[
https://issues.apache.org/jira/browse/FLINK-26803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Piotr Nowojski reassigned FLINK-26803:
--------------------------------------
Assignee: fanrui
> 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
> 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.
--
This message was sent by Atlassian Jira
(v8.20.7#820007)
