[Bug 293175] New: KMail/Akonadi heavy disk write usage when trying to remove duplicated mails

[LuRan]

https://bugs.kde.org/show_bug.cgi?id=293175

           Summary: KMail/Akonadi heavy disk write usage when trying to
                    remove duplicated mails
           Product: kmail2
           Version: unspecified
          Platform: Unlisted Binaries
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: hephooey_dev at fastmail.fm


Version:           unspecified
OS:                Linux

I have a maildir with 25k mails and about 3 GB large, because some mismatch
with the server kmail downloaded about 30 duplicated mails, I used the ctrl+*
to remove the duplicated mails, and it took several hours, while kmail 1
usually can finish in a few minutes. And when I used iotop to check the io
activity, several akonadi agent like akonadi_mailfilter_agent, WRITE to the
disk 10M/s. I could understand it read a lot of data in order to determine the
duplicated mails, but it is hard to explain why it had to write at 10M/s for
several hours to the disk?

Reproducible: Always

Steps to Reproduce:
ctrl+* in some large maildir directory

Actual Results:  
KMail/Akonadi use a lot of io and take a long time to finish

Expected Results:  
Like kmail1, finishes in a few miniute without heavy resource usage

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