everywhere: add skeletal support for the in_memory_tables feature
Forward-ported from scylla-enterprise.
Note that the feature has been deprecated and the implementation
is provided only for backward compatibility with pre-existing
features and schema.
Tested manually after adding the following to feature_service:
```
gms::feature workload_prioritization { *this, "WORKLOAD_PRIORITIZATION"sv };
```
Launched a single-node cluster running 2023.1.10
```
cqlsh> create KEYSPACE ks WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1};
cqlsh> create TABLE ks.test ( pk int PRIMARY KEY, val int ) WITH compaction = {'class': 'InMemoryCompactionStrategy'};
```
log:
```
Scylla version 2023.1.10-0.20241227.21cffccc1ccd with build-id bd65b8399cb13b713a87e57fe333cfcabfd50be7 starting ...
...
INFO 2024-12-27 19:45:16,563 [shard 0] migration_manager - Create new ColumnFamily: org.apache.cassandra.config.CFMetaData@0x600000f1b400[cfId=5529c630-c47a-11ef-bd1d-4295734ce5a8,ksName=ks,cfName=test,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type),comment=,readRepairChance=0,dcLocalReadRepairChance=0,tombstoneGcOptions={"mode":"timeout","propagation_delay_in_seconds":"3600"},gcGraceSeconds=864000,keyValidator=org.apache.cassandra.db.marshal.Int32Type,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=pk, type=org.apache.cassandra.db.marshal.Int32Type, kind=PARTITION_KEY, componentIndex=0, droppedAt=-9223372036854775808}, ColumnDefinition{name=val, type=org.apache.cassandra.db.marshal.Int32Type, kind=REGULAR, componentIndex=null, droppedAt=-9223372036854775808}],compactionStrategyClass=class org.apache.cassandra.db.compaction.InMemoryCompactionStrategy,compactionStrategyOptions={enabled=true},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=0,caching={"keys":"ALL","rows_per_partition":"ALL"},cdc={},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,triggers=[],isDense=false,in_memory=false,version=5529c631-c47a-11ef-bd1d-4295734ce5a8,droppedColumns={},collections={},indices={}]
INFO 2024-12-27 19:45:16,564 [shard 0] schema_tables - Creating ks.test id=5529c630-c47a-11ef-bd1d-4295734ce5a8 version=ec88d510-6aff-344a-914d-541d37081440
```
Upgraded to this branch and started scylla.
Verified that ks.test was successfuly loaded:
log:
```
INFO 2024-12-27 19:48:58,115 [shard 0:main] init - Scylla version 6.3.0~dev-0.20241227.a64c6dfc153e with build-id f9496134a09cf2e55d3865b9e9ff499f672aa7da starting ...
...
WARN 2024-12-27 19:53:02,948 [shard 1:main] CompactionStrategy - InMemoryCompactionStrategy is no longer supported. Defaulting to NullCompactionStrategy.
...
INFO 2024-12-27 19:53:02,948 [shard 0:main] database - Keyspace ks: Reading CF test id=5529c630-c47a-11ef-bd1d-4295734ce5a8 version=ec88d510-6aff-344a-914d-541d37081440 storage=/home/bhalevy/scylladb/data/ks/test-5529c630c47a11efbd1d4295734ce5a8
```
Then, tested:
```
cqlsh> describe KEYSPACE ks;
CREATE KEYSPACE ks WITH replication = {'class': 'org.apache.cassandra.locator.SimpleStrategy', 'replication_factor': '1'} AND durable_writes = true AND tablets = {'enabled': false};
CREATE TABLE ks.test (
pk int,
val int,
PRIMARY KEY (pk)
) WITH bloom_filter_fp_chance = 0.01
AND caching = {'keys': 'ALL', 'rows_per_partition': 'ALL'}
AND comment = ''
AND compaction = {'class': 'InMemoryCompactionStrategy'}
AND compression = {'sstable_compression': 'org.apache.cassandra.io.compress.LZ4Compressor'}
AND crc_check_chance = 1
AND default_time_to_live = 0
AND gc_grace_seconds = 864000
AND max_index_interval = 2048
AND memtable_flush_period_in_ms = 0
AND min_index_interval = 128
AND speculative_retry = '99.0PERCENTILE';
cqlsh> alter TABLE ks.test with compaction = {'class': 'SizeTieredCompactionStrategy'};
cqlsh> describe KEYSPACE ks;
CREATE KEYSPACE ks WITH replication = {'class': 'org.apache.cassandra.locator.SimpleStrategy', 'replication_factor': '1'} AND durable_writes = true AND tablets = {'enabled': false};
CREATE TABLE ks.test (
pk int,
val int,
PRIMARY KEY (pk)
) WITH bloom_filter_fp_chance = 0.01
AND caching = {'keys': 'ALL', 'rows_per_partition': 'ALL'}
AND comment = ''
AND compaction = {'class': 'SizeTieredCompactionStrategy'}
AND compression = {'sstable_compression': 'org.apache.cassandra.io.compress.LZ4Compressor'}
AND crc_check_chance = 1
AND default_time_to_live = 0
AND gc_grace_seconds = 864000
AND max_index_interval = 2048
AND memtable_flush_period_in_ms = 0
AND min_index_interval = 128
AND speculative_retry = '99.0PERCENTILE'
AND tombstone_gc = {'mode': 'timeout', 'propagation_delay_in_seconds': '3600'};
```
log:
```
INFO 2024-12-27 19:56:40,465 [shard 0:stmt] migration_manager - Update table 'ks.test' From org.apache.cassandra.config.CFMetaData@0x60000362d800[cfId=5529c630-c47a-11ef-bd1d-4295734ce5a8,ksName==ks,cfName=test,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type),comment=,tombstoneGcOptions={"mode":"timeout","propagation_delay_in_seconds":"3600"},gcGraceSeconds=864000,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=pk, type=org.apache.cassandra.db.marshal.Int32Type, kind=PARTITION_KEY, componentIndex=0, droppedAt=-9223372036854775808}, ColumnDefinition{name=val, type=org.apache.cassandra.db.marshal.Int32Type, kind=REGULAR, componentIndex=null, droppedAt=-9223372036854775808}],compactionStrategyClass=class org.apache.cassandra.db.compaction.InMemoryCompactionStrategy,compactionStrategyOptions={enabled=true},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=0,caching={"keys":"ALL","rows_per_partition":"ALL"},cdc={},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,triggers=[],isDense=false,version=ec88d510-6aff-344a-914d-541d37081440,droppedColumns={},collections={},indices={}] To org.apache.cassandra.config.CFMetaData@0x60000336e000[cfId=5529c630-c47a-11ef-bd1d-4295734ce5a8,ksName==ks,cfName=test,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type),comment=,tombstoneGcOptions={"mode":"timeout","propagation_delay_in_seconds":"3600"},gcGraceSeconds=864000,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=pk, type=org.apache.cassandra.db.marshal.Int32Type, kind=PARTITION_KEY, componentIndex=0, droppedAt=-9223372036854775808}, ColumnDefinition{name=val, type=org.apache.cassandra.db.marshal.Int32Type, kind=REGULAR, componentIndex=null, droppedAt=-9223372036854775808}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={enabled=true},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=0,caching={"keys":"ALL","rows_per_partition":"ALL"},cdc={},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,triggers=[],isDense=false,version=ecccf010-c47b-11ef-b52c-622f2f0e87c4,droppedColumns={},collections={},indices={}]
INFO 2024-12-27 19:56:40,466 [shard 0: gms] schema_tables - Altering ks.test id=5529c630-c47a-11ef-bd1d-4295734ce5a8 version=ecccf010-c47b-11ef-b52c-622f2f0e87c4
```
Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
Closes scylladb/scylladb#22068
88ae067ddb