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Separate messages for standby replies and hot standby feedback.

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Allow messages to be sent at different times, and greatly reduce
the frequency of hot standby feedback. Refactor to allow additional
message types.
This commit is contained in:
Simon Riggs
2011-02-18 11:31:49 +00:00
parent 45a6d79b17
commit 06828c5feb
3 changed files with 170 additions and 77 deletions
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15
src/include/replication/walprotocol.h
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@@ -56,6 +56,18 @@ typedef struct
XLogRecPtr flush;
XLogRecPtr apply;
/* Sender's system clock at the time of transmission */
TimestampTz sendTime;
} StandbyReplyMessage;
/*
* Hot Standby feedback from standby (message type 'h'). This is wrapped within
* a CopyData message at the FE/BE protocol level.
*
* Note that the data length is not specified here.
*/
typedef struct
{
/*
* The current xmin and epoch from the standby, for Hot Standby feedback.
* This may be invalid if the standby-side does not support feedback,
@@ -64,10 +76,9 @@ typedef struct
TransactionId xmin;
uint32 epoch;
/* Sender's system clock at the time of transmission */
TimestampTz sendTime;
} StandbyReplyMessage;
} StandbyHSFeedbackMessage;
/*
* Maximum data payload in a WAL data message. Must be >= XLOG_BLCKSZ.