leonardBang commented on a change in pull request #9525: [FLINK-13363][docs] Add documentation for streaming aggregate performance tuning URL: https://github.com/apache/flink/pull/9525#discussion_r318861793
########## File path: docs/dev/table/tuning/streaming_aggregation_optimization.md ########## @@ -0,0 +1,271 @@ +--- +title: "Streaming Aggregation" +nav-parent_id: tableapi_performance_tuning +nav-pos: 10 +--- +<!-- +Licensed to the Apache Software Foundation (ASF) under one +or more contributor license agreements. See the NOTICE file +distributed with this work for additional information +regarding copyright ownership. The ASF licenses this file +to you under the Apache License, Version 2.0 (the +"License"); you may not use this file except in compliance +with the License. You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, +software distributed under the License is distributed on an +"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +KIND, either express or implied. See the License for the +specific language governing permissions and limitations +under the License. +--> + +SQL is the most widely used language for data analytics. Flink's Table API and SQL enables users to define efficient stream analytics applications in less time and effort. Moreover, Flink Table API and SQL is effectively optimized, it integrates a lot of query optimizations and tuned operator implementations. But not all of the optimizations are enabled by default, so for some workloads, it is possible to improve performance by turning on some options. + +In this page, we will introduce some useful optimization options and the internals of streaming aggregation which will bring great improvement in some cases. + +<span class="label label-danger">Attention</span> Currently, the optimization options mentioned in this page are only supported for the Blink planner. + +<span class="label label-danger">Attention</span> Currently, the streaming aggregation optimization are only supported for [unbounded-aggregations]({{ site.baseurl }}/dev/table/sql.html#aggregations). Optimizations for [window aggregations]({{ site.baseurl }}/dev/table/sql.html#group-windows) will be supported in the future. Review comment: Maybe "the streaming aggregation **optimization** are" should be "the streaming aggregation **optimizations** are"? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
