Hi James, The checkpoint coordinator at the JobManager is triggering the checkpoints by inserting checkpoint barriers into the sources. These will get to the TaskManagers via the same communication channels data is flowing between them. Please refer to  for more details.
Nico  https://ci.apache.org/projects/flink/flink-docs-release-1.4/internals/stream_checkpointing.html On 06/04/18 13:47, Data Engineer wrote: > I have a Flink application (v 1.4.2) where I have enabled checkpointing > with an interval of 200 ms. > This is what I have configured in my driver program: > > env.enableCheckpointing(checkpointInterval, > CheckpointingMode.EXACTLY_ONCE); > CheckpointConfig config = env.getCheckpointConfig(); > > config.enableExternalizedCheckpoints(ExternalizedCheckpointCleanup.RETAIN_ON_CANCELLATION); > > In the JobManager logs, I see multiple entries saying "Checkpoint > triggered". > I would like to clarify whether the JobManager is triggering the > checkpoint every 200 ms? Or does the JobManager only initiate the > checkpointing and the TaskManager do it on its own? > > Regards, > James > > > -- Nico Kruber | Software Engineer data Artisans Follow us @dataArtisans -- Join Flink Forward - The Apache Flink Conference Stream Processing | Event Driven | Real Time -- Data Artisans GmbH | Stresemannstr. 121A,10963 Berlin, Germany data Artisans, Inc. | 1161 Mission Street, San Francisco, CA-94103, USA -- Data Artisans GmbH Registered at Amtsgericht Charlottenburg: HRB 158244 B Managing Directors: Dr. Kostas Tzoumas, Dr. Stephan Ewen
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