Percona Toolkit moved to https://jira.percona.com/projects/PT

  1. Bug #997117
  2. Comment #8

Comment 8 for bug 997117

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Baron Schwartz (baron-xaprb) wrote : Re: [Bug 997117] pt-online-schema-change Threads_running check causes premature bailout

I am worried that you might be experiencing a bug that Daniel is currently working on: it's choosing the wrong index. 20 rows per second is SLOW. Please PTDEBUG it, then ctrl-C it right after it starts "nibbling" the table and let's see what index it's chosen.