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The log is logged as below(the log operation is marked as orange).

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. if merge finished, generate *.resource file
9. writer.endFile
10. log `merge finished`
11. delete source files
12. delete the ${storagegroup}.compaction.log file

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