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Commitb8e19b9

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Flush logical mapping files with fd opened for read/write at checkpoint
The file descriptor was opened with read-only to fsync a regular file,which would cause EBADFD errors on some platforms.This is similar to the recent fix done bya586cc4 (which was broken byme with82a5649), except that I noticed this issue while monitoring thebackend code for similar mistakes. Backpatch to 9.4, as this has beenintroduced since logical decoding exists as ofb89e151.Author: Michael PaquierReviewed-by: Andres FreundDiscussion:https://postgr.es/m/20191006045548.GA14532@paquier.xyzBackpatch-through: 9.4
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‎src/backend/access/heap/rewriteheap.c

Lines changed: 2 additions & 1 deletion
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@@ -1280,7 +1280,8 @@ CheckPointLogicalRewriteHeap(void)
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}
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else
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{
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intfd=OpenTransientFile(path,O_RDONLY |PG_BINARY);
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/* on some operating systems fsyncing a file requires O_RDWR */
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intfd=OpenTransientFile(path,O_RDWR |PG_BINARY);
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/*
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* The file cannot vanish due to concurrency since this function

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