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Commitd0303bc

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Fix outdated comment that talked about seek position of WAL file.
Since commitc24dcd0, we have been using pg_pread() to read the WALfile, which doesn't change the seek position (unless we fall back tothe implementation in src/port/pread.c). Update comment accordingly.Backpatch-through: 12, where we started to use pg_pread()
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  • src/backend/access/transam

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‎src/backend/access/transam/xlog.c‎

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Original file line numberDiff line numberDiff line change
@@ -809,11 +809,9 @@ static XLogSegNo openLogSegNo = 0;
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/*
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* These variables are used similarly to the ones above, but for reading
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* the XLOG. Note, however, that readOff generally represents the offset
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* of the page just read, not the seek position of the FD itself, which
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* will be just past that page. readLen indicates how much of the current
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* page has been read into readBuf, and readSource indicates where we got
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* the currently open file from.
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* the XLOG. readOff is the offset of the page just read, readLen
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* indicates how much of it has been read into readBuf, and readSource
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* indicates where we got the currently open file from.
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* Note: we could use Reserve/ReleaseExternalFD to track consumption of
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* this FD too; but it doesn't currently seem worthwhile, since the XLOG is
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* not read by general-purpose sessions.

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