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

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-26803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated FLINK-26803:
-----------------------------------
    Labels: pull-request-available  (was: )

> 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
>            Assignee: fanrui
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: image-2022-05-05-12-36-09-969.png
>
>
> 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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