Add ability to customize bulk batch size

lib/logstash/outputs/elasticsearch.rb

@@ -75,12 +75,12 @@
 #
 # ==== HTTP Compression
 #
-# This plugin supports request and response compression. Response compression is enabled by default and 
-# for Elasticsearch versions 5.0 and later, the user doesn't have to set any configs in Elasticsearch for 
-# it to send back compressed response. For versions before 5.0, `http.compression` must be set to `true` in 
+# This plugin supports request and response compression. Response compression is enabled by default and
+# for Elasticsearch versions 5.0 and later, the user doesn't have to set any configs in Elasticsearch for
+# it to send back compressed response. For versions before 5.0, `http.compression` must be set to `true` in
 # Elasticsearch[https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-http.html#modules-http] to take advantage of response compression when using this plugin
 #
-# For requests compression, regardless of the Elasticsearch version, users have to enable `http_compression` 
+# For requests compression, regardless of the Elasticsearch version, users have to enable `http_compression`
 # setting in their Logstash config file.
 #
 class LogStash::Outputs::ElasticSearch < LogStash::Outputs::Base
@@ -103,6 +103,8 @@ class LogStash::Outputs::ElasticSearch < LogStash::Outputs::Base
 
   config_name "elasticsearch"
 
+  DEFAULT_BATCH_SIZE = 20 * 1024 * 1024 # 20MiB
+
   # The Elasticsearch action to perform. Valid actions are:
   #
   # - index: indexes a document (an event from Logstash).
@@ -242,6 +244,19 @@ class LogStash::Outputs::ElasticSearch < LogStash::Outputs::Base
   # Custom Headers to send on each request to elasticsearch nodes
   config :custom_headers, :validate => :hash, :default => {}
 
+  # Bulk batch size is used to determine at what point to send the bulk requests.
+  # The criteria used for default value is:
+  # 1. We need a number that's less than 100MiB because ES
+  #    won't accept bulks larger than that.
+  # 2. It must be large enough to amortize the connection constant
+  #    across multiple requests.
+  # 3. It must be small enough that even if multiple threads hit this size
+  #    we won't use a lot of heap.
+  #
+  # We wound up agreeing that a number greater than 10 MiB and less than 100MiB
+  # made sense. We picked one on the lowish side to not use too much heap.
+  config :bulk_batch_size, :validate => :number, :default => DEFAULT_BATCH_SIZE
+
   # @override to handle proxy => '' as if none was set
   def config_init(params)
     proxy = params['proxy']

lib/logstash/outputs/elasticsearch/common_configs.rb

@@ -19,8 +19,8 @@ def self.included(mod)
       # Joda formats are defined http://www.joda.org/joda-time/apidocs/org/joda/time/format/DateTimeFormat.html[here].
       mod.config :index, :validate => :string, :default => DEFAULT_INDEX_NAME
 
-      mod.config :document_type, 
-        :validate => :string, 
+      mod.config :document_type,
+        :validate => :string,
         :deprecated => "Document types are being deprecated in Elasticsearch 6.0, and removed entirely in 7.0. You should avoid this feature"
 
       # From Logstash 1.3 onwards, a template is applied to Elasticsearch during
@@ -69,7 +69,7 @@ def self.included(mod)
       # The version to use for indexing. Use sprintf syntax like `%{my_version}` to use a field value here.
       # See https://www.elastic.co/blog/elasticsearch-versioning-support.
       mod.config :version, :validate => :string
-      
+
       # The version_type to use for indexing.
       # See https://www.elastic.co/blog/elasticsearch-versioning-support.
       # See also https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-index_.html#_version_types
@@ -145,7 +145,6 @@ def self.included(mod)
       # here like `pipeline => "%{INGEST_PIPELINE}"`
       mod.config :pipeline, :validate => :string, :default => nil
 
-
       # -----
       # ILM configurations (beta)
       # -----

lib/logstash/outputs/elasticsearch/http_client.rb

@@ -8,21 +8,6 @@
 require 'stringio'
 
 module LogStash; module Outputs; class ElasticSearch;
-  # This is a constant instead of a config option because
-  # there really isn't a good reason to configure it.
-  #
-  # The criteria used are:
-  # 1. We need a number that's less than 100MiB because ES
-  #    won't accept bulks larger than that.
-  # 2. It must be large enough to amortize the connection constant
-  #    across multiple requests.
-  # 3. It must be small enough that even if multiple threads hit this size
-  #    we won't use a lot of heap.
-  #
-  # We wound up agreeing that a number greater than 10 MiB and less than 100MiB
-  # made sense. We picked one on the lowish side to not use too much heap.
-  TARGET_BULK_BYTES = 20 * 1024 * 1024 # 20MiB
-
   class HttpClient
     attr_reader :client, :options, :logger, :pool, :action_count, :recv_count
     # This is here in case we use DEFAULT_OPTIONS in the future
@@ -52,6 +37,7 @@ class HttpClient
     def initialize(options={})
       @logger = options[:logger]
       @metric = options[:metric]
+      @bulk_batch_size = options[:bulk_batch_size]
       @bulk_request_metrics = @metric.namespace(:bulk_requests)
       @bulk_response_metrics = @bulk_request_metrics.namespace(:responses)
 
@@ -110,7 +96,7 @@ def bulk(actions)
       if http_compression
         body_stream.set_encoding "BINARY"
         stream_writer = Zlib::GzipWriter.new(body_stream, Zlib::DEFAULT_COMPRESSION, Zlib::DEFAULT_STRATEGY)
-      else 
+      else
         stream_writer = body_stream
       end
       bulk_responses = []
@@ -119,7 +105,7 @@ def bulk(actions)
                     action.map {|line| LogStash::Json.dump(line)}.join("\n") :
                     LogStash::Json.dump(action)
         as_json << "\n"
-        if (body_stream.size + as_json.bytesize) > TARGET_BULK_BYTES
+        if (body_stream.size + as_json.bytesize) > @bulk_batch_size
           bulk_responses << bulk_send(body_stream) unless body_stream.size == 0
         end
         stream_writer.write(as_json)
@@ -215,7 +201,7 @@ def scheme
                         else
                           nil
                         end
-      
+
       calculated_scheme = calculate_property(uris, :scheme, explicit_scheme, sniffing)
 
       if calculated_scheme && calculated_scheme !~ /https?/
@@ -235,7 +221,7 @@ def port
       # Enter things like foo:123, bar and wind up with foo:123, bar:9200
       calculate_property(uris, :port, nil, sniffing) || 9200
     end
-    
+
     def uris
       @options[:hosts]
     end
@@ -254,7 +240,7 @@ def http_compression
 
     def build_adapter(options)
       timeout = options[:timeout] || 0
-      
+
       adapter_options = {
         :socket_timeout => timeout,
         :request_timeout => timeout,
@@ -281,7 +267,7 @@ def build_adapter(options)
       adapter_class = ::LogStash::Outputs::ElasticSearch::HttpClient::ManticoreAdapter
       adapter = adapter_class.new(@logger, adapter_options)
     end
-    
+
     def build_pool(options)
       adapter = build_adapter(options)
 
@@ -331,7 +317,7 @@ def host_to_url(h)
                     h.query
                   end
       prefixed_raw_query = raw_query && !raw_query.empty? ? "?#{raw_query}" : nil
-      
+
       raw_url = "#{raw_scheme}://#{postfixed_userinfo}#{raw_host}:#{raw_port}#{prefixed_raw_path}#{prefixed_raw_query}"
 
       ::LogStash::Util::SafeURI.new(raw_url)

lib/logstash/outputs/elasticsearch/http_client_builder.rb

@@ -11,13 +11,14 @@ def self.build(logger, hosts, params)
         :http_compression => params["http_compression"],
         :headers => params["custom_headers"] || {}
       }
-      
+
       client_settings[:proxy] = params["proxy"] if params["proxy"]
-      
+
       common_options = {
         :client_settings => client_settings,
         :metric => params["metric"],
-        :resurrect_delay => params["resurrect_delay"]
+        :resurrect_delay => params["resurrect_delay"],
+        :bulk_batch_size => params["bulk_batch_size"]
       }
 
       if params["sniffing"]
@@ -65,7 +66,7 @@ def self.build(logger, hosts, params)
         LogStash::ConfigurationError,
         "External versioning requires the presence of a version number."
       ) if external_version_types.include?(params.fetch('version_type', '')) and params.fetch("version", nil) == nil
- 
+
 
       # Create API setup
       raise(
@@ -144,7 +145,7 @@ def self.setup_ssl(logger, params)
 
     def self.setup_basic_auth(logger, params)
       user, password = params["user"], params["password"]
-      
+
       return {} unless user && password && password.value
 
       {

spec/integration/outputs/index_spec.rb

@@ -1,8 +1,8 @@
 require_relative "../../../spec/es_spec_helper"
 require "logstash/outputs/elasticsearch"
 
-describe "TARGET_BULK_BYTES", :integration => true do
-  let(:target_bulk_bytes) { LogStash::Outputs::ElasticSearch::TARGET_BULK_BYTES }
+describe "BATCH_BULK_SIZE", :integration => true do
+  let(:batch_bulk_size) { LogStash::Outputs::ElasticSearch::DEFAULT_BATCH_SIZE }
   let(:event_count) { 1000 }
   let(:events) { event_count.times.map { event }.to_a }
   let(:config) {
@@ -23,11 +23,11 @@
   end
 
   describe "batches that are too large for one" do
-    let(:event) { LogStash::Event.new("message" => "a " * (((target_bulk_bytes/2) / event_count)+1)) }
+    let(:event) { LogStash::Event.new("message" => "a " * (((batch_bulk_size/2) / event_count)+1)) }
 
     it "should send in two batches" do
       expect(subject.client).to have_received(:bulk_send).twice do |payload|
-        expect(payload.size).to be <= target_bulk_bytes
+        expect(payload.size).to be <= batch_bulk_size
       end
     end
 
@@ -38,7 +38,40 @@
 
       it "should send in one batch" do
         expect(subject.client).to have_received(:bulk_send).once do |payload|
-          expect(payload.size).to be <= target_bulk_bytes
+          expect(payload.size).to be <= batch_bulk_size
+        end
+      end
+    end
+  end
+
+  describe "custom bulk size set" do
+    let(:batch_bulk_size) { 5 * 1024 * 1024 }
+    let(:config) {
+      {
+        "hosts" => get_host_port,
+        "index" => index,
+        "bulk_batch_size" => batch_bulk_size
+      }
+    }
+
+    describe "batches that are too large for one" do
+      let(:event) { LogStash::Event.new("message" => "a " * (((batch_bulk_size/2) / event_count)+1)) }
+
+      it "should send in two batches" do
+        expect(subject.client).to have_received(:bulk_send).twice do |payload|
+          expect(payload.size).to be <= batch_bulk_size
+        end
+      end
+
+      describe "batches that fit in one" do
+        # Normally you'd want to generate a request that's just 1 byte below the limit, but it's
+        # impossible to know how many bytes an event will serialize as with bulk proto overhead
+        let(:event) { LogStash::Event.new("message" => "a") }
+
+        it "should send in one batch" do
+          expect(subject.client).to have_received(:bulk_send).once do |payload|
+            expect(payload.size).to be <= batch_bulk_size
+          end
         end
       end
     end
@@ -53,7 +86,7 @@
   let(:config) { "not implemented" }
   let(:events) { event_count.times.map { event }.to_a }
   subject { LogStash::Outputs::ElasticSearch.new(config) }
-  
+
   let(:es_url) { "http://#{get_host_port}" }
   let(:index_url) {"#{es_url}/#{index}"}
   let(:http_client_options) { {} }
@@ -65,7 +98,7 @@
     subject.register
     subject.multi_receive([])
   end
-  
+
   shared_examples "an indexer" do |secure|
     it "ships events" do
       subject.multi_receive(events)
@@ -85,13 +118,13 @@
         expect(doc["_index"]).to eq(index)
       end
     end
-    
+
     it "sets the correct content-type header" do
       expected_manticore_opts = {:headers => {"Content-Type" => "application/json"}, :body => anything}
       if secure
         expected_manticore_opts = {
-          :headers => {"Content-Type" => "application/json"}, 
-          :body => anything, 
+          :headers => {"Content-Type" => "application/json"},
+          :body => anything,
           :auth => {
             :user => user,
             :password => password,
@@ -146,22 +179,22 @@
         :auth => {
           :user => user,
           :password => password
-        }, 
+        },
         :ssl => {
           :enabled => true,
           :ca_file => cacert
         }
       }
     end
     it_behaves_like("an indexer", true)
-    
+
     describe "with a password requiring escaping" do
       let(:user) { "f@ncyuser" }
       let(:password) { "ab%12#" }
-      
+
       include_examples("an indexer", true)
     end
-    
+
     describe "with a user/password requiring escaping in the URL" do
       let(:config) do
         {
@@ -171,7 +204,7 @@
           "index" => index
         }
       end
-      
+
       include_examples("an indexer", true)
     end
   end