Botond Dénes bd57471e54 reader_concurrency_semaphore: don't evict inactive readers needlessly ...

Inactive readers should only be evicted to free up resources for waiting
readers. Evicting them when waiters are not admitted for any other
reason than resources is wasteful and leads to extra load later on when
these evicted readers have to be recreated end requeued.
This patch changes the logic on both the registering path and the
admission path to not evict inactive readers unless there are readers
actually waiting on resources.
A unit-test is also added, reproducing the overly-agressive eviction and
checking that it doesn't happen anymore.

Fixes: #11803

Closes #13286

2023-04-13 15:20:18 +03:00

..

alternator

Merge 'alternator: fix isolation of concurrent modifications to tags' from Nadav Har'El

2023-04-11 11:17:23 +03:00

boost

reader_concurrency_semaphore: don't evict inactive readers needlessly

2023-04-13 15:20:18 +03:00

broadcast_tables

raft: broadcast_tables: remove unused asyncio mark

2023-02-28 11:05:15 +02:00

cql

cql3: functions: validate arguments for 'token()' also

2023-02-26 19:01:58 +02:00

cql-pytest

cql-pytest: translate Cassandra's tests for DELETE operations

2023-04-11 09:10:11 +03:00

lib

sstable: Make storage instance based on storage options

2023-04-10 16:43:01 +03:00

manual

reader_permit: keep trace_state pointer on permit

2023-03-22 04:58:01 -04:00

object_store

test: Add object-storage test

2023-04-10 16:44:29 +03:00

perf

Merge 'sstables: prepare for uuid-based generation_type' from Benny Halevy

2023-03-30 17:05:07 +03:00

pylib

test.py: Equip it with minio server

2023-04-10 16:43:01 +03:00

raft

treewide: catch by reference

2023-03-21 15:43:00 +02:00

redis

test/cql-pytest: allow "run-cassandra" without building Scylla

2023-03-01 07:54:19 +02:00

resource

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rest_api

test: extend test_compaction_task.py to test rewrite sstables compaction

2023-04-11 13:07:22 +02:00

scylla-gdb

test/cql-pytest: allow "run-cassandra" without building Scylla

2023-03-01 07:54:19 +02:00

topology

raft: (test) test ip address change

2023-03-10 19:52:40 +03:00

topology_custom

test/pylib: topology: support clusters of initial size 0

2023-03-31 11:17:58 +02:00

topology_raft_disabled

test_raft_upgrade: add a test for schema commit log feature

2023-03-24 16:08:17 +04:00

unit

Merge 'treewide: improve compatibility with gcc 13' from Avi Kivity

2023-03-24 15:16:05 +02:00

__init__.py

…

CMakeLists.txt

build: cmake: add all tests

2023-03-17 12:56:09 +08:00