Merge #16171: Remove -mempoolreplacement to prevent needless block prop slowness.

8053e5cdad Remove -mempoolreplacement to prevent needless block prop slowness. (Matt Corallo)

Pull request description:

  At this point there is no reasonable excuse to disable opt-in RBF,
  and, unlike when this option was added, there are now significant
  issues created when disabling it (in the form of compact block
  reconstruction failures). Further, it breaks a lot of modern wallet
  behavior.

  This removes an option that is:

  * (a) only useful when a large portion of (other) miners enforce it as well
  * (b) is detrimental to everyone (income for miners, RBF notifications for others) who uses it individually otherwise
  * (c) is effectively unused
  * (d) is often confused with disabling RBF (rather than just remaining stubbornly unaware of it while the rest of the network lets it through)

ACKs for commit 8053e5:
  practicalswift:
    utACK 8053e5cdade87550f0381d51feab81dedfec6c46
  promag:
    Deprecation would save from unlikely rantings, still ACK 8053e5c.
  jtimon:
    utACK 8053e5cdade87550f0381d51feab81dedfec6c46
  ajtowns:
    ACK 8053e5cdade87550f0381d51feab81dedfec6c46 -- quick code review, checked tests work
  MarcoFalke:
    ACK 8053e5cdade87550f0381d51feab81dedfec6c46

Tree-SHA512: 01aee8905b2487fc38a3a86649d422d2d2345bc60f878889ebda4b8680783e1f1a97c2000c27ef086719501be2abc2911b2039a259a5e5c04f3b24ff02b0427e

1 files changed, 4 insertions, 8 deletions

diff --git a/src/validation.cpp b/src/validation.cpp
index b2925efe3..3026df34f 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -111,7 +111,6 @@ bool fCheckpointsEnabled = DEFAULT_CHECKPOINTS_ENABLED;
 size_t nCoinCacheUsage = 5000 * 300;
 uint64_t nPruneTarget = 0;
 int64_t nMaxTipAge = DEFAULT_MAX_TIP_AGE;
-bool fEnableReplacement = DEFAULT_ENABLE_REPLACEMENT;
 
 uint256 hashAssumeValid;
 arith_uint256 nMinimumChainWork;
@@ -486,15 +485,12 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
                 // unconfirmed ancestors anyway; doing otherwise is hopelessly
                 // insecure.
                 bool fReplacementOptOut = true;
-                if (fEnableReplacement)
+                for (const CTxIn &_txin : ptxConflicting->vin)
                 {
-                    for (const CTxIn &_txin : ptxConflicting->vin)
+                    if (_txin.nSequence <= MAX_BIP125_RBF_SEQUENCE)
                     {
-                        if (_txin.nSequence <= MAX_BIP125_RBF_SEQUENCE)
-                        {
-                            fReplacementOptOut = false;
-                            break;
-                        }
+                        fReplacementOptOut = false;
+                        break;
                     }
                 }
                 if (fReplacementOptOut) {