mon/MgrMonitor: do not propose again for "mgr fail" #47834
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in 23c3f76, the change to fail the mgr is proposed immediately. but `MgrMonitor::prepare_command()` method still returns `true` in this case. its indirect caller of `PaxosService::dispatch()` considers this as a sign that it needs to propose the change with `propose_pending()`. but the pending change has already been proposed by `MgrMonitor::prepare_command()`, and `have_pending` is also cleared by this call. as we don't allow consecutive paxos proposals, the second `propose_pending()` call is delayed with a configured latency. but when the timer is fired, this poseponed call would find itself trying to propose nothing. the change to fail the mgr has been proposed. that's why we have `ceph_assert(have_pending)` assertion failures. in this change, the second proposal is not proposed anymore if the proposal is proposed immediately. this should avoid the assertion failure. this change should address the regression introduced by 23c3f76. Fixes: https://tracker.ceph.com/issues/56850 Signed-off-by: Kefu Chai <tchaikov@gmail.com>
tchaikov
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rzarzynski
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Aug 29, 2022
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i cannot take it anymore. too many api test failures recently. will revert this change, if it does more harm than good. in the mean time, i will try to run it against the rados test suite. but the build is way too slow today. |
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in 23c3f76, the change to fail the mgr
is proposed immediately. but
MgrMonitor::prepare_command()method stillreturns
truein this case. its indirect caller ofPaxosService::dispatch()considers this as a sign that it needs topropose the change with
propose_pending(). but the pending change hasalready been proposed by
MgrMonitor::prepare_command(), andhave_pendingis also cleared by this call. as we don't allowconsecutive paxos proposals, the second
propose_pending()call isdelayed with a configured latency. but when the timer is fired, this
poseponed call would find itself trying to propose nothing. the change
to fail the mgr has been proposed. that's why we have
ceph_assert(have_pending)assertion failures.in this change, the second proposal is not proposed anymore if the
proposal is proposed immediately. this should avoid the assertion
failure.
this change should address the regression introduced by
23c3f76.
Fixes: https://tracker.ceph.com/issues/56850
Signed-off-by: Kefu Chai tchaikov@gmail.com
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