Fix instability in 026_overwrite_contrecord.pl test.

We've seen intermittent failures in this test on slower buildfarm
machines, which I think can be explained by assuming that autovacuum
emitted some additional WAL.  Disable autovacuum to stabilize it.

In passing, use stringwise not numeric comparison to compare
WAL file names.  Doesn't matter at present, but they are
hex strings not decimal ...

Discussion: https://postgr.es/m/1372189.1636499287@sss.pgh.pa.us

diff --git a/src/test/recovery/t/026_overwrite_contrecord.pl b/src/test/recovery/t/026_overwrite_contrecord.pl
index 9476f5f6dc4c9ee390b6141cc230734fda2dc71f..867b75937eb65ecd2471fdbe749501d9ce73d015 100644 (file)
--- a/src/test/recovery/t/026_overwrite_contrecord.pl
+++ b/src/test/recovery/t/026_overwrite_contrecord.pl
@@ -19,7 +19,12 @@ plan tests => 3;
 
 my $node = PostgresNode->get_new_node('primary');
 $node->init(allows_streaming => 1);
-$node->append_conf('postgresql.conf', 'wal_keep_segments=16');
+# We need these settings for stability of WAL behavior.
+$node->append_conf(
+       'postgresql.conf', qq(
+autovacuum = off
+wal_keep_segments = 16
+));
 $node->start;
 
 $node->safe_psql('postgres', 'create table filler (a int, b text)');
@@ -58,7 +63,7 @@ $node->safe_psql('postgres',
 #$node->safe_psql('postgres', qq{create table foo ()});
 my $endfile = $node->safe_psql('postgres',
        'SELECT pg_walfile_name(pg_current_wal_insert_lsn())');
-ok($initfile != $endfile, "$initfile differs from $endfile");
+ok($initfile ne $endfile, "$initfile differs from $endfile");
 
 # Now stop abruptly, to avoid a stop checkpoint.  We can remove the tail file
 # afterwards, and on startup the large message should be overwritten with new