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Many python tests were setting the GC/compaction period to large values, to effectively disable GC / compaction. Reserve value 0 to mean "explicitly disabled". We also set them to 0 in unit tests now, although currently, unit tests don't launch the background jobs at all, so it won't have any effect. Fixes https://github.com/neondatabase/neon/issues/2917
48 lines
1.7 KiB
Python
48 lines
1.7 KiB
Python
import time
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from fixtures.neon_fixtures import NeonEnvBuilder
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#
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# Test truncation of FSM and VM forks of a relation
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#
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def test_truncate(neon_env_builder: NeonEnvBuilder, zenbenchmark):
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env = neon_env_builder.init_start()
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n_records = 10000
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n_iter = 10
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# Problems with FSM/VM forks truncation are most frequently detected during page reconstruction triggered
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# by image layer generation. So adjust default parameters to make it happen more frequently.
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tenant, _ = env.neon_cli.create_tenant(
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conf={
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# disable automatic GC
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"gc_period": "0s",
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# Compact and create images aggressively
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"checkpoint_distance": "1000000",
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"compaction_period": "1 s",
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"compaction_threshold": "3",
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"image_creation_threshold": "1",
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"compaction_target_size": "1000000",
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}
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)
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env.neon_cli.create_timeline("test_truncate", tenant_id=tenant)
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pg = env.postgres.create_start("test_truncate", tenant_id=tenant)
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cur = pg.connect().cursor()
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cur.execute("create table t1(x integer)")
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cur.execute(f"insert into t1 values (generate_series(1,{n_records}))")
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cur.execute("vacuum t1")
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for i in range(n_iter):
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cur.execute(f"delete from t1 where x>{n_records//2}")
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cur.execute("vacuum t1")
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time.sleep(1) # let pageserver a chance to create image layers
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cur.execute(f"insert into t1 values (generate_series({n_records//2+1}, {n_records}))")
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cur.execute("vacuum t1")
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time.sleep(1) # let pageserver a chance to create image layers
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cur.execute("select count(*) from t1")
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res = cur.fetchone()
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assert res is not None
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assert res[0] == n_records
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