[MDEV-32588] InnoDB may hang when running out of buffer pool - Jira

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Details

Type: Bug
Status: Closed (View Workflow)
Priority: Blocker
Resolution: Fixed
Affects Version/s: 10.6, 10.10(EOL), 10.11, 11.0(EOL), 11.1(EOL), 11.2(EOL)
Fix Version/s: 10.6.16, 10.10.7, 10.11.6, 11.0.4, 11.1.3, 11.2.2
Component/s: Storage Engine - InnoDB
Labels:
- corruption
- crash
- hang
- race
- regression

Description

While running performance tests with a small buffer pool, I encountered an anomaly where InnoDB would hang because of running out of buffer pool. There would be some actually clean blocks at buf_pool.flush_list.start, but these would be skipped by buf_flush_LRU_list_batch(). The buf_pool.flush_list.end is being trimmed by periodic calls to buf_pool.get_oldest_modification(). I suspect that the entire buf_pool.LRU would be skipped because of being buffer-fixed, latched, or registered in buf_pool.flush_list due to the ~~MDEV-26010~~ optimization.

This seems to be a 10.6 regression due to ~~MDEV-26827~~.

~~MDEV-32050~~ would make this problem worse by allowing the purge_coordinator_task to buffer-fix a large number of pages.

Attachments

Issue Links

is caused by

MDEV-26827 Make page flushing even faster

Closed

relates to

MDEV-33613 InnoDB may still hang when temporarily running out of buffer pool

Closed

MDEV-26010 Assertion `lsn > 2' failed in buf_pool_t::get_oldest_modification

Closed

MDEV-32050 UNDO logs still growing for write-intensive workloads

Closed

MDEV-33508 Performance regression due to frequent scan of full buf_pool.flush_list

Closed

Activity

People

Assignee:: Marko Mäkelä

Reporter:: Marko Mäkelä

Votes:: 0 Vote for this issue

Watchers:: 1 Start watching this issue

Dates

Created:: 2023-10-26 10:07

Updated:: 2024-08-08 06:37

Resolved:: 2023-10-27 13:05

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