* [tarantool-patches] [PATCH V3] Prohibit router/storage configuration from different fibers
@ 2018-09-11 10:32 Evgeniy Zaikin
2018-09-20 19:59 ` [tarantool-patches] " Vladislav Shpilevoy
0 siblings, 1 reply; 2+ messages in thread
From: Evgeniy Zaikin @ 2018-09-11 10:32 UTC (permalink / raw)
To: tarantool-patches
From 5ce83d5db595455a14a58aedf9e6411f5adf1d7c Mon Sep 17 00:00:00 2001
From: rave4life <evgen4rave@gmail.com>
Date: Fri, 31 Aug 2018 16:41:11 +0300
Subject: [PATCH V3] Prohibit router/storage configuration from different fibers
Fixes: #140
---
Ticket:https://github.com/tarantool/vshard/issues/140
Branch:https://github.com/tarantool/vshard/tree/rave4life/gh-140-prohibit-multiple-cfg
On Thu, 30 Aug 2018 at 03:56, Vladislav Shpilevoy
<v.shpilevoy@tarantool.org> wrote:
>
> Hi! Thanks for the fixes. See 9 comments below.
>
> 1. Please, put your fixes inlined right after my
> remarks in a response email. It is hard sometimes
> so track which of my remarks are not fixed without
> this.
>
OK, see my patch below in this email.
> 2. Write all your questions about a patch into
> tarantool-patches. I paste here your question
> from a private email:
>
> > Hi! I have a question about writing test module. The test should fail
> > if patch (or any part of this patch) is absent. But it is difficult to
> > make it possible without any architectural distortion (e.g. without
> > making nested function calls, without redundant constructions and code
> > injection, without any overkills in working code). There are no
> > questions If no test needed, but...
> > So which way is correct:
> > 1. to make one more nested (redundant) call in router/storage code;
> > 2. to inject additional counters in 'vshard.util' module, witch
> > contains implementation of my path ?
> > Current PATCH v2, witch was already sent, implements 2nd way (test
> > fails if M.lock:put(true) / M.lock:get() is absent or disabled).
> > https://www.freelists.org/post/tarantool-patches/PATCH-v2-Prohibit-routerstorage-configuration-from-different-fibers
> >
> > Thank you for reviewing my patch.
>
> Answer is the following: neither of those things. Use M.errinj
> table for such error injections, as I said in the previous review.
> Look at its current content and how is it used to make the similar
> test for concurrent cfgs. Or dig into errinj.h in Tarantool to
> find which of existing ones can be used.
>
Fixed. M.errinj.ERRINJ_MULTIPLE_CFG was introduced.
> On 21/08/2018 06:27, Евгений Заикин wrote:
> > Adds prohibition of simultaneous router/storage configuration from
> > multiple fibers.
> > Fixes: #140
> >
> > ---
> > Ticket:https://github.com/tarantool/vshard/issues/140
> > Branch:https://github.com/tarantool/vshard/tree/rave4life/gh-140-prohibit-multiple-cfg
> >
> > Changes in v2:
> > - separated test for router and storage
> > - locker wrapper function moved to vshard.utils
> > test/router/multi_fiber_cfg.result | 38 +++++++++++++++++++++++++
> > test/router/multi_fiber_cfg.test.lua | 12 ++++++++
> > test/storage/multi_fiber_cfg.result | 41 +++++++++++++++++++++++++++
> > test/storage/multi_fiber_cfg.test.lua | 13 +++++++++
> > vshard/router/init.lua | 6 ++--
> > vshard/storage/init.lua | 4 +--
> > vshard/util.lua | 17 +++++++++++
> > 7 files changed, 126 insertions(+), 5 deletions(-)
> > create mode 100644 test/router/multi_fiber_cfg.result
> > create mode 100644 test/router/multi_fiber_cfg.test.lua
> > create mode 100644 test/storage/multi_fiber_cfg.result
> > create mode 100644 test/storage/multi_fiber_cfg.test.lua
> >
> > diff --git a/test/router/multi_fiber_cfg.result
> > b/test/router/multi_fiber_cfg.result
> > new file mode 100644
> > index 0000000..42a4055
> > --- /dev/null
> > +++ b/test/router/multi_fiber_cfg.result
> > @@ -0,0 +1,38 @@
> > +test_run = require('test_run').new()
> > +---
> > +...
> > +cfg = require('localcfg')
> > +---
> > +...
> > +cfg.memtx_memory = nil
>
> 3. Why do you modify cfg?
> The same question for storage test.
>
See 'localcfg.lua': memtx_memory = 100 * 1024 * 1024.
Cause memtx_memory always set to larger size in previous tests, an error occured
while vshard.router/vshard.storage applies this config:
cannot decrease memory size at runtime.
Removed obvious nullifying by reinitialization 'cfg' entries on-a-fly.
Should I kill all instances (or full cluster clleanup) before this test?
Prefered not to do it making tests run as fast as possible.
> > +---
> > +...
> > +vshard = require('vshard')
>
> 4. As I said in the previous review, please,
> put this test into router/router.test.lua. It
> is not worth a separate file.
OK, fixed.
>
> The same remark for storage test.
>
> > +---
> > +...
> > +fiber = require('fiber')
> > +---
> > +...
> > +vshard.router.cfg(cfg)
> > +---
> > +...
> > +c = fiber.channel(2)
> > +---
> > +...
> > +f = function() fiber.create(function() local status, err =
> > pcall(vshard.router.cfg, cfg) c:put(status and true or false) end) end
> > +---
> > +...
> > +f()
> > +---
> > +...
> > +f()
> > +---
> > +...
> > +c:get()
> > +---
> > +- true
> > +...
> > +c:get()
> > +---
> > +- true
> > +...
> > diff --git a/vshard/router/init.lua b/vshard/router/init.lua
> > index 60ceafa..6b7a2c5 100644
> > --- a/vshard/router/init.lua
> > +++ b/vshard/router/init.lua
> > @@ -860,7 +860,7 @@ end
> >
> > local router_mt = {
> > __index = {
> > - cfg = function(router, cfg) return router_cfg(router, cfg, false) end,
> > + cfg = function(router, cfg) return
> > util.locker_func(router_cfg, router, cfg, false) end,
>
> 5. Out of 80 symbols per line.
Fixed.
>
> > info = router_info;
> > buckets_info = router_buckets_info;
> > call = router_call;
> > diff --git a/vshard/storage/init.lua b/vshard/storage/init.lua
> > index f9b8000..83f7343 100644
> > --- a/vshard/storage/init.lua
> > +++ b/vshard/storage/init.lua
> > @@ -1871,7 +1871,7 @@ if not rawget(_G, MODULE_INTERNALS) then
> > rawset(_G, MODULE_INTERNALS, M)
> > else
> > reload_evolution.upgrade(M)
> > - storage_cfg(M.current_cfg, M.this_replica.uuid, true)
> > + util.locker_func(storage_cfg, M.current_cfg, M.this_replica.uuid, true)
>
> 6. Do not use tabs in Lua files for indentation.
>
OK, tabs are replaced by spaces.
> > M.module_version = M.module_version + 1
> > end
> >
> > @@ -1908,7 +1908,7 @@ return {
> > rebalancing_is_in_progress = rebalancing_is_in_progress,
> > recovery_wakeup = recovery_wakeup,
> > call = storage_call,
> > - cfg = function(cfg, uuid) return storage_cfg(cfg, uuid, false) end,
> > + cfg = function(cfg, uuid) return util.locker_func(storage_cfg,
> > cfg, uuid, false) end,
>
> 7. Out of 80.
>
Fixed.
> > info = storage_info,
> > buckets_info = storage_buckets_info,
> > buckets_count = storage_buckets_count,
> > diff --git a/vshard/util.lua b/vshard/util.lua
> > index 3afaa61..d52598b 100644
> > --- a/vshard/util.lua
> > +++ b/vshard/util.lua
> > @@ -134,10 +136,25 @@ local function async_task(delay, task, ...)
> > fiber.create(sync_task, delay, task, ...)
> > end
> >
> > +local function locker_func(f, ...)
> > + M.lock:put(true)
> > + if M.cfg_counter > 0 then
> > + error('Error: cfg_counter > 0')
> > + end
> > + M.cfg_counter = M.cfg_counter + 1
> > + local status, err = pcall(f, ...)
> > + M.cfg_counter = M.cfg_counter - 1
> > + M.lock:get()
> > + if not status then
> > + error(err)
> > + end
> > +end
>
> 8. Since you started working on this patch, multiple
> routers per process feature was pushed, so M now can
> not be used in router for the counter and the lock.
> Please, rebase. Now each router should have its own
> non-global lock.
>
Rebased, moved again to router and storage. Latch implementation
now is different for router and storage, because multiple routers
was pushed.
> 9. Please, write a comment to this function like it
> is done for other ones.
>
OK, short comment is written. But since latch wrapper function is
local per lua file, there is no need to write full description.
> > +
> > return {
> > tuple_extract_key = tuple_extract_key,
> > reloadable_fiber_create = reloadable_fiber_create,
> > generate_self_checker = generate_self_checker,
> > async_task = async_task,
> > + locker_func = locker_func,
> > internal = M,
> > }
> >
Please find below the fixed patch.
===================================
Changes in v3:
- Separated test for router and storage (rebased to existing tests)
- Locker wrapper function moved back to router/init.lua and storage/init.lua
- Error injection added
- Tabs removed
---
test/router/router.result | 39 ++++++++++++++++++++++++++++++++
test/router/router.test.lua | 14 ++++++++++++
test/storage/storage.result | 42 +++++++++++++++++++++++++++++++++++
test/storage/storage.test.lua | 15 +++++++++++++
vshard/router/init.lua | 35 ++++++++++++++++++++++++++---
vshard/storage/init.lua | 32 ++++++++++++++++++++++++--
6 files changed, 172 insertions(+), 5 deletions(-)
diff --git a/test/router/router.result b/test/router/router.result
index 000307d..ada8309 100644
--- a/test/router/router.result
+++ b/test/router/router.result
@@ -1140,6 +1140,45 @@ test_run:drop_cluster(REPLICASET_2)
while test_run:grep_log('router_1', 'disconnected from ') == nil do
fiber.sleep(0.1) end
---
...
+-- gh-140: prohibit vshard.router/storage.cfg from multiple fibers.
+cfg = {sharding = require('localcfg').sharding}
+---
+...
+vshard = require('vshard')
+---
+...
+fiber = require('fiber')
+---
+...
+vshard.router.cfg(cfg)
+---
+...
+vshard.router.internal.errinj.ERRINJ_MULTIPLE_CFG = false
+---
+...
+c = fiber.channel(2)
+---
+...
+f = function() fiber.create(function() local status, err =
pcall(vshard.router.cfg, cfg) c:put(status and true or false) end) end
+---
+...
+f()
+---
+...
+f()
+---
+...
+c:get()
+---
+- true
+...
+c:get()
+---
+- true
+...
+vshard.router.internal.errinj.ERRINJ_MULTIPLE_CFG = false
+---
+...
_ = test_run:cmd("stop server router_1")
---
...
diff --git a/test/router/router.test.lua b/test/router/router.test.lua
index 9f32d3e..fab476e 100644
--- a/test/router/router.test.lua
+++ b/test/router/router.test.lua
@@ -440,6 +440,20 @@ test_run:drop_cluster(REPLICASET_2)
-- gh-24: log all connnect/disconnect events.
while test_run:grep_log('router_1', 'disconnected from ') == nil do
fiber.sleep(0.1) end
+-- gh-140: prohibit vshard.router/storage.cfg from multiple fibers.
+cfg = {sharding = require('localcfg').sharding}
+vshard = require('vshard')
+fiber = require('fiber')
+vshard.router.cfg(cfg)
+vshard.router.internal.errinj.ERRINJ_MULTIPLE_CFG = false
+c = fiber.channel(2)
+f = function() fiber.create(function() local status, err =
pcall(vshard.router.cfg, cfg) c:put(status and true or false) end) end
+f()
+f()
+c:get()
+c:get()
+vshard.router.internal.errinj.ERRINJ_MULTIPLE_CFG = false
+
_ = test_run:cmd("stop server router_1")
_ = test_run:cmd("cleanup server router_1")
test_run:drop_cluster(REPLICASET_1)
diff --git a/test/storage/storage.result b/test/storage/storage.result
index e3e9e7f..0228445 100644
--- a/test/storage/storage.result
+++ b/test/storage/storage.result
@@ -688,6 +688,48 @@ rs:callro('echo', {'some_data'})
- null
- null
...
+-- gh-140: prohibit vshard.router/storage.cfg from multiple fibers.
+cfg = {sharding = {}}
+---
+...
+cfg.sharding[box.info.cluster.uuid] = {replicas = {}}
+---
+...
+cfg.sharding[box.info.cluster.uuid].replicas[box.info.uuid] = {uri =
'storage:storage@127.0.0.1:3309', name = 'test_storage', master =
true}
+---
+...
+vshard = require('vshard')
+---
+...
+fiber = require('fiber')
+---
+...
+vshard.storage.internal.errinj.ERRINJ_MULTIPLE_CFG = false
+---
+...
+c = fiber.channel(2)
+---
+...
+f = function() fiber.create(function() local status, err =
pcall(vshard.storage.cfg, cfg, box.info.uuid) c:put(status and true or
false) end) end
+---
+...
+f()
+---
+...
+f()
+---
+...
+c:get()
+---
+- true
+...
+c:get()
+---
+- true
+...
+vshard.storage.internal.errinj.ERRINJ_MULTIPLE_CFG = false
+---
+...
_ = test_run:switch("default")
---
...
diff --git a/test/storage/storage.test.lua b/test/storage/storage.test.lua
index c07730b..6ceaa52 100644
--- a/test/storage/storage.test.lua
+++ b/test/storage/storage.test.lua
@@ -182,6 +182,21 @@ util.has_same_fields(old_internal, vshard.storage.internal)
_, rs = next(vshard.storage.internal.replicasets)
rs:callro('echo', {'some_data'})
+-- gh-140: prohibit vshard.router/storage.cfg from multiple fibers.
+cfg = {sharding = {}}
+cfg.sharding[box.info.cluster.uuid] = {replicas = {}}
+cfg.sharding[box.info.cluster.uuid].replicas[box.info.uuid] = {uri =
'storage:storage@127.0.0.1:3309', name = 'test_storage', master =
true}
+vshard = require('vshard')
+fiber = require('fiber')
+vshard.storage.internal.errinj.ERRINJ_MULTIPLE_CFG = false
+c = fiber.channel(2)
+f = function() fiber.create(function() local status, err =
pcall(vshard.storage.cfg, cfg, box.info.uuid) c:put(status and true or
false) end) end
+f()
+f()
+c:get()
+c:get()
+vshard.storage.internal.errinj.ERRINJ_MULTIPLE_CFG = false
+
_ = test_run:switch("default")
test_run:drop_cluster(REPLICASET_2)
test_run:drop_cluster(REPLICASET_1)
diff --git a/vshard/router/init.lua b/vshard/router/init.lua
index 7573801..446b1a0 100644
--- a/vshard/router/init.lua
+++ b/vshard/router/init.lua
@@ -28,6 +28,7 @@ if not M then
---------------- Common module attributes ----------------
errinj = {
ERRINJ_CFG = false,
+ ERRINJ_MULTIPLE_CFG = false,
ERRINJ_FAILOVER_CHANGE_CFG = false,
ERRINJ_RELOAD = false,
ERRINJ_LONG_DISCOVERY = false,
@@ -53,6 +54,10 @@ local ROUTER_TEMPLATE = {
name = nil,
-- The last passed configuration.
current_cfg = nil,
+ -- Fiber channel as the locker to prevent multiple config.
+ cfg_lock = nil,
+ -- Configuration counter to control and verify locker.
+ cfg_counter = 0,
-- Time to outdate old objects on reload.
connection_outdate_delay = nil,
-- Bucket map cache.
@@ -594,6 +599,29 @@ local function router_cfg(router, cfg, is_reload)
end
end
+--------------------------------------------------------------------------------
+-- Configuration wrapper
+--------------------------------------------------------------------------------
+
+local function cfg_wrapper(router, ...)
+ local enable_lock = not M.errinj.ERRINJ_MULTIPLE_CFG
+ if enable_lock then
+ router.cfg_lock:put(true)
+ end
+ if router.cfg_counter > 0 then
+ error('Error: cfg_counter > 0')
+ end
+ router.cfg_counter = router.cfg_counter + 1
+ local status, err = pcall(router_cfg, router, ...)
+ router.cfg_counter = router.cfg_counter - 1
+ if enable_lock then
+ router.cfg_lock:get()
+ end
+ if not status then
+ error(err)
+ end
+end
+
--------------------------------------------------------------------------------
-- Bootstrap
--------------------------------------------------------------------------------
@@ -862,7 +890,7 @@ end
local router_mt = {
__index = {
- cfg = function(router, cfg) return router_cfg(router, cfg, false) end,
+ cfg = function(router, cfg) return cfg_wrapper(router, cfg, false) end,
info = router_info;
buckets_info = router_buckets_info;
call = router_call;
@@ -920,6 +948,7 @@ local function router_new(name, cfg)
local router = table.deepcopy(ROUTER_TEMPLATE)
setmetatable(router, router_mt)
router.name = name
+ router.cfg_lock = lfiber.channel(1)
M.routers[name] = router
local ok, err = pcall(router_cfg, router, cfg)
if not ok then
@@ -936,7 +965,7 @@ end
local function legacy_cfg(cfg)
if M.static_router then
-- Reconfigure.
- router_cfg(M.static_router, cfg, false)
+ cfg_wrapper(M.static_router, cfg, false)
else
-- Create new static instance.
local router, err = router_new(STATIC_ROUTER_NAME, cfg)
@@ -961,7 +990,7 @@ if not rawget(_G, MODULE_INTERNALS) then
rawset(_G, MODULE_INTERNALS, M)
else
for _, router in pairs(M.routers) do
- router_cfg(router, router.current_cfg, true)
+ cfg_wrapper(router, router.current_cfg, true)
setmetatable(router, router_mt)
end
if M.static_router then
diff --git a/vshard/storage/init.lua b/vshard/storage/init.lua
index dc059ba..7deb67b 100644
--- a/vshard/storage/init.lua
+++ b/vshard/storage/init.lua
@@ -48,6 +48,10 @@ if not M then
---------------- Common module attributes ----------------
-- The last passed configuration.
current_cfg = nil,
+ -- Fiber channel as the locker to prevent multiple config.
+ cfg_lock = lfiber.channel(1),
+ -- Configuration counter to control and verify locker.
+ cfg_counter = 0,
--
-- All known replicasets used for bucket re-balancing.
-- See format in replicaset.lua.
@@ -66,6 +70,7 @@ if not M then
total_bucket_count = 0,
errinj = {
ERRINJ_CFG = false,
+ ERRINJ_MULTIPLE_CFG = false,
ERRINJ_BUCKET_FIND_GARBAGE_DELAY = false,
ERRINJ_RELOAD = false,
ERRINJ_CFG_DELAY = false,
@@ -1843,6 +1848,29 @@ local function storage_cfg(cfg,
this_replica_uuid, is_reload)
collectgarbage()
end
+--------------------------------------------------------------------------------
+-- Configuration wrapper
+--------------------------------------------------------------------------------
+
+local function storage_cfg_wrapper(...)
+ local enable_lock = not M.errinj.ERRINJ_MULTIPLE_CFG
+ if enable_lock then
+ M.cfg_lock:put(true)
+ end
+ if M.cfg_counter > 0 then
+ error('Error: cfg_counter > 0')
+ end
+ M.cfg_counter = M.cfg_counter + 1
+ local status, err = pcall(storage_cfg, ...)
+ M.cfg_counter = M.cfg_counter - 1
+ if enable_lock then
+ M.cfg_lock:get()
+ end
+ if not status then
+ error(err)
+ end
+end
+
--------------------------------------------------------------------------------
-- Monitoring
--------------------------------------------------------------------------------
@@ -2060,7 +2088,7 @@ if not rawget(_G, MODULE_INTERNALS) then
rawset(_G, MODULE_INTERNALS, M)
else
reload_evolution.upgrade(M)
- storage_cfg(M.current_cfg, M.this_replica.uuid, true)
+ storage_cfg_wrapper(M.current_cfg, M.this_replica.uuid, true)
M.module_version = M.module_version + 1
end
@@ -2103,7 +2131,7 @@ return {
rebalancing_is_in_progress = rebalancing_is_in_progress,
recovery_wakeup = recovery_wakeup,
call = storage_call,
- cfg = function(cfg, uuid) return storage_cfg(cfg, uuid, false) end,
+ cfg = function(cfg, uuid) return storage_cfg_wrapper(cfg, uuid, false) end,
info = storage_info,
buckets_info = storage_buckets_info,
buckets_count = storage_buckets_count,
--
2.17.1.windows.1
^ permalink raw reply [flat|nested] 2+ messages in thread
* [tarantool-patches] Re: [PATCH V3] Prohibit router/storage configuration from different fibers
2018-09-11 10:32 [tarantool-patches] [PATCH V3] Prohibit router/storage configuration from different fibers Evgeniy Zaikin
@ 2018-09-20 19:59 ` Vladislav Shpilevoy
0 siblings, 0 replies; 2+ messages in thread
From: Vladislav Shpilevoy @ 2018-09-20 19:59 UTC (permalink / raw)
To: tarantool-patches, Evgeniy Zaikin
Hi! Sorry for the last response - I was on vacation last
2 weeks. See 8 comments below.
On 11/09/2018 12:32, Evgeniy Zaikin wrote:
> From 5ce83d5db595455a14a58aedf9e6411f5adf1d7c Mon Sep 17 00:00:00 2001
> From: rave4life <evgen4rave@gmail.com>
> Date: Fri, 31 Aug 2018 16:41:11 +0300
> Subject: [PATCH V3] Prohibit router/storage configuration from different fibers
>
> Fixes: #140
> ---
> Ticket:https://github.com/tarantool/vshard/issues/140
> Branch:https://github.com/tarantool/vshard/tree/rave4life/gh-140-prohibit-multiple-cfg
>
> diff --git a/test/router/router.result b/test/router/router.result
> index 000307d..ada8309 100644
> --- a/test/router/router.result
> +++ b/test/router/router.result
> @@ -1140,6 +1140,45 @@ test_run:drop_cluster(REPLICASET_2)
> while test_run:grep_log('router_1', 'disconnected from ') == nil do
> fiber.sleep(0.1) end
> ---
> ...
> +-- gh-140: prohibit vshard.router/storage.cfg from multiple fibers.
1. Sorry, still out of 80 symbols. It is a strict rule. Please,
inspect your patch carefully for such code style things before
sending to a review.
> +cfg = {sharding = require('localcfg').sharding}
> +---
> +...
> +vshard = require('vshard')
> +---
> +...
> +fiber = require('fiber')
2. Please, do not use 'default' server for testing
storage or router. Router/router.test.lua starts multiple
Tarantool instances: storage_1_a - storage_2_b and router_1
(see the very beginning of the test file) and switches
between them to test router or storage things. 'Default'
server shall not be used for this. Please, use test_run:switch
and router_1 server for a test. In such a case you will not
have require('vshard') and require('fiber') since they are
already loaded on router_1 instance.
There is a reason why 'default' can not be used - once a
router is started on an instance, it can not be stopped
without restart (its internal fibers, I mean). For the storage
things are worse - it creates new spaces, users, functions
and we have no way to cleanup those things. So once 'default'
is used for testing, it will affect next tests.
For this problem we have an issue: https://github.com/tarantool/vshard/issues/121
You can try it next after this patch is finished if you want.
> +---
> +...
> +vshard.router.cfg(cfg)
> +---
> +...
> +vshard.router.internal.errinj.ERRINJ_MULTIPLE_CFG = false
3. It is false by default already (as I see in router/init.lua),
so what is a point of this line? I removed it and the test
passed ok. I guess it is a typo. Please, fix.
> +---
> +...
> +c = fiber.channel(2)
> +---
> +...
> diff --git a/test/storage/storage.result b/test/storage/storage.result
> index e3e9e7f..0228445 100644
> --- a/test/storage/storage.result
> +++ b/test/storage/storage.result
> @@ -688,6 +688,48 @@ rs:callro('echo', {'some_data'})
> - null
> - null
> ...
> +-- gh-140: prohibit vshard.router/storage.cfg from multiple fibers.
> +cfg = {sharding = {}}
> +---
> +...
> +cfg.sharding[box.info.cluster.uuid] = {replicas = {}}
> +---
> +...
> +cfg.sharding[box.info.cluster.uuid].replicas[box.info.uuid] = {uri =
> 'storage:storage@127.0.0.1:3309', name = 'test_storage', master =
> true}
> +---
> +...
> +vshard = require('vshard')
> +---
> +...
> +fiber = require('fiber')
4. For the same reason I explained above, you do not
need 'require' here. This code is executed on 'storage_1_a' where
both fiber and vshard are loaded already
(see line storage.test.lua:137 - this is the latest switch before
your test).
> +---
> +...
> +vshard.storage.internal.errinj.ERRINJ_MULTIPLE_CFG = false
5. Same as 3.
> +---
> +...
> +c = fiber.channel(2)
> +---
> +...
> diff --git a/vshard/router/init.lua b/vshard/router/init.lua
> index 7573801..446b1a0 100644
> --- a/vshard/router/init.lua
> +++ b/vshard/router/init.lua
> @@ -28,6 +28,7 @@ if not M then
> ---------------- Common module attributes ----------------
> errinj = {
> ERRINJ_CFG = false,
> + ERRINJ_MULTIPLE_CFG = false,
> ERRINJ_FAILOVER_CHANGE_CFG = false,
> ERRINJ_RELOAD = false,
> ERRINJ_LONG_DISCOVERY = false,
> @@ -53,6 +54,10 @@ local ROUTER_TEMPLATE = {
> name = nil,
> -- The last passed configuration.
> current_cfg = nil,
> + -- Fiber channel as the locker to prevent multiple config.
> + cfg_lock = nil,
> + -- Configuration counter to control and verify locker.
> + cfg_counter = 0,
6. Please, remove cfg_counter. Its value > 0 is unreachable
during normal work of router/storage. If you need a counter for
testing lock, you can use erring.ERRINJ_MULTIPLE_CFG as a counter.
It is not necessary to make each errinj as a strict boolean. See
my proposal below in the comment 8.
> -- Time to outdate old objects on reload.
> connection_outdate_delay = nil,
> -- Bucket map cache.
> @@ -594,6 +599,29 @@ local function router_cfg(router, cfg, is_reload)
> end
> end
>
> +--------------------------------------------------------------------------------
> +-- Configuration wrapper
> +--------------------------------------------------------------------------------
7. Function comment should look like this:
--
-- My function description wrapped by 66
-- symbols.
-- @param name1 Parameter 1 description.
-- @param name2 Parameter 2 description.
--
-- [if returns anything]
-- @retval Returned value description.
-- @retval Next possible return value description.
--
> +
> +local function cfg_wrapper(router, ...)
> + local enable_lock = not M.errinj.ERRINJ_MULTIPLE_CFG
> + if enable_lock then
> + router.cfg_lock:put(true)
> + end
> + if router.cfg_counter > 0 then
> + error('Error: cfg_counter > 0')
> + end
> + router.cfg_counter = router.cfg_counter + 1
> + local status, err = pcall(router_cfg, router, ...)
> + router.cfg_counter = router.cfg_counter - 1
> + if enable_lock then
> + router.cfg_lock:get()
> + end
> + if not status then
> + error(err)
> + end
> +end
8. Too complex. Lets use errinj.ERRINJ_MULTIPLE_CFG as
an integer and set it to nil by default
M = {
...
errinj = {
...
ERRINJ_MULTIPLE_CFG = nil
}
...
}
...
function cfg_wrapper()
if ERRINJ_MULTIPLE_CFG then
ERRINJ_MULTIPLE_CFG = ERRINJ_MULTIPLE_CFG + 1
if ERRINJ_MULTIPLE_CFG > 1 then
error('Multiple cfgs at the same time')
end
status, err = pcall(router_cfg, router, ...)
ERRINJ_MULTIPLE_CFG = ERRINJ_MULTIPLE_CFG - 1
else
lock:put(true)
status, err = pcall(router_cfg, router, ...)
lock:get()
end
if not status then
error(err)
end
return
end
ERRINJ_MULTIPLE_CFG is nil by default and to active it
you can do this in a test:
ERRINJ_MULTIPLE_CFG = 0
This will trigger counter in my pseudo code above since '0'
in Lua is true.
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2018-09-20 19:59 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-09-11 10:32 [tarantool-patches] [PATCH V3] Prohibit router/storage configuration from different fibers Evgeniy Zaikin
2018-09-20 19:59 ` [tarantool-patches] " Vladislav Shpilevoy
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox