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Track statistics for spilling of changes from ReorderBuffer.

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This adds the statistics about transactions spilled to disk from
ReorderBuffer.  Users can query the pg_stat_replication view to check
these stats.

Author: Tomas Vondra, with bug-fixes and minor changes by Dilip Kumar
Reviewed-by: Amit Kapila
Discussion: https://postgr.es/m/688b0b7f-2f6c-d827-c27b-216a8e3ea700@2ndquadrant.com
This commit is contained in:
Amit Kapila
2019-11-16 18:24:00 +05:30
parent 168d206400
commit 9290ad198b
9 changed files with 101 additions and 9 deletions
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12
src/backend/replication/logical/reorderbuffer.c
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@@ -308,6 +308,10 @@ ReorderBufferAllocate(void)
buffer->outbufsize = 0;
buffer->size = 0;
buffer->spillCount = 0;
buffer->spillTxns = 0;
buffer->spillBytes = 0;
buffer->current_restart_decoding_lsn = InvalidXLogRecPtr;
dlist_init(&buffer->toplevel_by_lsn);
@@ -2415,6 +2419,7 @@ ReorderBufferSerializeTXN(ReorderBuffer *rb, ReorderBufferTXN *txn)
int fd = -1;
XLogSegNo curOpenSegNo = 0;
Size spilled = 0;
Size size = txn->size;
elog(DEBUG2, "spill %u changes in XID %u to disk",
(uint32) txn->nentries_mem, txn->xid);
@@ -2473,6 +2478,13 @@ ReorderBufferSerializeTXN(ReorderBuffer *rb, ReorderBufferTXN *txn)
spilled++;
}
/* update the statistics */
rb->spillCount += 1;
rb->spillBytes += size;
/* Don't consider already serialized transaction. */
rb->spillTxns += txn->serialized ? 0 : 1;
Assert(spilled == txn->nentries_mem);
Assert(dlist_is_empty(&txn->changes));
txn->nentries_mem = 0;