[flink] 03/04: [FLINK-16208] Add introduction to timely stream processing concepts documentation

[al...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

aljoscha pushed a commit to branch release-1.11
in repository https://gitbox.apache.org/repos/asf/flink.git

commit 973f24343911dab85456647804d3a7c15125dbf5
Author: Aljoscha Krettek <al...@apache.org>
AuthorDate: Tue Jun 9 17:14:19 2020 +0200

    [FLINK-16208] Add introduction to timely stream processing concepts documentation
---
 docs/concepts/timely-stream-processing.md | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/docs/concepts/timely-stream-processing.md b/docs/concepts/timely-stream-processing.md
index cb2c157..be8465f 100644
--- a/docs/concepts/timely-stream-processing.md
+++ b/docs/concepts/timely-stream-processing.md
@@ -24,11 +24,21 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-`TODO: add introduction`
-
 * This will be replaced by the TOC
 {:toc}
 
+## Introduction
+
+Timely steam processing is an extension of [stateful stream processing]({% link
+concepts/stateful-stream-processing.md %}) in which time plays some role in the
+computation. Among other things, this is the case when you do time series
+analysis, when doing aggregations based on certain time periods (typically
+called windows), or when you do event processing where the time when an event
+occured is important.
+
+In the following sections we will highlight some of the topics that you should
+consider when working with timely Flink Applications.
+
 ## Latency & Completeness
 
 `TODO: add these two sections`