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Commitbac2fae

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logical decoding: process ASSIGNMENT during snapshot build
Most WAL records are ignored in early SnapBuild snapshot build phases.But it's critical to process some of them, so that later messages havethe correct transaction state after the snapshot is completely built; inparticular, XLOG_XACT_ASSIGNMENT messages are critical in order forsub-transactions to be correctly assigned to their parent transactions,or at least one assert misbehaves, as reported by Ildar Musin.Diagnosed-by: Masahiko SawadaAuthor: Masahiko SawadaDiscussion:https://postgr.es/m/CAONYFtOv+Er1p3WAuwUsy1zsCFrSYvpHLhapC_fMD-zNaRWxYg@mail.gmail.com
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‎src/backend/replication/logical/decode.c

Lines changed: 8 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -217,12 +217,15 @@ DecodeXactOp(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
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uint8info=XLogRecGetInfo(r)&XLOG_XACT_OPMASK;
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/*
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* No point in doing anything yet, data could not be decoded anyway. It's
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* ok not to call ReorderBufferProcessXid() in that case, except in the
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* assignment case there'll not be any later records with the same xid;
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* and in the assignment case we'll not decode those xacts.
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* If the snapshot isn't yet fully built, we cannot decode anything, so
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* bail out.
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*
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* However, it's critical to process XLOG_XACT_ASSIGNMENT records even
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* when the snapshot is being built: it is possible to get later records
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* that require subxids to be properly assigned.
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*/
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if (SnapBuildCurrentState(builder)<SNAPBUILD_FULL_SNAPSHOT)
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if (SnapBuildCurrentState(builder)<SNAPBUILD_FULL_SNAPSHOT&&
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info!=XLOG_XACT_ASSIGNMENT)
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return;
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switch (info)

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