Hotfix to keep the Ripple server from having to reprocess ledgers it built locally as a result of its consensus engine. This fix applies to all pre-releases of 0.12, all releases of 0.12, all release candidates of 0.13, and the current develop branch. (Alternatively, you just use JoelKatz/stable-wip, though that branch is not always stable.)

This change seems obviously harmless and seems to obviously correct a bug, but it has not been extensively tested for stability. It should be applied by hand, adding one line to LegerConsensus::accept. Your LedgerConsensus.cpp file may be in a different directory depending on the version of the code you have.

diff --git a/src/ripple_app/consensus/LedgerConsensus.cpp b/src/ripple_app/consensus/LedgerConsensus.cpp
index 9f3b760..11437b4 100644
--- a/src/ripple_app/consensus/LedgerConsensus.cpp
+++ b/src/ripple_app/consensus/LedgerConsensus.cpp
@@ -1268,6 +1268,7 @@ void LedgerConsensus::accept (SHAMap::ref set, LoadEvent::pointer)
         newLCL->setAccepted (closeTime, mCloseResolution, closeTimeCorrect);
         newLCL->updateHash ();
         newLCL->setImmutable ();
+        getApp().getLedgerMaster().storeLedger(newLCL);

         WriteLog (lsDEBUG, LedgerConsensus) << "Report: NewL  = " << newLCL->getHash () << ":" << newLCL->getLedgerSeq ();
         uint256 newLCLHash = newLCL->getHash ();