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The log is logged as below.

1. select the source file
2. log the source file list one by one
3. log `sequence` flag
4. create the target file
5. log the target file
6. start merge process
7. if finish merge a device, log (`device` `writer.offset`)
8. log `merge finished`
9. delete source files
10. delete the ${storagegroup}.compaction.log file

We write 3 sequence files(0-0-0.tsfile,1-1-0.tsfile,2-2-0.tsfile) with 10 device(root.compactionTest.device0,root.compactionTest.device1,...,root.compactionTest.device9) as an example

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