Create GDB pretty printer to dump all active RecoveryUnits

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    • Type: Improvement
    • Resolution: Fixed
    • Priority: Major - P3
    • 4.4.0
    • Affects Version/s: None
    • Component/s: None
    • None
    • Fully Compatible
    • Execution Team 2020-05-04, Execution Team 2020-05-18
    • 13
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    • 3
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      I wrote a script to dump all RecoveryUnit states for all Clients in GDB, but it would be better (and I believe faster) to implement this as a proper printer in Python. The most challenging part of doing this manually from the debugger is traversing the Abseil hash set, but there is an existing utility function in our printers that would make this script even easier to implement in Python.

      define mongo_dump_txns
        set $client_set = $arg0->_clients
        set $capacity = $client_set.capacity_
        set $ctrl = $client_set.ctrl_
        set $i = 0 
        while ($i < $capacity)      
            if ($ctrl[$i] >= 0)
                set $client = (mongo::Client*) *$client_set.slots_[$i]
                print $client
                print $client->_desc
                if ($client->_opCtx != 0)
                    print $client->_opCtx
                    print *(WiredTigerRecoveryUnit*)$client->_opCtx->_recoveryUnit
                end
            end
            set $i = $i + 1 
        end     
end

              Assignee:
              James Heppenstall
              Reporter:
              Louis Williams
              Votes:
              1 Vote for this issue
              Watchers:
              5 Start watching this issue

                Created:
                Updated:
                Resolved: