The following bug has been logged on the website:
Bug reference: 6676
Logged by: Tomonari Katsumata
Email address: katsumata.tomon...@po.ntts.co.jp
PostgreSQL version: Unsupported/Unknown
Operating system: RHEL 5.7 x86_64
Description:
Hi,
Now I'm testing the behavior of checkpointer,
and I found a difference with PostgreSQL9.1 behavior.
When I send SIGINT signal to writer process on PostgreSQL9.1,
writer process starts checkpoint.
But, when I send SIGINT signal to checkpointer on PostgreSQL9.2beta2,
checkpointer doesn't start checkpoint.
<PostgreSQL 9.1.3>
change the config file(postgresql.conf) to log information about
checkpoint.
log_checkpoints = on
logging_collector = on
$ psql postgres -c "create table tbl(i int)"
CREATE TABLE
$ psql postgres -c "insert into tbl values(1);"
INSERT 0 1
$ ps faxww | grep postgres | grep "writer process"
19706 ? Ss 0:00 \_ postgres: writer process
19707 ? Ss 0:00 \_ postgres: wal writer process
$ kill -2 19706
<log messages>
LOG: checkpoint starting:
LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s)
added, 0 removed, 0 recycled; write=0.000 s, sync=0.001 s, total=0.004 s;
sync files=1, longest=0.001 s, average=0.001 s
============
<PostgreSQL 9.2beta2>
change the config file(postgresql.conf) to log information about
checkpoint.
log_checkpoints = on
logging_collector = on
$ psql postgres -c "create table tbl(i int);"
CREATE TABLE
$ psql postgres -c "insert into tbl values(1);"
INSERT 0 1
$ ps faxww | grep checkpointer
11526 pts/3 S+ 0:00 | \_ grep checkpointer
11482 ? Ss 0:00 \_ postgres: checkpointer process
$ kill -2 11482
<no log messages>
============
I know "latch" is introduced on PostgreSQL9.2,
but I'm not sure this is a bug or not.
Is this a desirable behavior of "latch" ?
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