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In streaming mode, the transaction can be decoded in multiple streams and those streams can be interleaved with streams of other transactions. So, we can't remember the transaction's write status in the logical decoding context because that might get changed due to some other transactions and lead to wrong answers for 'skip-empty-xacts' option. We decided to keep each transaction's write status in the ReorderBufferTxn to avoid interleaved streams changing the status of some unrelated transactions. Diagnosed-by: Amit Kapila Author: Dilip Kumar Reviewed-by: Amit Kapila Discussion: https://postgr.es/m/CAA4eK1LR7=XNM_TLmpZMFuV8ZQpoxkem--NZJYf8YXmesbvwLA@mail.gmail.com
44 lines
1.8 KiB
Ruby
44 lines
1.8 KiB
Ruby
# Test decoding of in-progress transaction containing dml and a concurrent
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# transaction with ddl operation. The transaction containing ddl operation
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# should not get streamed as it doesn't have any changes.
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setup
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{
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SELECT 'init' FROM pg_create_logical_replication_slot('isolation_slot', 'test_decoding');
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-- consume DDL
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SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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CREATE OR REPLACE FUNCTION large_val() RETURNS TEXT LANGUAGE SQL AS 'select array_agg(md5(g::text))::text from generate_series(1, 80000) g';
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}
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teardown
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{
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DROP TABLE IF EXISTS stream_test;
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DROP TABLE IF EXISTS stream_test1;
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SELECT 'stop' FROM pg_drop_replication_slot('isolation_slot');
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}
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session "s0"
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setup { SET synchronous_commit=on; }
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step "s0_begin" { BEGIN; }
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step "s0_ddl" {CREATE TABLE stream_test1(data text);}
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session "s2"
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setup { SET synchronous_commit=on; }
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step "s2_ddl" {CREATE TABLE stream_test2(data text);}
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# The transaction commit for s1_ddl will add the INTERNAL_SNAPSHOT change to
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# the currently running s0_ddl and we want to test that s0_ddl should not get
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# streamed when user asked to skip-empty-xacts. Similarly, the
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# INTERNAL_SNAPSHOT change added by s2_ddl should not change the results for
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# what gets streamed.
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session "s1"
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setup { SET synchronous_commit=on; }
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step "s1_ddl" { CREATE TABLE stream_test(data text); }
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step "s1_begin" { BEGIN; }
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step "s1_toast_insert" {INSERT INTO stream_test SELECT large_val();}
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step "s1_commit" { COMMIT; }
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step "s1_get_stream_changes" { SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL,NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');}
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permutation "s0_begin" "s0_ddl" "s1_ddl" "s1_begin" "s1_toast_insert" "s2_ddl" "s1_commit" "s1_get_stream_changes"
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