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Posted to dev@flink.apache.org by "Jiayi Liao (Jira)" <ji...@apache.org> on 2020/11/21 09:34:00 UTC
[jira] [Created] (FLINK-20269) The flush happens too frequent in
SavepoinV2Serializer
Jiayi Liao created FLINK-20269:
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Summary: The flush happens too frequent in SavepoinV2Serializer
Key: FLINK-20269
URL: https://issues.apache.org/jira/browse/FLINK-20269
Project: Flink
Issue Type: Improvement
Components: Runtime / Checkpointing
Affects Versions: 1.9.0
Reporter: Jiayi Liao
The reason I notice this is, I find that the metadata's persistence can be very slow, especially when the network is unstable, and almost every time I dump the stack of the process, the bottleneck happens on Hdfs client waiting for Datanodes' ack during metadata's persistance.
I wonder, is it really necessary to flush the stream after every {{StreamStateHandle}}'s serialization?
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