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Fix parallel query on standby servers.

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Without this fix, it inevitably bombs out with "ERROR:  failed to
initialize transaction_read_only to 0".  Repair.

Ashutosh Sharma; comments adjusted by me.
This commit is contained in:
Robert Haas 2016-03-08 10:27:03 -05:00
parent 070140ee48
commit dcfecaae9e
1 changed files with 3 additions and 1 deletions
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4
src/backend/commands/variable.c
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@ -482,11 +482,13 @@ show_log_timezone(void)
* nothing since XactReadOnly will be reset by the next StartTransaction(). * nothing since XactReadOnly will be reset by the next StartTransaction().
* The IsTransactionState() test protects us against trying to check * The IsTransactionState() test protects us against trying to check
* RecoveryInProgress() in contexts where shared memory is not accessible. * RecoveryInProgress() in contexts where shared memory is not accessible.
* (Similarly, if we're restoring state in a parallel worker, just allow
* the change.)
*/ */
bool bool
check_transaction_read_only(bool *newval, void **extra, GucSource source) check_transaction_read_only(bool *newval, void **extra, GucSource source)
{ {
if (*newval == false && XactReadOnly && IsTransactionState()) if (*newval == false && XactReadOnly && IsTransactionState() && !InitializingParallelWorker)
{ {
/* Can't go to r/w mode inside a r/o transaction */ /* Can't go to r/w mode inside a r/o transaction */
if (IsSubTransaction()) if (IsSubTransaction())