[tarantool-patches] Re: [PATCH 1/4] Fix races related to object outdating
Alex Khatskevich
avkhatskevich at tarantool.org
Tue Jul 31 14:05:12 MSK 2018
>>>> diff --git a/vshard/router/init.lua b/vshard/router/init.lua
>>>> index 142ddb6..1a0ed2f 100644
>>>> --- a/vshard/router/init.lua
>>>> +++ b/vshard/router/init.lua
>>>> @@ -88,15 +94,18 @@ local function bucket_discovery(bucket_id)
>>>> log.verbose("Discovering bucket %d", bucket_id)
>>>> local last_err = nil
>>>> local unreachable_uuid = nil
>>>> - for uuid, replicaset in pairs(M.replicasets) do
>>>> - local _, err =
>>>> - replicaset:callrw('vshard.storage.bucket_stat',
>>>> {bucket_id})
>>>> - if err == nil then
>>>> - bucket_set(bucket_id, replicaset)
>>>> - return replicaset
>>>> - elseif err.code ~= lerror.code.WRONG_BUCKET then
>>>> - last_err = err
>>>> - unreachable_uuid = uuid
>>>> + for uuid, _ in pairs(M.replicasets) do
>>>> + -- Handle reload/reconfigure.
>>>> + replicaset = M.replicasets[uuid]
>>>> + if replicaset then
>>>> + local _, err =
>>>> + replicaset:callrw('vshard.storage.bucket_stat', {bucket_id})
>>>> + if err == nil then
>>>> + return bucket_set(bucket_id, replicaset.uuid)
>>>
>>> Do not return error immediately. You can continue iteration in the hope
>>> of finding the bucket out on one of next replicasets. So here you
>>> do 'if bucket_set ~= nil then return result end'. Else continue.
>> Please, read it again. It seems like you misunderstood something.
>> I did not change the behavior here.
>
> You changed the behavior here. Before bucket_set never failed when
> 'err ~= nil' always a non-nil result was returned, even though outdated.
> Now you return nil.
Discussed verbally.
Further iteration in case of the error do not speeds up anything.
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