public inbox for [email protected]
help / color / mirror / Atom feedFrom: vignesh C <[email protected]>
To: Nisha Moond <[email protected]>
Cc: shveta malik <[email protected]>
Cc: Bharath Rupireddy <[email protected]>
Cc: Peter Smith <[email protected]>
Cc: Amit Kapila <[email protected]>
Cc: Ajin Cherian <[email protected]>
Cc: Bertrand Drouvot <[email protected]>
Cc: Masahiko Sawada <[email protected]>
Cc: Nathan Bossart <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: Introduce XID age and inactive timeout based replication slot invalidation
Date: Tue, 19 Nov 2024 15:53:35 +0530
Message-ID: <CALDaNm2UUTfJczjR-rEQwKgmx=iFnuMnR1cXv7ccB+O9P15mYg@mail.gmail.com> (raw)
In-Reply-To: <CABdArM5141FHGvfNYD=pCybLDpmEWbRXFJW3HnEoieMScZ62-g@mail.gmail.com>
References: <CAD21AoAd0BX0L17YxSCbSNbj=3V7dvLVGY0WhwLHAt724rNCZA@mail.gmail.com>
<[email protected]>
<CAJpy0uBthb-RG=Xg+mM-G6Xy01JLcBsizJuz+xbti08qP_W7AQ@mail.gmail.com>
<CALj2ACVfDBcbybgyga7ia_KiQPAfEi_3=VDOGf2VU8RkJZSQpw@mail.gmail.com>
<[email protected]>
<CALj2ACUmp-F+irHYfNhmo_9yaCo7aGi7ZB20KQcDR3S9eT56hg@mail.gmail.com>
<Zg1WqRS/[email protected]>
<CALj2ACUBiRLHF7VYD-0nYVHSvVBSCQ_5OMbP4tE8Ys_rpvQ--A@mail.gmail.com>
<[email protected]>
<CALj2ACXbUzp-9tixeUK_dws5k+ARJaXxj8cj9W3adA0XNUS4Hg@mail.gmail.com>
<[email protected]>
<CALj2ACW8SYiRL8vGAhez=FdrzxO0W5pVFvN8GF7yKCO8_c=QdQ@mail.gmail.com>
<CAA4eK1+-ipXB+LuUiDNQ5L+sWJFpzK89k-Oc7xOG37AefrptoQ@mail.gmail.com>
<CALj2ACWhTY9mRc7sOpuao=GGidRjCVXc0SNtJ_DNman4nh5CcQ@mail.gmail.com>
<CALj2ACVY+Fd5vC0VjW=5VDK9mmt-Y+PDZxnBp8ngGAZc24Vv9g@mail.gmail.com>
<CALj2ACX0FVrx9f0c2g19Rb-WAJhm3wdyttde3YQtkotL6bUveA@mail.gmail.com>
<CALj2ACXQNGXokgx8APwdxrG4MHMF=cOz6XQtUL7EHua9oUfkgA@mail.gmail.com>
<CAFPTHDZPOc7pY4E0zJ2om0MZLMt+UuiX-VLsJyRO_aSyR8DsnA@mail.gmail.com>
<CALj2ACVu0EJ+QQ7W0oHbL_+hCtk+p-00MNhE4hfjFcXaMepMfg@mail.gmail.com>
<CAA4eK1KVbicrQQbMLEQiHEi9=VJpxrErrK7CiMamwaMPfff3WA@mail.gmail.com>
<CALj2ACXe8+xSNdMXTMaSRWUwX7v61Ad4iddUwnn=djSwx3GLLg@mail.gmail.com>
<CAHut+PuFzCHPCiZbpoQX59kgZbebuWT0gR0O7rOe4t_sdYu=OA@mail.gmail.com>
<CALj2ACUJg2faYd-_Wr3NWoj_GtbW5Bje3G9+o595GyEhcBkbrg@mail.gmail.com>
<CAHut+PuC7nwuT3+36zsLxtBAcUHrSaysrHb0_dxTXqMnFBKZBA@mail.gmail.com>
<CALj2ACWXQT3_HY40ceqKf1DadjLQP6b1r=0sZRh-xhAOd-b0pA@mail.gmail.com>
<CAHut+PtJxxaVhjDCFPqE_V63VaAN_bL+PHRMak=dkghoGrZc0Q@mail.gmail.com>
<CALj2ACXjkM4nEE5dXeV=NA2NmbE3AmonKEgudYBMqU3qO9-9fw@mail.gmail.com>
<CAJpy0uAwxc49Dz6t=-y_-z-MU+A4RWX4BR3Zri_jj2qgGMq_8g@mail.gmail.com>
<CAJpy0uC6nN3SLbEuCvz7-CpaPdNdXxH=feW5MhYQch-JWV0tLg@mail.gmail.com>
<CAJpy0uBXXJC6f04+FU1axKaU+p78wN0SEhUNE9XoqbjXj=hhgw@mail.gmail.com>
<CAJpy0uB48aCJX8gpwwv-kGoOK3WYXWatB=1pgr__UW-OjwKkDg@mail.gmail.com>
<CABdArM44oW0dQa6Vv5c4xcY54rvhaKsBOpbDVaYzf0F3hUZFPw@mail.gmail.com>
<CALDaNm2VQW_gpOJ-QWkEA_h18DN31ELEz2_7QmwWCAg9=Zew4A@mail.gmail.com>
<CABdArM5141FHGvfNYD=pCybLDpmEWbRXFJW3HnEoieMScZ62-g@mail.gmail.com>
On Tue, 19 Nov 2024 at 12:43, Nisha Moond <[email protected]> wrote:
>
> Attached is the v49 patch set:
> - Fixed the bug reported in [1].
> - Addressed comments in [2] and [3].
>
> I've split the patch into two, implementing the suggested idea in
> comment #5 of [2] separately in 001:
>
> Patch-001: Adds additional error reports (for all invalidation types)
> in ReplicationSlotAcquire() for invalid slots when error_if_invalid =
> true.
> Patch-002: The original patch with comments addressed.
Few comments:
1) I felt this check in wait_for_slot_invalidation is not required as
there is a call to trigger_slot_invalidation which sleeps for
inactive_timeout seconds and ensures checkpoint is triggered, also the
test passes without this:
+ # Wait for slot to become inactive
+ $node->poll_query_until(
+ 'postgres', qq[
+ SELECT COUNT(slot_name) = 1 FROM pg_replication_slots
+ WHERE slot_name = '$slot' AND active = 'f' AND
+ inactive_since IS NOT NULL;
+ ])
+ or die
+ "Timed out while waiting for slot $slot to become inactive
on node $node_name";
2) Instead of calling this in a loop, won't it be enough to call
checkpoint only once explicitly:
+ for (my $i = 0; $i < 10 *
$PostgreSQL::Test::Utils::timeout_default; $i++)
+ {
+ $node->safe_psql('postgres', "CHECKPOINT");
+ if ($node->log_contains(
+ "invalidating obsolete replication
slot \"$slot\"", $offset))
+ {
+ $invalidated = 1;
+ last;
+ }
+ usleep(100_000);
+ }
+ ok($invalidated,
+ "check that slot $slot invalidation has been logged on
node $node_name"
+ );
3) Since pg_sync_replication_slots is a sync call, we can directly use
"is( $standby1->safe_psql('postgres', SELECT COUNT(slot_name) = 1 FROM
pg_replication_slots..." instead of poll_query_until:
+$standby1->safe_psql('postgres', "SELECT pg_sync_replication_slots();");
+$standby1->poll_query_until(
+ 'postgres', qq[
+ SELECT COUNT(slot_name) = 1 FROM pg_replication_slots
+ WHERE slot_name = 'sync_slot1' AND
+ invalidation_reason = 'inactive_timeout';
+])
+ or die
+ "Timed out while waiting for sync_slot1 invalidation to be synced
on standby";
4) Since this variable is being referred to at many places, how about
changing it to inactive_timeout_1s so that it is easier while
reviewing across many places:
# Set timeout GUC on the standby to verify that the next checkpoint will not
# invalidate synced slots.
my $inactive_timeout = 1;
5) Since we have already tested invalidation of logical replication
slot 'sync_slot1' above, this test might not be required:
+# =============================================================================
+# Testcase start
+# Invalidate logical subscriber slot due to inactive timeout.
+
+my $publisher = $primary;
+
+# Prepare for test
+$publisher->safe_psql(
+ 'postgres', qq[
+ ALTER SYSTEM SET replication_slot_inactive_timeout TO '0';
+]);
+$publisher->reload;
Regards,
Vignesh
view thread (98+ messages) latest in thread
reply
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: [email protected]
Cc: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected]
Subject: Re: Introduce XID age and inactive timeout based replication slot invalidation
In-Reply-To: <CALDaNm2UUTfJczjR-rEQwKgmx=iFnuMnR1cXv7ccB+O9P15mYg@mail.gmail.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox