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added group commit; drastically speeds up mult-threaded synchronous write workloads

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This commit is contained in:
Sanjay Ghemawat
2012-03-08 16:23:21 -08:00
parent 015d26f8be
commit d79762e273
5 changed files with 162 additions and 49 deletions
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17
db/write_batch.cc
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@@ -23,6 +23,9 @@
namespace leveldb {
// WriteBatch header has an 8-byte sequence number followed by a 4-byte count.
static const size_t kHeader = 12;
WriteBatch::WriteBatch() {
Clear();
}
@@ -33,16 +36,16 @@ WriteBatch::Handler::~Handler() { }
void WriteBatch::Clear() {
rep_.clear();
rep_.resize(12);
rep_.resize(kHeader);
}
Status WriteBatch::Iterate(Handler* handler) const {
Slice input(rep_);
if (input.size() < 12) {
if (input.size() < kHeader) {
return Status::Corruption("malformed WriteBatch (too small)");
}
input.remove_prefix(12);
input.remove_prefix(kHeader);
Slice key, value;
int found = 0;
while (!input.empty()) {
@@ -131,8 +134,14 @@ Status WriteBatchInternal::InsertInto(const WriteBatch* b,
}
void WriteBatchInternal::SetContents(WriteBatch* b, const Slice& contents) {
assert(contents.size() >= 12);
assert(contents.size() >= kHeader);
b->rep_.assign(contents.data(), contents.size());
}
void WriteBatchInternal::Append(WriteBatch* dst, const WriteBatch* src) {
SetCount(dst, Count(dst) + Count(src));
assert(src->rep_.size() >= kHeader);
dst->rep_.append(src->rep_.data() + kHeader, src->rep_.size() - kHeader);
}
} // namespace leveldb