We found that this problem appears also on shards with enabled checksums.
This shard has 1st timeline, which means there was no switchover after upgrade
to 9.6.
xdb11f(master)=# select pg_current_xlog_location(),
pg_xlogfile_name(pg_current_xlog_location());
pg_current_xlog_location | pg_xlogfile_name
--------------------------+--------------------------
30BA/5966AD38 | 00000001000030BA00000059
(1 row)
xdb11f(master)=# select * from page_header(get_raw_page(‘mytable', 1787));
lsn | checksum | flags | lower | upper | special | pagesize |
version | prune_xid
---------------+----------+-------+-------+-------+---------+----------+---------+-----------
1F43/8C432C60 | -3337 | 5 | 256 | 304 | 8192 | 8192 |
4 | 0
(1 row)
xdb11h(replica)=# select * from page_header(get_raw_page(‘mytable', 1787));
lsn | checksum | flags | lower | upper | special | pagesize |
version | prune_xid
---------------+----------+-------+-------+-------+---------+----------+---------+-----------
1B28/45819C28 | -17617 | 5 | 256 | 304 | 8192 | 8192 |
4 | 0
(1 row)
xdb11e(replica)=# select * from page_header(get_raw_page('mytable', 1787));
lsn | checksum | flags | lower | upper | special | pagesize |
version | prune_xid
---------------+----------+-------+-------+-------+---------+----------+---------+-----------
1B28/45819C28 | -17617 | 5 | 256 | 304 | 8192 | 8192 |
4 | 0
(1 row)
Master has newer page version and freeze bits.
xdb11f(master)=# select t_xmin, t_infomask::bit(32) & X'0300'::int::bit(32)
from heap_page_items(get_raw_page(‘mytable', 1787)) where lp = 42;
t_xmin | ?column?
-----------+----------------------------------
516651778 | 00000000000000000000001100000000
(1 row)
xdb11h(replica)=# select t_xmin, t_infomask::bit(32) & X'0300'::int::bit(32)
from heap_page_items(get_raw_page('mytable', 1787)) where lp = 42;
t_xmin | ?column?
-----------+----------------------------------
516651778 | 00000000000000000000000000000000
(1 row)
xdb11e(replica)=# select t_xmin, t_infomask::bit(32) & X'0300'::int::bit(32)
from heap_page_items(get_raw_page('mytable', 1787)) where lp = 42;
t_xmin | ?column?
-----------+----------------------------------
516651778 | 00000000000000000000000000000000
(1 row)
It seems like replica did not replayed corresponding WAL records.
Any thoughts?
Regards,
Dmitriy Sarafannikov
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