[pve-devel] [PATCH guest-common 2/2] ReplicationState: deterministically order replication jobs

Thomas Lamprecht t.lamprecht at proxmox.com
Wed May 25 16:30:05 CEST 2022


On 24/05/2022 13:41, Dominik Csapak wrote:
> if we have multiple jobs for the same vmid with the same schedule,
> the last_sync, next_sync and vmid will always be the same, so the order
> depends on the order of the $jobs hash (which is random; thanks perl)
> 
> to have a fixed order, take the jobid also into consideration
> 
> Signed-off-by: Dominik Csapak <d.csapak at proxmox.com>
> ---
>  src/PVE/ReplicationState.pm | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/src/PVE/ReplicationState.pm b/src/PVE/ReplicationState.pm
> index 8eebb42..ae6b1fb 100644
> --- a/src/PVE/ReplicationState.pm
> +++ b/src/PVE/ReplicationState.pm
> @@ -322,7 +322,9 @@ sub get_next_job {
>  	return $res if $res != 0;
>  	$res = $joba->{next_sync} <=> $jobb->{next_sync};
>  	return $res if $res != 0;
> -	return  $joba->{guest} <=> $jobb->{guest};
> +	$res = $joba->{guest} <=> $jobb->{guest};
> +	return $res if $res != 0;
> +	return $a cmp $b;

nit, but couldn't this be

return  $joba->{guest} <=> $jobb->{guest} || $a cmp $b;

instead, the right side of the logical OR only gets evaluated if the left side's
result is 0 (well also on undef and empty string "", but that cannot happen
with the spaceship operator).

>      };
>  
>      foreach my $jobid (sort $sort_func keys %$jobs) {





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