publisher and Pub/Sub Viewer role to IAM.
+
+Also, when using input plugin, you need to grant Pub/Sub Subscriber and Pub/Sub Viewer role to IAM.
+
 ## Requirements
 
 | fluent-plugin-gcloud-pubsub-custom | fluentd | ruby |
 |------------------------|---------|------|
 | >= 1.0.0 | >= v0.14.0 | >= 2.1 |
@@ -54,15 +58,17 @@
   topic <YOUR TOPIC>
   autocreate_topic false
   max_messages 1000
   max_total_size 9800000
   max_message_size 4000000
-  buffer_type file
-  buffer_path /path/to/your/buffer
-  flush_interval 1s
-  try_flush_interval 0.1
-  format json
+  <buffer>
+    @type memory
+    flush_interval 1s
+  </buffer>
+  <format>
+    @type json
+  </format>
 </match>
 ```
 
 - `project` (optional)
   - Set your GCP project.
@@ -82,14 +88,10 @@
 - `max_total_size` (optional, default: `9800000` = `9.8MB`)
   - Publishing messages bytesize per request to Cloud Pub/Sub. This parameter affects only message size. You should specify a little smaller value than quota.
     - See https://cloud.google.com/pubsub/quotas#other_limits
 - `max_message_size` (optional, default: `4000000` = `4MB`)
   - Messages exceeding `max_message_size` are not published because Pub/Sub clients cannot receive it.
-- `buffer_type`, `buffer_path`, `flush_interval`, `try_flush_interval`
-  - These are fluentd buffer configuration. See http://docs.fluentd.org/articles/buffer-plugin-overview
-- `format` (optional, default: `json`)
-  - Set output format. See http://docs.fluentd.org/articles/out_file#format
 
 ### Pull messages
 
 Use `gcloud_pubsub` input plugin.
 
@@ -103,15 +105,17 @@
   subscription <YOUR SUBSCRIPTION>
   max_messages 1000
   return_immediately true
   pull_interval 0.5
   pull_threads 2
-  format json
   parse_error_action exception
   enable_rpc true
   rpc_bind 0.0.0.0
   rpc_port 24680
+  <parse>
+    @type json
+  </parse>
 </source>
 ```
 
 - `tag` (required)
   - Set tag of messages.
@@ -137,11 +141,9 @@
   - If `return_immediately` is `true` or pulling message is stopped by HTTP RPC, this plugin wait `pull_interval` each pull.
 - `pull_interval` (optional, default: `5.0`)
   - Pulling messages by intervals of specified seconds.
 - `pull_threads` (optional, default: `1`)
   - Set number of threads to pull messages.
-- `format` (optional, default: `json`)
-  - Set input format. See format section in http://docs.fluentd.org/articles/in_tail
 - `parse_error_action` (optional, default: `exception`)
   - Set error type when parsing messages fails.
     - `exception`: Raise exception. Messages are not acknowledged.
     - `warning`: Only logging as warning.
 - `enable_rpc` (optional, default: `false`)