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Revert "net: Avoid duplicate getheaders requests." PR #8054

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This reverts commit f93c2a1b7e.

This can cause synchronization to get stuck.
This commit is contained in:
Gregory Maxwell 2016-07-05 20:45:14 +00:00
parent 115735d547
commit 4fbdc4365b
1 changed files with 1 additions and 8 deletions
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9
src/main.cpp
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@ -5835,13 +5835,6 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
return true;
}
// If we already know the last header in the message, then it contains
// no new information for us. In this case, we do not request
// more headers later. This prevents multiple chains of redundant
// getheader requests from running in parallel if triggered by incoming
// blocks while the node is still in initial headers sync.
const bool hasNewHeaders = (mapBlockIndex.count(headers.back().GetHash()) == 0);
CBlockIndex *pindexLast = NULL;
BOOST_FOREACH(const CBlockHeader& header, headers) {
CValidationState state;
@ -5862,7 +5855,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
assert(pindexLast);
UpdateBlockAvailability(pfrom->GetId(), pindexLast->GetBlockHash());
if (nCount == MAX_HEADERS_RESULTS && hasNewHeaders) {
if (nCount == MAX_HEADERS_RESULTS) {
// Headers message had its maximum size; the peer may have more headers.
// TODO: optimize: if pindexLast is an ancestor of chainActive.Tip or pindexBestHeader, continue
// from there instead.