[FLINK-18357] ContinuousFileReaderOperator checkpoint timeout when files and directories get larger

• Type: Improvement
• Status: Open
• Priority: Not a Priority
• Resolution: Unresolved
• Component/s: API / DataStream
• Assignee: Unassigned
• Reporter: Jark Wu
• Created: 18/Jun/20 07:04
• Updated: 16/Nov/21 13:56

Description

This is reported from user-zh, I tranlsated it into this issue: http://apache-flink.147419.n8.nabble.com/env-readFile-td4017.html

env.readFile(format,path, FileProcessingMode.PROCESS_CONTINUOUSLY, 60000)

It monitors a directory of A, we will generate a new directory under A every day, such as:

A/20200101/
A/20200102/
A/20200103/
.......
.......

However, as time goes on, it has to monitor 200 directories and 500 files in each directory until June. Then everytime, the checkpoint has to synchronize offsets of 200*500 files which is very large and checkpoint gets timeout.

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My though is that is it possible to have a configuration, to mark a sub-directory as idle after a inactive interval, then we don't need to checkpoint all the file offsets under it.