public inbox for [email protected]
help / color / mirror / Atom feedFrom: Nisha Moond <[email protected]>
To: vignesh C <[email protected]>
Cc: Dilip Kumar <[email protected]>
Cc: Amit Kapila <[email protected]>
Cc: Peter Smith <[email protected]>
Cc: shveta malik <[email protected]>
Cc: Masahiko Sawada <[email protected]>
Cc: Bharath Rupireddy <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Cc: shveta malik <[email protected]>
Subject: Re: Proposal: Conflict log history table for Logical Replication
Date: Wed, 3 Jun 2026 16:18:42 +0530
Message-ID: <CABdArM5N0LgkHc+JOKcbDjpx=0hdWDx+J7y=US2apEEmi07oyw@mail.gmail.com> (raw)
In-Reply-To: <CABdArM7+rHeod_Rt2AFVV-CmgHK0uOg7tsonY4GPxq9=9ZwX4w@mail.gmail.com>
References: <CAFiTN-u5D5o_AGNbHRZHaOqAMWkxLf+hSk_r9X3gv6HbLOB5+g@mail.gmail.com>
<CALj2ACViThGQDYi-yeqUeHqG2Pozn2AiyvtDtjE6zhhbM0KsEA@mail.gmail.com>
<CAA4eK1+44b3vd_OWfiaVNtjf5Njb5cek09pmKRmttBByeg0NoA@mail.gmail.com>
<CAFiTN-v3L0WacCDx5dkOSonaZQbJfstXL4HrCPD1ahRdUsRnSg@mail.gmail.com>
<CALj2ACW63uuxh0fSoxEAF8OMWhz1dJKSkp268WJDzf5BUqCf5g@mail.gmail.com>
<CAFiTN-s9WWLOhW1TO27NtJwGf0bh2+MWyp3NEkZFeN_S5_p_rA@mail.gmail.com>
<CAA4eK1LxnsEx5sMbQkK5MHAgXKPROMQXQ0n=fKMwz+UsfKQaMQ@mail.gmail.com>
<CAD21AoDj+c4LXf2y4ESR-gVyv9d8V0G4R8R9pn-PcmT5zPzYcg@mail.gmail.com>
<CAA4eK1KokmAwNOL6bS-ip_E3F96PiQTjC4j-M+5vD1T6uUyi3Q@mail.gmail.com>
<CAFiTN-vFKE8E_N6h+peX9DP92mxCeFdm5A9Esn4DkLmNcZ-dOA@mail.gmail.com>
<CAFiTN-shLYf-fOTQ_dBf3Xfx05gxs_8d93MHZXyyz6w2Bg5geQ@mail.gmail.com>
<CAFiTN-tEgkKQHUikn6iBFCYf7XOObR7ncUq=OVh7WEk=6P4ymw@mail.gmail.com>
<CAFiTN-tQiakd8m+-d6WN6RpJXSv_JcropZ2oGzme4d1JudQhYg@mail.gmail.com>
<CAJpy0uDKbYWt+YPADj=4fHEvrGEWgnG1n_YsiGT_EZiZf0VSAw@mail.gmail.com>
<CAFiTN-t82BiXen+HfdR9jZyOpuSO92xonnUK=khXsiZWBfOxMA@mail.gmail.com>
<CAJpy0uAu2paxGAEffD=vaBTW9Jqbtxxawb8K8FgiASfeKPnGog@mail.gmail.com>
<CAJpy0uC0ZWgHOivJ102A1fMkppwK3RuSMafRPKyjwkmJrjhVUw@mail.gmail.com>
<CAFiTN-vFV9-zajrwjYHYyFnyQsooOAXW4CpxB5f-iT3APjOtoQ@mail.gmail.com>
<CAJpy0uBeU1dZgaqsSVKc=P=EVUKxRgVuHR8jDXFL-HLibbE-kQ@mail.gmail.com>
<CAA4eK1+FOkOxhzVLAnDymoNjp4i98H-L1+ZsWDgJEv-ndnTzTA@mail.gmail.com>
<CAFiTN-sVK6Bp+BawCJU_WpAXQSTX4OkKmce5EE4YNBgD-XSjZw@mail.gmail.com>
<CAA4eK1LbjV0bctib9wUnBpEkC+2rZFPnGuRtrKuc5AtUAzum+A@mail.gmail.com>
<CAFiTN-vq50N3QP9p3_SH+tJ8Pn=uRDb0X4qEcQZYcGW9AX88rQ@mail.gmail.com>
<CAFiTN-u3+zRGPESP5kUUfa6NxaWh1HL-gd1225KJ0Uvzi1urow@mail.gmail.com>
<CAA4eK1L4iNk6mNTC83PbYrRfUdtivH4U961PkdFfOO7mvc=USg@mail.gmail.com>
<CAFiTN-v+Mh64UfR5zb5rwgyGm6HS80XRSZ_XeaWkg8=+s9o3Kg@mail.gmail.com>
<CAFiTN-s3ZFHteQsiC3H4=AjTWxuwN-w69XQ3xL5X6YOMTua4pA@mail.gmail.com>
<CAJpy0uDe724nY59j-8hMapZ_Fru1Wo-NucF4Ea1B3Jrw=+J+UQ@mail.gmail.com>
<CAFiTN-uR=86L_5tyiA7n73EXCSCuDfQKfL5O=c8n7zZom8_ONQ@mail.gmail.com>
<CAD21AoDfOS-J0M9WbM3D20eGbSPzbfLQ-9XoYkxO4AZ9twqyvg@mail.gmail.com>
<CAFiTN-vMTg2X7vwfHLr5Gvy8ViV63_iaEcpHmM8V5GpA9-u8cg@mail.gmail.com>
<CAA4eK1+b2Ws0e_ZYJsgZAPn7VWndxAK_YM_QMKcfXst3e7F6Jg@mail.gmail.com>
<CAFiTN-v6hFKMPrSyTBsz=AtEETYMbOxrqvhZJsPQqKgQc4WCLw@mail.gmail.com>
<CAA4eK1KV3rYkaxys5fh-PtE9kq5xrFbiaRpOSPoRgQG494ek+g@mail.gmail.com>
<CAFiTN-utvu=QjY1QQ1a_TvkpkpvesMWo9M8wTFYLaOTPdpOJvw@mail.gmail.com>
<CAA4eK1+HoSOEqNwT3twArPNx4_D7hSUoEg2LnYhX8n9iUwhXgQ@mail.gmail.com>
<CAFiTN-tqmsfW0Sk=1RhzuduxqLrf9KEc8VOvBae+4aYxWTJwuA@mail.gmail.com>
<CAA4eK1JmCQ=DHe3HsqpX+P3mGDUd_Z7E7oAxdstK6822W6tuCw@mail.gmail.com>
<CAFiTN-uE4eAUYewuq3c5deAt3TtVork+H6rkUHRv68cOGr5rmQ@mail.gmail.com>
<CAFiTN-sJbhPX+LbA8YuQeYJpfGA2XA+OKXf8jCm04RoJOyzLvw@mail.gmail.com>
<CAJpy0uBPOyWj9itFjHzGXfrUuYS8KGmAvgdcV_9FPjWZ0EZz_w@mail.gmail.com>
<CAFiTN-s=iLE4qM4qmw9yXKqW09R_c_HqaSGeZXJ2EaTVfXss+g@mail.gmail.com>
<CAA4eK1KYo0vZpPSRc_4gVpa06-J39gxjs3tHFyckgkBfYJSfFA@mail.gmail.com>
<CAFiTN-vrKc6OWzrg6yvpwYcj79k=zkrDp3uwiZzjwrWLJAq6tw@mail.gmail.com>
<CAA4eK1LmvrfEgn1NUZZ=E3yMCjQdNZ5=_SBEry73-EmF6jM_PQ@mail.gmail.com>
<CAFiTN-vjfub5b3PqPQzfOw9BSjm8jt28ott+Hoz9CrRxJHzYkg@mail.gmail.com>
<CAFiTN-v=ANapYvRK+SOy2wJb4CSuD6Vb6_bTGuReM9Dv+3tucA@mail.gmail.com>
<CALDaNm1zEYoSdf2Ns-=UJRw95E5sbfpB0oaNUWtRJN27Q1Knhw@mail.gmail.com>
<CALDaNm3USsXVNBsfdpkp60HVgrTV4taWMk1xZYNBa7QUF=V0jg@mail.gmail.com>
<CAFiTN-sNg9ghLNkB2Kn0SwBGOub9acc99XZZU_d5NAcyW-yrEg@mail.gmail.com>
<CAJpy0uAF3EYcYdpTHdKMeXfvaPbNvnWrZUATrSLL1hqjao=33A@mail.gmail.com>
<CAFiTN-uikggCKp2LscTorKY5d3KF9j93DW0xebDcRX86G+ZsSw@mail.gmail.com>
<CAJpy0uDaOoVK8S3_xxTAcTDpfK1AY7tApw7nPOZG_gUz+DMi=Q@mail.gmail.com>
<CAA4eK1+AdeC5B9xrAXSKWGtTh-0d8xdD=fZttmOBm+c8o8thAQ@mail.gmail.com>
<CAFiTN-skBQAeuzuUd+PDK0Gqc8g+4x9ypBMwJhOrmW8ZCFKGSA@mail.gmail.com>
<CAJpy0uCdrsW5T+okq7xTOVxagje7FW3DOeY5B0CGKYa5VqF_tQ@mail.gmail.com>
<CAFiTN-u+_mFj9caYYFO7=_YHFXk5y=vvOm2H2=5hctYktmAVGA@mail.gmail.com>
<CALDaNm1aivk9KgQ5daeF6YZzuE+0wWc2yb7wb6qikNyvfPN0Sg@mail.gmail.com>
<CAJpy0uD6fTEUYJx3+yDbvB=VW7c5AaGoeSd7iwHdYYO=kYGn3g@mail.gmail.com>
<CALDaNm2YOOdJ25X1sJ+DYz37K6Qi4g0ZNFHb_pQMF9UqancnEA@mail.gmail.com>
<CAHut+PtMS5bENS0DVtBj+s3kUEOq61+hSkqLODjFB78egB0imQ@mail.gmail.com>
<CAFiTN-s_M83sfs+MHHbUrMesjsCPN4JWxY5MChCEiY1U-u7=9g@mail.gmail.com>
<CAFiTN-vj8NTm9w_L2XdhxJCub_RZw__YVUgfXa1B1kJzJctRNw@mail.gmail.com>
<CAJpy0uBDLnfhuSiev8W9ZMFNTzUmqhds2dKayUpLoN-z1dtsLA@mail.gmail.com>
<CAFiTN-uL9f0X+=Ep4BbAPvaTJA7S4XHM--G4BsnPJw4uJW7EGQ@mail.gmail.com>
<CAJpy0uDG=t-y_m8t1zpBzfz9viP3K8dyQgkruaraVT85UtTkrg@mail.gmail.com>
<CAFiTN-tR8Rhs8uhfbck0Ac4dd1MopvvYgjK39nWyNXRp9Z3Qww@mail.gmail.com>
<CAA4eK1Kf15UpNmpTTE2XyX=9PE_oTpOoy5xqg3rFWbxwwP4Rbg@mail.gmail.com>
<CAFiTN-tNqb0vjuadDz-as67ksSXa=aEK+JW=4b54RVmkUK1m2Q@mail.gmail.com>
<CAFiTN-vDCxx6ydUFo59L8qNBbierg4as3TGPPiavR7UZjYurzA@mail.gmail.com>
<CAHut+PsWms218ENALnytLEV4NpxjOrAYhChLDaMaeE65-vNgrQ@mail.gmail.com>
<CAFiTN-v9i9RmDvdUmtMUow4=b+nr0k7LKMyEQ+6ZF=EVdfBhBA@mail.gmail.com>
<CALDaNm2YTKwPDjt9OV49RgM0zbkWhMhNu228bj_7f+zzcPb-ew@mail.gmail.com>
<CAFiTN-t_4XvofM3an-WmykqnPE+9wf9U+o2M7p1CWd9eXkN88Q@mail.gmail.com>
<CAHut+PuaqNDfDu_3xkZR4OYxw-B7ew_WjpLXCBvMcSBJz2K6Xg@mail.gmail.com>
<CAFiTN-uqNN9S_hRuda_th5MEpywa15g+XO00yM6tNJ-spGRRJw@mail.gmail.com>
<CABdArM6QxXatkGefTHy__HgaYHBvbKesffeXzT8Vn-kvcvGK4w@mail.gmail.com>
<CAFiTN-tgMWr=TGPhs9BxaPuSC_jhM7sJJ4fHedE5W6=h40jLfA@mail.gmail.com>
<CABdArM5fgzfyC2mH3YGB8t8cJBHWqAG1BS6rJMk7mX-8=9d=Cg@mail.gmail.com>
<CABdArM568KF4WXdFX_aZkCiDK8R71Wpep0gC2a+cV8BMobwkrg@mail.gmail.com>
<CAFiTN-vQ0tu18BD3UmKPb0rzZyFMQAVgGbdpMA8iYLX7PZOqOA@mail.gmail.com>
<CALDaNm20PDtmG2E3qaTC+YuL5twv+c9k573wL3sb=OwgmZphxQ@mail.gmail.com>
<CAA4eK1LhOHa_TEznw+gFoq+w0vMvvsDG2g9Xq8Mwa8xZMY73og@mail.gmail.com>
<CAFiTN-vPDqrQ2rHykNgd+groFxqwBYFQF97R-Co2EmtUkV6MTg@mail.gmail.com>
<CAFiTN-vsd=wNiEPXPQhZnipAb--+mBUC01M-pcjBjbRockgCUA@mail.gmail.com>
<CAJpy0uCjSq_gUCJBfURhqtB6bLvkKSUL-sVXpaGKjEapv5+t+Q@mail.gmail.com>
<CAFiTN-uZ-LaStAY3NuCY-nb7GCB9joiHX7HtHEMseJ0xfnqVSg@mail.gmail.com>
<CAFiTN-vhJxRW5NQ628oidnk0KtHwKt11dW9-+vxqpXLTgjiYiA@mail.gmail.com>
<CALDaNm1cJURibYKY4+DuNosjM72C9oGheUF-roMyff__+AsKBw@mail.gmail.com>
<CAJpy0uD1_77TDAFc4jE-94X-WUus7Q3gGU0pXfC+Tticq1hFvA@mail.gmail.com>
<CAA4eK1LFcSc4XCj4mU-cv27F_6n6=+ehJ=YAsAnyBbz4Sv_tVg@mail.gmail.com>
<CAFiTN-s5ZtjXKrSbam7TNWJ9Ax-kCancXcestAnx2by7dK0-UA@mail.gmail.com>
<CAFiTN-u=Da32mXyz8jocEGtuLSG4ccXXj_aEzUTPp2zkLb3MVA@mail.gmail.com>
<CALDaNm1qY5e0thfsDB2uWXqZn4hgTWTxiUDwcF1hWA-jodsKYg@mail.gmail.com>
<CALDaNm1nFtv3dtdRdbqWo2Rf_av7XbxDfK1Orqjcqs_Su_cLRQ@mail.gmail.com>
<CABdArM7R498qC5Fr42aU_q-2Sc5QsT4dyKgmO_f6Uy=8oCAFXA@mail.gmail.com>
<CAFiTN-sRZ+Z_9B3ue2L4zkbcfmPjjcAjcR1C+px1PyAs+HGsSg@mail.gmail.com>
<CAFiTN-sdcjf9xJ2M-=ab5e4y662tTmFFiP4gHL44tC9PcQozcw@mail.gmail.com>
<CALDaNm2WNjaNxUijVkvT6y69D62rfCu8OMwU-Pf-84un2r_=ig@mail.gmail.com>
<CAHut+PvEP5uUR13xJ3gbNKGU49=Rg32DXMGZ2wL9jTcKHyN_=Q@mail.gmail.com>
<CALDaNm3Jb5AQTsFJFxYZZJCaheT7qToCZkEALfW-vsMMFxjOyQ@mail.gmail.com>
<CAHut+PtQn5U9i00qvBmjo0KBxyb+ZmBb38NzF91KnX4J86Jg_g@mail.gmail.com>
<CALDaNm1a1gzy0L38U394_4OFwGUS8ALgSONYj++VLimY0g9piQ@mail.gmail.com>
<CABdArM5X63AdtS99QKGjVijUd_Q_dV8QUDSo4nTHKJjn3JwtAg@mail.gmail.com>
<CAA4eK1+h=QV4Zi=PW8Zt2D6be5ki5Mu2HgdXcfUophptx6Mt_A@mail.gmail.com>
<CAFiTN-s-tuxar9Dp5He0CFa1pzfy1fmiwcBj6PtwD0hDodE5ng@mail.gmail.com>
<CAFiTN-sx=k+Th=uYsrLcS6YMZbPVi9Wrggn1w2Nzf9MLEU7YRQ@mail.gmail.com>
<CAFiTN-u5pcgAhXyJgj+p7-xmShtp0i8xA000tzjCLFQp_zMXUA@mail.gmail.com>
<CAFiTN-tRpS7b3qFqckqFtHETj0jyzj-8SxC1arjfwf-hQd47PQ@mail.gmail.com>
<CABdArM5Ka_m_GWhL_zZbeDPKmL-Wezwb4A-NHnO-v-fRDuhA-Q@mail.gmail.com>
<CAFiTN-sqEMAbZ2pTt=zMa=918NV7HVeXF4bCOF+swtzKnTy5yQ@mail.gmail.com>
<CALDaNm0WX0Vqoy2UQZh-2TpWraf4OYn28kWe9aGR=vxKwLA+bw@mail.gmail.com>
<CABdArM7+rHeod_Rt2AFVV-CmgHK0uOg7tsonY4GPxq9=9ZwX4w@mail.gmail.com>
On Wed, Jun 3, 2026 at 3:24 PM Nisha Moond <[email protected]> wrote:
>
> Thanks for the updated patches, please find my comments on the v44
> patches below. These appear to apply to v45-001 and v45-002 as well,
> as both are unchanged.
>
Here are couple more issues found during tests:
5) remote_commit_ts is available when streaming=on, in that case, we
are not updating it and hence see NULL in the CLT.
A simple test case:
-- publisher
ALTER SYSTEM SET logical_decoding_work_mem = '64kB';
SELECT pg_reload_conf();
CREATE TABLE t (a int PRIMARY KEY);
CREATE PUBLICATION pub FOR TABLE t;
-- subscriber (pre-insert the conflicting row, so copy_data=false)
CREATE TABLE t (a int PRIMARY KEY);
INSERT INTO t VALUES (1);
CREATE SUBSCRIPTION sub
CONNECTION 'host=localhost port=9933 dbname=postgres'
PUBLICATION pub WITH (conflict_log_destination = 'all', streaming
= on, copy_data = false);
Trigger a streaming conflict
-- publisher
BEGIN;
INSERT INTO t SELECT generate_series(2, 50000);
INSERT INTO t VALUES (1); -- conflicts with subscriber's existing row
COMMIT;
Check the CLT - remote_commit_ts is NULL despite timestamp being known
-- subscriber
SELECT conflict_type, remote_commit_ts, remote_commit_lsn
FROM pg_conflict.pg_conflict_log_<subid>;
conflict_type | remote_commit_ts | remote_commit_lsn
----------------+------------------+-------------------
insert_exists | | 0/1234ABC
I think we need to update it in apply_handle_stream_commit() -> case
TRANS_LEADER_APPLY:
remote_commit_ts = commit_data.committime;
~~~
6) Different ERRORs for superuser vs non-superuser
I created a subscription owned by a non-superuser (nisha), and the CLT
for it is:
postgres=# \d
List of relations
Schema | Name | Type | Owner
-------------+-----------------------+-------+---------
pg_conflict | pg_conflict_log_16469 | table | nisha
Now if I try to UPDATE the CLT as a superuser:
postgres=# update pg_conflict_log_16469 set conflict_type=
'INSERT_EXIST' where conflict_type='insert_exists';
ERROR: cannot modify or insert data into conflict log table
"pg_conflict_log_16469"
DETAIL: Conflict log tables are system-managed and only support
cleanup via DELETE or TRUNCATE.
However, running the same command as nisha (the sub/clt owner) results in:
postgres=# SET SESSION AUTHORIZATION nisha;
SET
postgres=> update pg_conflict_log_16469 set conflict_type=
'INSERT_EXIST' where conflict_type='insert_exists';
ERROR: permission denied for table pg_conflict_log_16469
I think the error should be consistent with the superuser case, rather
than failing with a generic permission error.
--
Thanks,
Nisha
view thread (100+ 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]
Subject: Re: Proposal: Conflict log history table for Logical Replication
In-Reply-To: <CABdArM5N0LgkHc+JOKcbDjpx=0hdWDx+J7y=US2apEEmi07oyw@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