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Merge pull request #3609 from sipa/limitorphanblocks

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Limit the number of orphan blocks in memory
This commit is contained in:
Gavin Andresen 2014-02-08 10:49:49 -05:00
commit 95e66247eb
2 changed files with 29 additions and 1 deletions
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28
src/main.cpp
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@ -1054,6 +1054,31 @@ uint256 static GetOrphanRoot(const uint256& hash)
} while(true);
}
// Remove a random orphan block (which does not have any dependent orphans).
void static PruneOrphanBlocks()
{
if (mapOrphanBlocksByPrev.size() <= MAX_ORPHAN_BLOCKS)
return;
// Pick a random orphan block.
int pos = insecure_rand() % mapOrphanBlocksByPrev.size();
std::multimap<uint256, COrphanBlock*>::iterator it = mapOrphanBlocksByPrev.begin();
while (pos--) it++;
// As long as this block has other orphans depending on it, move to one of those successors.
do {
std::multimap<uint256, COrphanBlock*>::iterator it2 = mapOrphanBlocksByPrev.find(it->second->hashBlock);
if (it2 == mapOrphanBlocksByPrev.end())
break;
it = it2;
} while(1);
uint256 hash = it->second->hashBlock;
delete it->second;
mapOrphanBlocksByPrev.erase(it);
mapOrphanBlocks.erase(hash);
}
int64_t GetBlockValue(int nHeight, int64_t nFees)
{
int64_t nSubsidy = 50 * COIN;
@ -2373,10 +2398,11 @@ bool ProcessBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, CDiskBl
// If we don't already have its previous block, shunt it off to holding area until we get it
if (pblock->hashPrevBlock != 0 && !mapBlockIndex.count(pblock->hashPrevBlock))
{
LogPrintf("ProcessBlock: ORPHAN BLOCK, prev=%s\n", pblock->hashPrevBlock.ToString());
LogPrintf("ProcessBlock: ORPHAN BLOCK %lu, prev=%s\n", (unsigned long)mapOrphanBlocks.size(), pblock->hashPrevBlock.ToString());
// Accept orphans as long as there is a node to request its parents from
if (pfrom) {
PruneOrphanBlocks();
COrphanBlock* pblock2 = new COrphanBlock();
{
CDataStream ss(SER_DISK, CLIENT_VERSION);

2
src/main.h
View File

@ -45,6 +45,8 @@ static const unsigned int MAX_STANDARD_TX_SIZE = 100000;
static const unsigned int MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50;
/** The maximum number of orphan transactions kept in memory */
static const unsigned int MAX_ORPHAN_TRANSACTIONS = MAX_BLOCK_SIZE/100;
/** The maximum number of orphan blocks kept in memory */
static const unsigned int MAX_ORPHAN_BLOCKS = 750;
/** The maximum size of a blk?????.dat file (since 0.8) */
static const unsigned int MAX_BLOCKFILE_SIZE = 0x8000000; // 128 MiB
/** The pre-allocation chunk size for blk?????.dat files (since 0.8) */