public inbox for [email protected]
help / color / mirror / Atom feedFrom: Amit Kapila <[email protected]>
To: vignesh C <[email protected]>
Cc: Dilip Kumar <[email protected]>
Cc: Nisha Moond <[email protected]>
Cc: shveta malik <[email protected]>
Cc: Peter Smith <[email protected]>
Cc: Masahiko Sawada <[email protected]>
Cc: Bharath Rupireddy <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: Proposal: Conflict log history table for Logical Replication
Date: Fri, 26 Jun 2026 12:43:50 +0530
Message-ID: <CAA4eK1JOwP660Barcnpp4jcJmn2sNpbKLcYV3OXTp8xfJoiNRA@mail.gmail.com> (raw)
In-Reply-To: <CALDaNm2WP=ZBVy-5=f7w-s0u_tccJdtr4K79+jfXJ62kWKqsQw@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>
<CAJpy0uAA_XszCAcoBuCUM3VobD39DbMDwCPUT+XW7wFfE+_E8w@mail.gmail.com>
<CAFiTN-urKwsdyFvwz1go_C7jJFtLA8TJEhnaECAjuqkRk_1cXA@mail.gmail.com>
<CAJpy0uBhJGqD+OyA9Uk8bHyk61XWHEf3Le1QxkotwOLcQCqaZA@mail.gmail.com>
<CAFiTN-sbAXS6deUarPDunj2U+A6Dvhw_TASy4oMv4Tc63-_T9g@mail.gmail.com>
<CAJpy0uBaW7ziTsHOu_z37-epihxx3qGMjqdV+_-Z-RFjq5EOGg@mail.gmail.com>
<CAFiTN-sxVPbuqHjz99NGTz5UU0xgegsvpRa6=NkbP8_iW+X6-A@mail.gmail.com>
<CAJpy0uBs6D9ojMpz4MWgrxDbvRxqnvN+B+JnMNezBtuvhk_j9A@mail.gmail.com>
<CAFiTN-urmbTtk40RfLU8UMYtzk-_DLXwui3_G+TWp6XYKBphjw@mail.gmail.com>
<CABdArM5dtMEUw14-aDSht2Vh1tsgO67t_ZU8VQp=Ut7MwK5aEQ@mail.gmail.com>
<CAJpy0uBSY7zTH=4TvAOS=kj9vivBUc9NO+Vp6KNw-Na9RiAsMg@mail.gmail.com>
<CAFiTN-vqyo2=pgA_jUyQoWrOwUXxw1s3aYHcZBr_EHsztZN9jg@mail.gmail.com>
<CAJpy0uDGuaEvBym5VnE4mXJ_meo3jR7uG=c6wVbDAiuTjHcwrg@mail.gmail.com>
<CAA4eK1JhZYRMP_YYa1j3uAK6L4v057JDuM0+YLABOgAOYuwM8Q@mail.gmail.com>
<CABdArM6r0u6e2HQY3CQ15uZwOD2iTtVndecsNyK4R5tX9+eaNQ@mail.gmail.com>
<CAFiTN-tnBhCU8opWAjp1xYkjqGeXtQ1tfDZHbYBS7TifymXEvw@mail.gmail.com>
<CALDaNm0siWVCuTg6S8Xbk5SMHc91AX8Y+fAtOyV+cjwcpiFDWQ@mail.gmail.com>
<CAFiTN-vvJ42f4Bs679gVxBH8BpqmOskW1bnOUTUpy-x0L2wz_g@mail.gmail.com>
<CAA4eK1KsF+v3v6wOoWDWzj3fb_1kDi9dpf+aHdjz=2-k_C3mrg@mail.gmail.com>
<CALDaNm2GJYd6OBO9h=nTHuLt-Vg66nsGMv0GrvfX=S=nE3qqEg@mail.gmail.com>
<CAFiTN-tni=ADm_PrC2-H_6-4OdAqYNfUgQaFORdR6bnRNWrB1g@mail.gmail.com>
<CALDaNm3QaSpS6Er=9Q1Cj1Ry1QJoM8XaomyaFpp=_GKEp2MegQ@mail.gmail.com>
<CAA4eK1L7tSG6wEErAPd4MGO7yTXd-7fcWG74dgMqQ0Wz2Gw+hQ@mail.gmail.com>
<CAFiTN-tO8a724J0sL=TtjTnkAp0Ea7H3cZqjhb94nwX=3nd1ZQ@mail.gmail.com>
<CAA4eK1KfT-+FtUqd6iqYvghxBUcW4_1iP29bBGC-3QRdyeP7kQ@mail.gmail.com>
<CAFiTN-suQNZeGdih=caNza+8m=0ThQCig03d2PUa-nZSjmp-7Q@mail.gmail.com>
<CALDaNm2WP=ZBVy-5=f7w-s0u_tccJdtr4K79+jfXJ62kWKqsQw@mail.gmail.com>
On Fri, Jun 26, 2026 at 11:25 AM vignesh C <[email protected]> wrote:
>
> On Thu, 25 Jun 2026 at 19:15, Dilip Kumar <[email protected]> wrote:
> >
> > PFA, updated version of the patch, fixes all the comments of V57
>
> Currently, I have a use case where I would like to clean up conflict
> log records using a 'MERGE' statement.
>
> Consider a system that has accumulated conflict records over several
> days or weeks. Some of those conflicts have already been resolved, and
> in the meantime, a number of tables have been removed from the
> publication, dropped on the subscriber, or are otherwise no longer
> part of logical replication. However, the corresponding conflict log
> records remain in the conflict log table.
>
> One way to clean up such stale entries is to compare the 'relid'
> stored in the conflict log table with 'pg_class' and delete rows whose
> relations no longer exist. For example:
> MERGE INTO pg_conflict.pg_conflict_log_16404 AS cl
> USING pg_class AS c
> ON (cl.relid = c.oid)
> WHEN NOT MATCHED BY SOURCE THEN
> DELETE;
> However, this fails with:
> ERROR: cannot modify or insert data into conflict log table
> "pg_conflict_log_16404"
> DETAIL: Conflict log tables are system-managed and only support
> cleanup using DELETE or TRUNCATE.
>
> Although this 'MERGE' only performs a 'DELETE', it is still rejected.
>
> Is this restriction intentional? I can understand if supporting
> 'MERGE' is considered out of scope for this patch, but I wanted to
> check whether rejecting a delete-only 'MERGE' is an intentional design
> decision. If so, perhaps support for this use case could be considered
> in a future version.
>
Yes, in future versions, we may want to consider such cases. BTW,
can't we achieve this simply via DELETE?
--
With Regards,
Amit Kapila.
view thread (226+ 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]
Subject: Re: Proposal: Conflict log history table for Logical Replication
In-Reply-To: <CAA4eK1JOwP660Barcnpp4jcJmn2sNpbKLcYV3OXTp8xfJoiNRA@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