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Lag tracking for logical replication

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Lag tracking is called for each commit, but we introduce
a pacing delay to ensure we don't swamp the lag tracker.

Author: Petr Jelinek, with minor pacing delay code from me
This commit is contained in:
Simon Riggs
2017-05-12 10:50:56 +01:00
parent efa2c18f4e
commit 024711bb54
7 changed files with 79 additions and 23 deletions
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15
src/include/replication/logical.h
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@@ -26,6 +26,12 @@ typedef void (*LogicalOutputPluginWriterWrite) (
typedef LogicalOutputPluginWriterWrite LogicalOutputPluginWriterPrepareWrite;
typedef void (*LogicalOutputPluginWriterUpdateProgress) (
struct LogicalDecodingContext *lr,
XLogRecPtr Ptr,
TransactionId xid
);
typedef struct LogicalDecodingContext
{
/* memory context this is all allocated in */
@@ -52,6 +58,7 @@ typedef struct LogicalDecodingContext
*/
LogicalOutputPluginWriterPrepareWrite prepare_write;
LogicalOutputPluginWriterWrite write;
LogicalOutputPluginWriterUpdateProgress update_progress;
/*
* Output buffer.
@@ -85,13 +92,15 @@ extern LogicalDecodingContext *CreateInitDecodingContext(char *plugin,
bool need_full_snapshot,
XLogPageReadCB read_page,
LogicalOutputPluginWriterPrepareWrite prepare_write,
LogicalOutputPluginWriterWrite do_write);
LogicalOutputPluginWriterWrite do_write,
LogicalOutputPluginWriterUpdateProgress update_progress);
extern LogicalDecodingContext *CreateDecodingContext(
XLogRecPtr start_lsn,
List *output_plugin_options,
XLogPageReadCB read_page,
LogicalOutputPluginWriterPrepareWrite prepare_write,
LogicalOutputPluginWriterWrite do_write);
LogicalOutputPluginWriterWrite do_write,
LogicalOutputPluginWriterUpdateProgress update_progress);
extern void DecodingContextFindStartpoint(LogicalDecodingContext *ctx);
extern bool DecodingContextReady(LogicalDecodingContext *ctx);
extern void FreeDecodingContext(LogicalDecodingContext *ctx);
@@ -101,8 +110,6 @@ extern void LogicalIncreaseRestartDecodingForSlot(XLogRecPtr current_lsn,
XLogRecPtr restart_lsn);
extern void LogicalConfirmReceivedLocation(XLogRecPtr lsn);
extern void LagTrackerWrite(XLogRecPtr lsn, TimestampTz local_flush_time);
extern bool filter_by_origin_cb_wrapper(LogicalDecodingContext *ctx, RepOriginId origin_id);
#endif