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Add information of total data processed to replication slot stats.

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This adds the statistics about total transactions count and total
transaction data logically sent to the decoding output plugin from
ReorderBuffer. Users can query the pg_stat_replication_slots view to check
these stats.

Suggested-by: Andres Freund
Author: Vignesh C and Amit Kapila
Reviewed-by: Sawada Masahiko, Amit Kapila
Discussion: https://postgr.es/m/20210319185247.ldebgpdaxsowiflw@alap3.anarazel.de
This commit is contained in:
Amit Kapila
2021-04-16 07:34:43 +05:30
parent 1bf946bd43
commit f5fc2f5b23
15 changed files with 256 additions and 52 deletions
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21
src/backend/replication/logical/reorderbuffer.c
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@ -350,6 +350,8 @@ ReorderBufferAllocate(void)
buffer->streamTxns = 0;
buffer->streamCount = 0;
buffer->streamBytes = 0;
buffer->totalTxns = 0;
buffer->totalBytes = 0;
buffer->current_restart_decoding_lsn = InvalidXLogRecPtr;
@ -1363,6 +1365,11 @@ ReorderBufferIterTXNNext(ReorderBuffer *rb, ReorderBufferIterTXNState *state)
dlist_delete(&change->node);
dlist_push_tail(&state->old_change, &change->node);
/*
* Update the total bytes processed before releasing the current set
* of changes and restoring the new set of changes.
*/
rb->totalBytes += rb->size;
if (ReorderBufferRestoreChanges(rb, entry->txn, &entry->file,
&state->entries[off].segno))
{
@ -2363,6 +2370,20 @@ ReorderBufferProcessTXN(ReorderBuffer *rb, ReorderBufferTXN *txn,
ReorderBufferIterTXNFinish(rb, iterstate);
iterstate = NULL;
/*
* Update total transaction count and total transaction bytes
* processed. Ensure to not count the streamed transaction multiple
* times.
*
* Note that the statistics computation has to be done after
* ReorderBufferIterTXNFinish as it releases the serialized change
* which we have already accounted in ReorderBufferIterTXNNext.
*/
if (!rbtxn_is_streamed(txn))
rb->totalTxns++;
rb->totalBytes += rb->size;
/*
* Done with current changes, send the last message for this set of
* changes depending upon streaming mode.