[ https://issues.apache.org/jira/browse/FLINK-5601?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
bupt_ljy updated FLINK-5601: ---------------------------- Affects Version/s: 1.9.0 > Window operator does not checkpoint watermarks > ---------------------------------------------- > > Key: FLINK-5601 > URL: https://issues.apache.org/jira/browse/FLINK-5601 > Project: Flink > Issue Type: Improvement > Components: Runtime / Checkpointing > Affects Versions: 1.5.0, 1.6.0, 1.7.0, 1.8.0, 1.9.0 > Reporter: Ufuk Celebi > Assignee: bupt_ljy > Priority: Critical > Labels: pull-request-available > > During release testing [~stefanrichte...@gmail.com] and I noticed that > watermarks are not checkpointed in the window operator. > This can lead to non determinism when restoring checkpoints. I was running an > adjusted {{SessionWindowITCase}} via Kafka for testing migration and > rescaling and ran into failures, because the data generator required > determinisitic behaviour. > What happened was that on restore it could happen that late elements were not > dropped, because the watermarks needed to be re-established after restore > first. > [~aljoscha] Do you know whether there is a special reason for explicitly not > checkpointing watermarks? -- This message was sent by Atlassian JIRA (v7.6.3#76005)