Stephan Ewen created FLINK-15132:
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Summary: Checkpoint Coordinator does Checkpoint I/O in JobMaster
Main Thread
Key: FLINK-15132
URL: https://issues.apache.org/jira/browse/FLINK-15132
Project: Flink
Issue Type: Bug
Components: Runtime / Checkpointing
Reporter: Stephan Ewen
Fix For: 1.10.0
The {{PendingCheckpoint.completePendingCheckpoint()}} method is called
synchronously from within the Scheduler / JobMaster Main Thread.
The method writes out the checkpoint metadata, which is a potentially blocking
I/O method.
Because the target may block arbitrarily long (for example S3 when load
throttling), this can bring down the entire cluster (blocking actor threads,
heartbeat timeouts).
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