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https://issues.apache.org/jira/browse/FLINK-26803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17530907#comment-17530907
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Piotr Nowojski commented on FLINK-26803:
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{quote}
one file for each operator in the chain
{quote}
Do we really have a file for each operator for unaligned checkpoints? If so,
why is that the case?
> 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
> Priority: Major
>
> 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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