Pruning

The blockchain prunes seven eighths of prunable tx data.
This saves about two thirds of the blockchain size, while
keeping the node useful as a sync source for an eighth
of the blockchain.

No other data is currently pruned.

There are three ways to prune a blockchain:

- run monerod with --prune-blockchain
- run "prune_blockchain" in the monerod console
- run the monero-blockchain-prune utility

The first two will prune in place. Due to how LMDB works, this
will not reduce the blockchain size on disk. Instead, it will
mark parts of the file as free, so that future data will use
that free space, causing the file to not grow until free space
grows scarce.

The third way will create a second database, a pruned copy of
the original one. Since this is a new file, this one will be
smaller than the original one.

Once the database is pruned, it will stay pruned as it syncs.
That is, there is no need to use --prune-blockchain again, etc.

1 files changed, 11 insertions, 6 deletions

diff --git a/src/cryptonote_protocol/block_queue.h b/src/cryptonote_protocol/block_queue.h
index 9cce95075..c7d3af7ac 100644
--- a/src/cryptonote_protocol/block_queue.h
+++ b/src/cryptonote_protocol/block_queue.h
@@ -76,22 +76,26 @@ namespace cryptonote
     void remove_spans(const boost::uuids::uuid &connection_id, uint64_t start_block_height);
     uint64_t get_max_block_height() const;
     void print() const;
-    std::string get_overview() const;
-    std::pair<uint64_t, uint64_t> reserve_span(uint64_t first_block_height, uint64_t last_block_height, uint64_t max_blocks, const boost::uuids::uuid &connection_id, const std::vector<crypto::hash> &block_hashes, boost::posix_time::ptime time = boost::posix_time::microsec_clock::universal_time());
-    bool is_blockchain_placeholder(const span &span) const;
-    std::pair<uint64_t, uint64_t> get_start_gap_span() const;
+    std::string get_overview(uint64_t blockchain_height) const;
+    bool has_unpruned_height(uint64_t block_height, uint64_t blockchain_height, uint32_t pruning_seed) const;
+    std::pair<uint64_t, uint64_t> reserve_span(uint64_t first_block_height, uint64_t last_block_height, uint64_t max_blocks, const boost::uuids::uuid &connection_id, uint32_t pruning_seed, uint64_t blockchain_height, const std::vector<crypto::hash> &block_hashes, boost::posix_time::ptime time = boost::posix_time::microsec_clock::universal_time());
+    uint64_t get_next_needed_height(uint64_t blockchain_height) const;
     std::pair<uint64_t, uint64_t> get_next_span_if_scheduled(std::vector<crypto::hash> &hashes, boost::uuids::uuid &connection_id, boost::posix_time::ptime &time) const;
+    void reset_next_span_time(boost::posix_time::ptime t = boost::posix_time::microsec_clock::universal_time());
     void set_span_hashes(uint64_t start_height, const boost::uuids::uuid &connection_id, std::vector<crypto::hash> hashes);
     bool get_next_span(uint64_t &height, std::vector<cryptonote::block_complete_entry> &bcel, boost::uuids::uuid &connection_id, bool filled = true) const;
-    bool has_next_span(const boost::uuids::uuid &connection_id, bool &filled) const;
+    bool has_next_span(const boost::uuids::uuid &connection_id, bool &filled, boost::posix_time::ptime &time) const;
+    bool has_next_span(uint64_t height, bool &filled, boost::posix_time::ptime &time, boost::uuids::uuid &connection_id) const;
     size_t get_data_size() const;
     size_t get_num_filled_spans_prefix() const;
     size_t get_num_filled_spans() const;
     crypto::hash get_last_known_hash(const boost::uuids::uuid &connection_id) const;
     bool has_spans(const boost::uuids::uuid &connection_id) const;
     float get_speed(const boost::uuids::uuid &connection_id) const;
-    bool foreach(std::function<bool(const span&)> f, bool include_blockchain_placeholder = false) const;
+    float get_download_rate(const boost::uuids::uuid &connection_id) const;
+    bool foreach(std::function<bool(const span&)> f) const;
     bool requested(const crypto::hash &hash) const;
+    bool have(const crypto::hash &hash) const;
 
   private:
     void erase_block(block_map::iterator j);
@@ -101,5 +105,6 @@ namespace cryptonote
     block_map blocks;
     mutable boost::recursive_mutex mutex;
     std::unordered_set<crypto::hash> requested_hashes;
+    std::unordered_set<crypto::hash> have_blocks;
   };
 }