I think it is out of scope of the task.

On Sunday, March 24, 2019 12:07:22 AM MSK Vladimir Davydov wrote:
> Local spaces can be modified even in read-only mode hence we don't need
> to abort transactions that modify only local spaces when switching to
> read-only mode.
> 
> Follow-up #4016
> ---
>  src/box/vy_tx.c          | 19 +++++++++++++++++--
>  test/vinyl/misc.result   | 38 ++++++++++++++++++++++++++++++++++++++
>  test/vinyl/misc.test.lua | 16 ++++++++++++++++
>  3 files changed, 71 insertions(+), 2 deletions(-)
> 
> diff --git a/src/box/vy_tx.c b/src/box/vy_tx.c
> index 56d594e5..67a9b384 100644
> --- a/src/box/vy_tx.c
> +++ b/src/box/vy_tx.c
> @@ -52,6 +52,7 @@
>  #include "trivia/util.h"
>  #include "tuple.h"
>  #include "column_mask.h"
> +#include "vclock.h"
>  #include "vy_cache.h"
>  #include "vy_lsm.h"
>  #include "vy_mem.h"
> @@ -1121,8 +1122,22 @@ tx_manager_abort_writers_for_ro(struct tx_manager
> *xm) struct vy_tx *tx;
>  	rlist_foreach_entry(tx, &xm->writers, in_writers) {
>  		/* Applier ignores ro flag. */
> -		if (tx->state == VINYL_TX_READY && !tx->is_applier_session)
> -			vy_tx_abort(tx);
> +		if (tx->state == VINYL_TX_READY && !tx->is_applier_session) {
> +			/*
> +			 * Don't abort transactions that modify only
> +			 * local spaces as they can be modified even
> +			 * in ro mode.
> +			 */
> +			struct vy_tx_space_hash_entry *entry;
> +			struct vy_tx_space_hash_iterator it;
> +			vy_tx_space_hash_ifirst(&tx->space_hash, &it);
> +			while ((entry = vy_tx_space_hash_inext(&it)) != NULL) {
> +				if (space_group_id(entry->space) != GROUP_LOCAL) 
{
> +					vy_tx_abort(tx);
> +					break;
> +				}
> +			}
> +		}
>  	}
>  }
> 
> diff --git a/test/vinyl/misc.result b/test/vinyl/misc.result
> index 4f613cb0..751f8795 100644
> --- a/test/vinyl/misc.result
> +++ b/test/vinyl/misc.result
> @@ -298,6 +298,16 @@ s:replace({1, 1})
>  ---
>  - [1, 1]
>  ...
> +s_local = box.schema.space.create('test_local', {engine = 'vinyl', is_local
> = true}) +---
> +...
> +_ = s_local:create_index('pk')
> +---
> +...
> +s_local:replace({1, 1})
> +---
> +- [1, 1]
> +...
>  test_run:cmd("setopt delimiter ';'")
>  ---
>  - true
> @@ -334,6 +344,19 @@ _ = fiber.create(function()
>  end);
>  ---
>  ...
> +-- Start rw transaction modifying only local spaces.
> +ch3 = fiber.channel(1);
> +---
> +...
> +_ = fiber.create(function()
> +    box.begin()
> +    s_local:replace{1, 2}
> +    ch3:get()
> +    local status, err = pcall(box.commit)
> +    ch3:put(status or err)
> +end);
> +---
> +...
>  test_run:cmd("setopt delimiter ''");
>  ---
>  - true
> @@ -351,6 +374,10 @@ ch2:put(true)
>  ---
>  - true
>  ...
> +ch3:put(true)
> +---
> +- true
> +...
>  ch1:get()
>  ---
>  - Can't modify data because this instance is in read-only mode.
> @@ -371,6 +398,10 @@ ch2:get()
>  ---
>  - true
>  ...
> +ch3:get()
> +---
> +- true
> +...
>  -- Cleanup.
>  box.cfg{read_only = false}
>  ---
> @@ -382,3 +413,10 @@ s:select()
>  s:drop()
>  ---
>  ...
> +s_local:select()
> +---
> +- - [1, 2]
> +...
> +s_local:drop()
> +---
> +...
> diff --git a/test/vinyl/misc.test.lua b/test/vinyl/misc.test.lua
> index bffaaf16..0616722f 100644
> --- a/test/vinyl/misc.test.lua
> +++ b/test/vinyl/misc.test.lua
> @@ -124,6 +124,9 @@ test_run:cmd('cleanup server test')
>  s = box.schema.space.create('test', {engine = 'vinyl'})
>  _ = s:create_index('pk')
>  s:replace({1, 1})
> +s_local = box.schema.space.create('test_local', {engine = 'vinyl', is_local
> = true}) +_ = s_local:create_index('pk')
> +s_local:replace({1, 1})
>  test_run:cmd("setopt delimiter ';'")
>  -- Start rw transaction.
>  ch1 = fiber.channel(1);
> @@ -149,18 +152,31 @@ _ = fiber.create(function()
>      local status, err = pcall(box.commit)
>      ch2:put(status or err)
>  end);
> +-- Start rw transaction modifying only local spaces.
> +ch3 = fiber.channel(1);
> +_ = fiber.create(function()
> +    box.begin()
> +    s_local:replace{1, 2}
> +    ch3:get()
> +    local status, err = pcall(box.commit)
> +    ch3:put(status or err)
> +end);
>  test_run:cmd("setopt delimiter ''");
>  -- Switch to ro mode.
>  box.cfg{read_only = true}
>  -- Resume the transactions.
>  ch1:put(true)
>  ch2:put(true)
> +ch3:put(true)
>  ch1:get()
>  ch1:get()
>  ch1:get()
>  ch2:get()
>  ch2:get()
> +ch3:get()
>  -- Cleanup.
>  box.cfg{read_only = false}
>  s:select()
>  s:drop()
> +s_local:select()
> +s_local:drop()