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Commitf7b0d07

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Fix timestamp of sent message for write context in logical decoding
When sending data for logical decoding using the streaming replicationprotocol via a WAL sender, the timestamp of the sent write message isallocated at the beginning of the message when preparing for the write,and actually computed when the write message is ready to be sent.The timestamp was getting computed after sending the message. Thisimpacts anything using logical decoding, causing for example logicalreplication to report mostly NULL for last_msg_send_time inpg_stat_subscription.This commit makes sure that the timestamp is computed before sending themessage. This is wrong since5a991ef, so backpatch down to 9.4.Author: Jeff JanesDiscussion:https://postgr.es/m/CAMkU=1z=WMn8jt7iEdC5sYNaPgAgOASb_OW5JYv-vMdYaJSL-w@mail.gmail.comBackpatch-through: 9.4
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‎src/backend/replication/walsender.c

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1157,9 +1157,6 @@ WalSndWriteData(LogicalDecodingContext *ctx, XLogRecPtr lsn, TransactionId xid,
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{
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TimestampTznow;
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1160-
/* output previously gathered data in a CopyData packet */
1161-
pq_putmessage_noblock('d',ctx->out->data,ctx->out->len);
1162-
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/*
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* Fill the send timestamp last, so that it is taken as late as possible.
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* This is somewhat ugly, but the protocol is set as it's already used for
@@ -1171,6 +1168,9 @@ WalSndWriteData(LogicalDecodingContext *ctx, XLogRecPtr lsn, TransactionId xid,
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memcpy(&ctx->out->data[1+sizeof(int64)+sizeof(int64)],
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tmpbuf.data,sizeof(int64));
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1171+
/* output previously gathered data in a CopyData packet */
1172+
pq_putmessage_noblock('d',ctx->out->data,ctx->out->len);
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CHECK_FOR_INTERRUPTS();
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/* Try to flush pending output to the client */

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