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Posted to dev@flink.apache.org by "fanrui (Jira)" <ji...@apache.org> on 2022/03/22 10:20:00 UTC

[jira] [Created] (FLINK-26803) Merge small ChannelState file for Unaligned Checkpoint

fanrui created FLINK-26803:
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             Summary: Merge small ChannelState file for Unaligned Checkpoint
                 Key: FLINK-26803
                 URL: https://issues.apache.org/jira/browse/FLINK-26803
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Checkpointing, Runtime / Network
            Reporter: fanrui


When making an unaligned checkpoint, the number of ChannelState files is TaskNumber * subtaskNumber. For high parallelism job, it writes too many small files. It causes high load for hdfs NN.

 

In our production, a job writes more than 50K small files for each Unaligned Checkpoint. Could we merge these files before write FileSystem? We can configure the maximum number of files each TM can write in a single Unaligned Checkpoint.



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