Fix flaky test isolation2/unlogged_heap_tables due to primary/mirror switch by fts. (#7338) (#7359)
unlogged_heap_tables test occasionally fails since during primary restarting there is a possibility that fts switches the mirrors to primaries. For unlogged table, there is no data on the mirrors so select query could return different results if there is or there is no switch, thus makes the test not deterministic. We disable fts probe in this test using gp fault injector to fix this issue. Co-authored-by: NHaozhou Wang <hawang@pivotal.io> Reviewed-by: NAshwin Agrawal <aagrawal@pivotal.io> Reviewed-by: NJimmy Yih <jyih@pivotal.io>
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