src/gausskernel/storage/access/transam/xact.cpp

@@ -8094,8 +8094,13 @@ CommitSeqNo SetXact2CommitInProgress(TransactionId xid, CommitSeqNo csn)
         return InvalidCommitSeqNo;
 
     nchildren = xactGetCommittedChildren(&children);
+    // get the number of subTransaction.
     CSNLogSetCommitSeqNo(xid, nchildren, children, COMMITSEQNO_COMMIT_INPROGRESS | latestCSN);
-
+    /*
+     * Record the status and CSN of transaction entries in the transaction commit log of the
+     * transaction and its child transaction tree. Be careful to ensure that this operation * is as efficient and atomic
+     * as possible..
+     */
     ereport(
         DEBUG1, (errmsg("Set %lu to commit in progress, latest csn is %lu", xid, latestCSN)));
     return latestCSN;