GitHub user aljoscha opened a pull request: https://github.com/apache/flink/pull/742
[FLINK-2098] Ensure checkpoints and element emission are in order Before, it could happen that a streaming source would keep emitting elements while a checkpoint is being performed. This can lead to inconsistencies in the checkpoints with other operators. This also adds a test that checks whether only one checkpoint is executed at a time and the serial behaviour of checkpointing and emission. You can merge this pull request into a Git repository by running: $ git pull https://github.com/aljoscha/flink checkpoint-hardening Alternatively you can review and apply these changes as the patch at: https://github.com/apache/flink/pull/742.patch To close this pull request, make a commit to your master/trunk branch with (at least) the following in the commit message: This closes #742 ---- commit 5df7410f44c640f3a183b525f697bbc11a69c69b Author: Aljoscha Krettek <aljoscha.kret...@gmail.com> Date: 2015-05-28T08:24:37Z [FLINK-2098] Ensure checkpoints and element emission are in order Before, it could happen that a streaming source would keep emitting elements while a checkpoint is being performed. This can lead to inconsistencies in the checkpoints with other operators. This also adds a test that checks whether only one checkpoint is executed at a time and the serial behaviour of checkpointing and emission. ---- --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---