Skip empty batches

lib/fluent/plugin/out_kinesis_streams.rb

@@ -23,6 +23,7 @@ class KinesisStreamsOutput < BufferedOutput
     def write(chunk)
       records = convert_to_records(chunk)
       split_to_batches(records).each do |batch|
+        next unless batch.size > 0
         batch_request_with_retry(batch)
       end
       log.debug("Written #{records.size} records")

test/dummy_server.rb

@@ -216,19 +216,27 @@ def exceeded?(req, max_count, max_size)
   def put_records_boby(req)
     body = JSON.parse(req.body)
     failed_record_count = 0
-    records = body['Records'].map do |record|
-      if random_fail
-        failed_record_count += 1
-        {
-          "ErrorCode" => "ProvisionedThroughputExceededException",
-          "ErrorMessage" => "Rate exceeded for shard shardId-000000000001 in stream exampleStreamName under account 111111111111."
-        }
-      else
-        @accepted_records << {:stream_name => body['StreamName'], :record => record}
-        {
-          "SequenceNumber" => "49543463076548007577105092703039560359975228518395019266",
-          "ShardId" => "shardId-000000000000"
-        }
+    records = if body['Records'].empty?
+      @error_count += 1  
+      [{
+        "ErrorCode" => "ValidationException",
+        "ErrorMessage" => "1 validation error detected: Value '[]' at 'records' failed to satisfy constraint: Member must have length greater than or equal to 1"
+      }]
+    else
+      body['Records'].map do |record|
+        if random_fail
+          failed_record_count += 1
+          {
+            "ErrorCode" => "ProvisionedThroughputExceededException",
+            "ErrorMessage" => "Rate exceeded for shard shardId-000000000001 in stream exampleStreamName under account 111111111111."
+          }
+        else
+          @accepted_records << {:stream_name => body['StreamName'], :record => record}
+          {
+            "SequenceNumber" => "49543463076548007577105092703039560359975228518395019266",
+            "ShardId" => "shardId-000000000000"
+          }
+        end
       end
     end
     @failed_count += failed_record_count

test/plugin/test_out_kinesis_streams.rb

@@ -97,6 +97,15 @@ def test_max_record_size
     assert_equal 1, d.instance.log.logs.size
   end
 
+  def test_single_max_record_size
+    d = create_driver
+    d.emit({"a"=>"a"*(1024*1024-'{"a":""}'.size+1)}) # exceeded
+    d.run
+    assert_equal 0, @server.records.size
+    assert_equal 0, @server.error_count
+    assert_equal 1, d.instance.log.logs.size
+  end
+
   pad = 32 + '{"data":""}'.size
   data(
     'split_by_count'           => [Array.new(501, {data:'a'}),                                        [500,1]],