24-3: Fix follower reads sometimes crashing during split

[snaury]

Changelog entry

Fix follower reads sometimes crashing during split.

Changelog category

• Bugfix

Additional information

It was discovered that when shard splits during a long follower read the node could crash with assertion, trying to read from a table that no longer exists due to their in-memory state and localdb schema diverging. Followers now sync their in-memory state and localdb schema before resuming paused reads, just like they do before starting new reads.

Fixes #12140.

[github-actions]

⚪ 2024-12-20 07:50:10 UTC Pre-commit check for 96f963f has started.
⚪ 2024-12-20 07:52:56 UTC Build linux-x86_64-release-asan is running...
🟢 2024-12-20 08:17:14 UTC Build successful.
⚪ 2024-12-20 08:17:31 UTC Tests are running...
🔴 2024-12-20 10:33:42 UTC Some tests failed, follow the links below.

Test history | Test log

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
10372	10273	0	28	29	42

🟢 2024-12-20 10:34:33 UTC ydbd size 5.6 GiB changed* by +5.9 KiB, which is < 100.0 KiB vs stable-24-3: OK

ydbd size dash	stable-24-3: 11eb58f	merge: 96f963f	diff	diff %
ydbd size	6 002 539 248 Bytes	6 002 545 264 Bytes	+5.9 KiB	+0.000%
ydbd stripped size	1 504 193 600 Bytes	1 504 198 656 Bytes	+4.9 KiB	+0.000%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2024-12-20 07:50:17 UTC Pre-commit check for 96f963f has started.
⚪ 2024-12-20 07:53:00 UTC Build linux-x86_64-relwithdebinfo is running...
🟢 2024-12-20 08:33:26 UTC Build successful.
⚪ 2024-12-20 08:33:40 UTC Tests are running...
🔴 2024-12-20 10:01:56 UTC Some tests failed, follow the links below.

Test history | Test log

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
14695	13345	0	11	1300	39

🟢 2024-12-20 10:02:57 UTC ydbd size 8.3 GiB changed* by +9.5 KiB, which is < 100.0 KiB vs stable-24-3: OK

ydbd size dash	stable-24-3: 11eb58f	merge: 96f963f	diff	diff %
ydbd size	8 873 502 784 Bytes	8 873 512 480 Bytes	+9.5 KiB	+0.000%
ydbd stripped size	484 350 248 Bytes	484 351 016 Bytes	+768 Bytes	+0.000%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}