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pt-table-checksum false positives?

bexicusmaximusbexicusmaximus EntrantInactive User Role Beginner
The issue I am running into is that in the first command (using --replicate to compute the actual checksums), I see 1's appear in the DIFFS column for various tables. However, when I run --replicate-check-only command after the checksum command, it reports no DIFFS. This seems contradictory. I then checked percona.checksums table in the database for some of the tables in question and the CRC is identical on master and slave. In addition, there are no row mismatches between master and slave. Therefore, I'm left to wonder, why did the checksum output report a 1 in the DIFF column?

Has anyone else run into this or know of why this would occur?


  • rodrigorodrigo Contributor Current User Role Novice
    I have the same problem using MD5. Same version of PT with Percona MySQL 5.6.
  • psongpsong Contributor Inactive User Role Beginner
    Please use the latest version of the tool. If you have the problem again, please paste the full command, command output and related data from slave server's percona.checksums table.
  • rodrigorodrigo Contributor Current User Role Novice
    It's been a while but recently false positives have come back:
    My versions are:
    Server version: 5.6.17-66.0-log Percona Server (GPL), Release 66.0, Revision 608

    my command is the following:
    pt-table-checksum --config /etc/percona_tools/etc/ivy-checksums.conf

    attached two files:
    and my and checksums table.
  • rodrigorodrigo Contributor Current User Role Novice
    ivy-checksums.conf zipped...
  • rodrigorodrigo Contributor Current User Role Novice
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