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Commita7d3e32

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Fix race condition in subscription TAP test 021_twophase
The test did not wait for all the subscriptions to have caught up whendropping the subscription "tab_copy". In a slow environment, it couldbe possible for the replay of the COMMIT PREPARED transaction "mygid"to not be confirmed yet, causing one prepared transaction to be leftaround before moving to the next steps of the test.One failure noticed is a transaction found in pg_prepared_xacts for thecases where copy_data = false and two_phase = true, but there should benone after dropping the subscription.As an extra safety measure, a check is added before dropping thesubscription, scanning pg_prepared_xacts to make sure that no preparedtransactions are left once both subscriptions have caught up.Issue introduced bya8fd13c, fixing a problem similar toeaf5321.Per buildfarm member kestrel.Author: Vignesh C <vignesh21@gmail.com>Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>Discussion:https://postgr.es/m/CALDaNm329QaZ+bwU--bW6GjbNSZ8-38cDE8QWofafub7NV67oA@mail.gmail.comBackpatch-through: 15
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‎src/test/subscription/t/021_twophase.pl

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$node_publisher->safe_psql('postgres',"SELECT count(*) FROM tab_copy;");
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is($result,qq(6),'publisher inserted data');
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# Wait for both subscribers to catchup
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$node_publisher->wait_for_catchup($appname_copy);
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$node_publisher->wait_for_catchup($appname);
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# Make sure there are no prepared transactions on the subscriber
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$result =$node_subscriber->safe_psql('postgres',
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"SELECT count(*) FROM pg_prepared_xacts;");
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is($result,qq(0),'should be no prepared transactions on subscriber');
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$result =
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$node_subscriber->safe_psql('postgres',"SELECT count(*) FROM tab_copy;");

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