Botond Dénes 34cdcaffae reader_concurrency_semaphore: un-bless permits when they become inactive ...

When the memory consumption of the semaphore reaches the configured
serialize threshold, all but the blessed permit is blocked from
consuming any more memory. This ensures that past this limit, only one
permit at a time can consume memory.
Such a blessed permit can be registered inactive. Before this patch, it
would still retain its blessed status when doing so. This could result
in this permit being re-queued for admission if it was evicted in the
meanwhile, potentially resulting in a complete deadlock of the semaphore:
* admission queue permits cannot be admitted because there is no memory
* admitter permits are all queued on memory, as none of them are blessed

This patch strips the blessed status from the permit when it is
registered as inactive. It also adds a unit test to verify this happens.

Fixes: #12603

Closes #12694

2023-02-01 21:02:17 +02:00

..

alternator

test/alternator: unskip test which works on modern Scylla

2023-01-27 14:10:07 +02:00

boost

reader_concurrency_semaphore: un-bless permits when they become inactive

2023-02-01 21:02:17 +02:00

broadcast_tables

test.py: harmonize topology logs with test.py format

2023-01-11 10:09:42 +01:00

cql

cql3: expr: relax evaluate_list() to allow allow NULL elements

2023-01-18 10:38:24 +02:00

cql-pytest

test/cql-pytest: regression tests for null lookup in local SI

2023-01-19 23:58:33 +02:00

lib

test: Add tmpdir to sstable test env

2023-01-26 11:47:06 +03:00

manual

code: Use http::re(quest|ply) instead of httpd:: ones

2022-12-01 17:33:35 +02:00

perf

Merge 'main, test: integrate perf tools into scylla' from Kefu Chai

2023-01-19 15:01:30 +02:00

pylib

Merge 'test/pylib: scylla_cluster: ensure there's space in the cluster pool when running a sequence of tests' from Kamil Braun

2023-02-01 12:37:39 +02:00

raft

raft: introduce not_a_member error and return it when non member tries to do add/modify_config

2022-12-05 17:11:04 +01:00

redis

test/{alternator,redis}: stop using deprecated "disutils" package

2022-07-11 08:00:45 +03:00

resource

wasm: test instances reuse

2022-07-20 18:19:25 +02:00

rest_api

test: add test checking recursive task status

2023-01-11 12:34:17 +01:00

scylla-gdb

scylla-gdb.py: add scylla get-config-value gdb command

2022-12-21 03:05:56 -05:00

topology

test: topology: wait for token ring/group 0 consistency after decommission

2023-02-01 16:49:22 +02:00

topology_raft_disabled

Merge 'raft: improve group 0 reconfiguration failure handling' from Kamil Braun

2023-01-17 21:23:15 +01:00

unit

cross-shard-barrier: Capture shared barrier in complete

2022-09-16 08:21:02 +03:00

__init__.py

test.py: (pylib) add Scylla Server and Artifact Registry

2022-05-25 20:26:37 +03:00

pytest

test: (pytest) fix the pytest wrapper to work on Ubuntu

2022-10-20 15:53:24 +03:00