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Diffstat (limited to 'src/backend/access/transam/xlog.c')
| -rw-r--r-- | src/backend/access/transam/xlog.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c index da7b6c2fadd..6cf441534cc 100644 --- a/src/backend/access/transam/xlog.c +++ b/src/backend/access/transam/xlog.c @@ -292,6 +292,14 @@ static TimeLineID curFileTLI; * end+1 of the last record, and is reset when we end a top-level transaction, * or start a new one; so it can be used to tell if the current transaction has * created any XLOG records. + * + * While in parallel mode, this may not be fully up to date. When committing, + * a transaction can assume this covers all xlog records written either by the + * user backend or by any parallel worker which was present at any point during + * the transaction. But when aborting, or when still in parallel mode, other + * parallel backends may have written WAL records at later LSNs than the value + * stored here. The parallel leader advances its own copy, when necessary, + * in WaitForParallelWorkersToFinish. */ static XLogRecPtr ProcLastRecPtr = InvalidXLogRecPtr; |