+struct ShardData {
+ vector<Element> elems;
+ unique_ptr<Arena> arena; // Used to allocate bpfen.
+ int num_written_subshards = 0;
+};
+
+void write_subshard(const char *basename, ShardData* shard, int bucket)
+{
+ string buf; // Keep allocated.
+ char filename[256];
+ snprintf(filename, sizeof(filename), "%s.part%04d.subshard%04d",
+ basename, bucket, shard->num_written_subshards++);
+ printf("Writing SSTable %s...\n", filename);
+
+ sort(shard->elems.begin(), shard->elems.end());
+
+ mtbl_writer_options* wopt = mtbl_writer_options_init();
+ mtbl_writer_options_set_compression(wopt, MTBL_COMPRESSION_SNAPPY);
+ mtbl_writer* mtbl = mtbl_writer_init(filename, wopt);
+ Count c;
+ unordered_set<string> moves;
+ for (size_t i = 0; i < shard->elems.size(); ++i) {
+ const Element &e = shard->elems[i];
+ if (e.result == WHITE) {
+ c.set_white(c.white() + 1);
+ } else if (e.result == DRAW) {
+ c.set_draw(c.draw() + 1);
+ } else if (e.result == BLACK) {
+ c.set_black(c.black() + 1);
+ }
+ if (e.white_elo >= 100 && e.black_elo >= 100) {
+ c.set_sum_white_elo(c.sum_white_elo() + e.white_elo);
+ c.set_sum_black_elo(c.sum_black_elo() + e.black_elo);
+ c.set_num_elo(c.num_elo() + 1);
+ }
+ if (!c.has_first_timestamp() || e.timestamp < c.first_timestamp()) {
+ if (e.timestamp != DUMMY_TIMESTAMP) {
+ c.set_first_timestamp(e.timestamp);
+ }
+ c.set_opening_num(e.opening_num);
+ c.set_pgn_file_num(e.file_num);
+ c.set_pgn_start_position(e.start_position);
+ }
+ if (!moves.count(e.move)) {
+ moves.insert(e.move);
+ c.add_move(e.move);
+ }
+ if (i == shard->elems.size() - 1 ||
+ e.bpfen_len != shard->elems[i + 1].bpfen_len ||
+ memcmp(e.bpfen, shard->elems[i + 1].bpfen, e.bpfen_len) != 0) {
+ c.SerializeToString(&buf);
+ mtbl_writer_add(mtbl,
+ (const uint8_t *)e.bpfen, e.bpfen_len,
+ (const uint8_t *)buf.data(), buf.size());
+ c = Count();
+ moves.clear();
+ }
+ }
+ mtbl_writer_destroy(&mtbl);
+
+ shard->elems.clear();
+ shard->arena.reset(new Arena);
+}
+