Re: [PATCH v2] box: allow vinyl_memory set to 0 in config

[Sergey Petrenko <sergepetrenko@tarantool.org>]

04.07.2018 16:37, Vladimir Davydov пишет:
> On Wed, Jul 04, 2018 at 04:23:48PM +0300, Serge Petrenko wrote:
>> Sorry, forgot to post diff.
> All extra information that you want to get to the reviewer should go
> after --- (where you put branch and change log). This way it will be
> ignored by `git am` (we don't use it now, but people in other projects
> do and we might want to start using it instead of `git merge` one day).
>
>> In 1.9 it was possible to have a vinylless configuration with
>> vinyl_memory=0, allow to do this in 1.10 by adjusting sanity
>> checks for vinyl_memory and memtx_memory. Now banning only
>> negative values.
>> memtx_memory check was changed for consistency, trying to
>> set memtx_memory to 0 fails anyways.
>> Also added a test to check that vinyl_memory can actually
>> be set to 0.
>>
>> Closes: #3468
>> ---
>> https://github.com/tarantool/tarantool/tree/sergepetrenko/gh-3468-allow-0-vinyl-memory
>> https://github.com/tarantool/tarantool/issues/3468
>>
>> Changes in v2:
>> - added a test case to check vinyl_memory=0 is legal.
>> diff --git a/test/box-tap/cfg.test.lua b/test/box-tap/cfg.test.lua
>> index b93a21f35..764fade93 100755
>> --- a/test/box-tap/cfg.test.lua
>> +++ b/test/box-tap/cfg.test.lua
>> @@ -6,7 +6,7 @@ local socket = require('socket')
>>   local fio = require('fio')
>>   local uuid = require('uuid')
>>   local msgpack = require('msgpack')
>> -test:plan(91)
>> +test:plan(93)
>>   
>>   --------------------------------------------------------------------------------
>>   -- Invalid values
>> @@ -82,9 +82,15 @@ os.execute("rm -rf vinyl")
>>   box.cfg{
>>       log="tarantool.log",
>>       memtx_memory=104857600,
>> +    vinyl_memory=0,
>>       wal_mode = "", -- "" means default value
>>   }
>>   
>> +status, result = pcall(testfun)
>> +test:ok(status  and result == "table", "allow vinyl_memory set to 0 in box.cfg")
>> +test:is(box.cfg.vinyl_memory, 0, "vinyl_memory actually set to 0")
>> +
>> +box.cfg{vinyl_memory=128 * 1024 * 1024}
>>   -- gh-678: vinyl engine creates vinyl dir with empty 'snapshot' file
>>   test:isnil(io.open("vinyl", 'r'), 'vinyl_dir is not auto-created')
> That's not exactly what I meant. There's an easier way to test initial
> box configuration:
>
>    code = [[ box.cfg{ vinyl_memory=0 } ]]
>    test:is(run_script(code), 0, 'vinyl_memory is 0')
>
> (there are plenty of similar test cases in box-tap/cfg.test.lua)
>
> Also, when you add a test case, please write a brief description with a
> reference to the github ticket you're fixing, e.g.
>
> (also from box-tap/cfg.test.lua)
>> -- gh-2664: vinyl_dir is checked on the first use
>> code = [[ box.cfg{ vinyl_dir='invalid' } ]]
>> test:is(run_script(code), 0, 'vinyl_dir is invalid')
Done

diff --git a/test/box-tap/cfg.test.lua b/test/box-tap/cfg.test.lua
index b93a21f35..5608f6578 100755
--- a/test/box-tap/cfg.test.lua
+++ b/test/box-tap/cfg.test.lua
@@ -6,7 +6,7 @@ local socket = require('socket')
  local fio = require('fio')
  local uuid = require('uuid')
  local msgpack = require('msgpack')
-test:plan(91)
+test:plan(92)

  --------------------------------------------------------------------------------
  -- Invalid values
@@ -164,6 +164,13 @@ function run_script(code)
      return res
  end

+-- gh-3468: should allow box.cfg with vinyl_memory=0
+code =[[
+box.cfg{vinyl_memory=0}
+os.exit(box.cfg.vinyl_memory == 0 and 0 or 1)
+]]
+test:is(run_script(code), 0, "actually set vinyl_memory to 0")
+
  -- gh-715: Cannot switch to/from 'fsync'
  code = [[ box.cfg{ log="tarantool.log", wal_mode = 'fsync' }; ]]
  test:is(run_script(code), 0, 'wal_mode fsync')