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Subject [GitHub] kl0u commented on a change in pull request #7876: [FLINK-11751] Extend release notes for Flink 1.8
Date Fri, 01 Mar 2019 15:41:44 GMT
kl0u commented on a change in pull request #7876: [FLINK-11751] Extend release notes for Flink
1.8
URL: https://github.com/apache/flink/pull/7876#discussion_r261647841
 
 

 ##########
 File path: docs/release-notes/#flink-1.8.md#
 ##########
 @@ -0,0 +1,174 @@
+ Notes - Flink 1.8"
+---
+<!--
+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
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+"License"); you may not use this file except in compliance
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+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
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+"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
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+-->
+
+
+These release notes discuss important aspects, such as configuration, behavior, or dependencies,
that changed between Flink 1.7 and Flink 1.8. Please read these notes carefully if you are
planning to upgrade your Flink version to 1.8. 
+
+* This will be replaced by the TOC
+{:toc}
+
+### State
+
+#### Continuous incremental cleanup of old Keyed State with TTL
+
+We introduced TTL (time-to-live) for Keyed state in Flink 1.6
+([FLINK-9510](https://issues.apache.org/jira/browse/FLINK-9510)).  This feature
+allowed to clean up and make inaccessible keyed state entries when accessing
+them. In addition state would now also being cleaned up when writing a
+savepoint/checkpoint.
+
+Flink 1.8 introduces continous cleanup of old entries for both the RocksDB
+state backend
+([FLINK-10471](https://issues.apache.org/jira/browse/FLINK-10471)) and the heap
+state backend
+([FLINK-10473](https://issues.apache.org/jira/browse/FLINK-10473)). This means
+that old entries (according to the ttl setting) are continously being cleanup
+up.
+
+#### New Support for Schema Migration when restoring Savepoints
 
 Review comment:
   I think that the use of the terms "migration" is used here with two meanings: one is "migrating
the serializers", and the other "state evolution". I think it would be good to disambiguate
the two.

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