atomic flush_dbs
This commit is contained in:
Jack Robison
parent
cf5dba9157
commit
9f224a971b
2 changed files with 134 additions and 112 deletions
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@ -2,14 +2,17 @@ import time
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import asyncio
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from struct import pack, unpack
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from concurrent.futures.thread import ThreadPoolExecutor
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from typing import Optional
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from typing import Optional, List, Tuple
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from prometheus_client import Gauge, Histogram
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import lbry
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from lbry.schema.claim import Claim
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from lbry.wallet.server.tx import Tx
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from lbry.wallet.server.db.writer import SQLDB
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from lbry.wallet.server.daemon import DaemonError
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from lbry.wallet.server.hash import hash_to_hex_str, HASHX_LEN
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from lbry.wallet.server.util import chunks, class_logger
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from lbry.wallet.server.leveldb import FlushData
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from lbry.wallet.transaction import Transaction
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from lbry.wallet.server.udp import StatusServer
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@ -212,15 +215,15 @@ class BlockProcessor:
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chain = [self.tip] + [self.coin.header_hash(h) for h in headers[:-1]]
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if hprevs == chain:
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start = time.perf_counter()
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await self.run_in_thread_with_lock(self.advance_blocks, blocks)
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if self.sql:
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await self.db.search_index.claim_consumer(self.sql.claim_producer())
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for cache in self.search_cache.values():
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cache.clear()
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self.history_cache.clear()
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self.history_cache.clear() # TODO: is this needed?
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self.notifications.notified_mempool_txs.clear()
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await self._maybe_flush()
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processed_time = time.perf_counter() - start
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self.block_count_metric.set(self.height)
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self.block_update_time_metric.observe(processed_time)
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@ -423,7 +426,14 @@ class BlockProcessor:
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self.headers.extend(headers)
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self.tip = self.coin.header_hash(headers[-1])
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def advance_txs(self, height, txs, header, block_hash):
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self.db.flush_dbs(self.flush_data(), True, self.estimate_txs_remaining)
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for cache in self.search_cache.values():
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cache.clear()
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self.history_cache.clear()
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self.notifications.notified_mempool_txs.clear()
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def advance_txs(self, height, txs: List[Tuple[Tx, bytes]], header, block_hash):
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self.block_hashes.append(block_hash)
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self.block_txs.append((b''.join(tx_hash for tx, tx_hash in txs), [tx.raw for tx, _ in txs]))
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@ -611,7 +621,6 @@ class BlockProcessor:
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for hdb_key, hashX in candidates.items():
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tx_num_packed = hdb_key[-4:]
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if len(candidates) > 1:
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tx_num, = unpack('<I', tx_num_packed)
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try:
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hash, height = self.db.fs_tx_hash(tx_num)
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@ -635,6 +644,7 @@ class BlockProcessor:
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# Remove both entries for this UTXO
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self.db_deletes.append(hdb_key)
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self.db_deletes.append(udb_key)
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return hashX + tx_num_packed + utxo_value_packed
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self.logger.error('UTXO {hash_to_hex_str(tx_hash)} / {tx_idx} not found in "h" table')
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@ -29,25 +29,26 @@ from lbry.utils import LRUCacheWithMetrics
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from lbry.wallet.server import util
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from lbry.wallet.server.hash import hash_to_hex_str, HASHX_LEN
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from lbry.wallet.server.merkle import Merkle, MerkleCache
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from lbry.wallet.server.util import formatted_time
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from lbry.wallet.server.util import formatted_time, pack_be_uint16
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from lbry.wallet.server.storage import db_class
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from lbry.wallet.server.history import History
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UTXO = namedtuple("UTXO", "tx_num tx_pos tx_hash height value")
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HISTORY_PREFIX = b'A'
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TX_PREFIX = b'B'
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BLOCK_HASH_PREFIX = b'C'
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HEADER_PREFIX = b'H'
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TX_NUM_PREFIX = b'N'
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TX_COUNT_PREFIX = b'T'
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TX_HASH_PREFIX = b'X'
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TX_PREFIX = b'B'
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TX_NUM_PREFIX = b'N'
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BLOCK_HASH_PREFIX = b'C'
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HISTORY_PREFIX = b'A'
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HASHX_UTXO_PREFIX = b'h'
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HIST_STATE = b'state-hist'
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UTXO_STATE = b'state-utxo'
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UTXO_PREFIX = b'u'
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HASHX_HISTORY_PREFIX = b'x'
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UTXO_STATE = b'state-utxo'
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HIST_STATE = b'state-hist'
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@ -241,106 +242,6 @@ class LevelDB:
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assert not flush_data.undo_infos
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self.history.assert_flushed()
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def flush_dbs(self, flush_data, flush_utxos, estimate_txs_remaining):
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"""Flush out cached state. History is always flushed; UTXOs are
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flushed if flush_utxos."""
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if flush_data.height == self.db_height:
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self.assert_flushed(flush_data)
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return
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start_time = time.time()
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prior_flush = self.last_flush
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tx_delta = flush_data.tx_count - self.last_flush_tx_count
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# Flush to file system
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self.flush_fs(flush_data)
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# Then history
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self.flush_history()
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# Flush state last as it reads the wall time.
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with self.db.write_batch() as batch:
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if flush_utxos:
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self.flush_utxo_db(batch, flush_data)
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self.flush_state(batch)
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# Update and put the wall time again - otherwise we drop the
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# time it took to commit the batch
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self.flush_state(self.db)
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elapsed = self.last_flush - start_time
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self.logger.info(f'flush #{self.history.flush_count:,d} took '
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f'{elapsed:.1f}s. Height {flush_data.height:,d} '
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f'txs: {flush_data.tx_count:,d} ({tx_delta:+,d})')
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# Catch-up stats
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if self.db.for_sync:
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flush_interval = self.last_flush - prior_flush
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tx_per_sec_gen = int(flush_data.tx_count / self.wall_time)
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tx_per_sec_last = 1 + int(tx_delta / flush_interval)
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eta = estimate_txs_remaining() / tx_per_sec_last
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self.logger.info(f'tx/sec since genesis: {tx_per_sec_gen:,d}, '
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f'since last flush: {tx_per_sec_last:,d}')
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self.logger.info(f'sync time: {formatted_time(self.wall_time)} '
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f'ETA: {formatted_time(eta)}')
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def flush_fs(self, flush_data):
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"""Write headers, tx counts and block tx hashes to the filesystem.
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The first height to write is self.fs_height + 1. The FS
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metadata is all append-only, so in a crash we just pick up
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again from the height stored in the DB.
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"""
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prior_tx_count = (self.tx_counts[self.fs_height]
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if self.fs_height >= 0 else 0)
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assert len(flush_data.block_txs) == len(flush_data.headers)
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assert flush_data.height == self.fs_height + len(flush_data.headers)
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assert flush_data.tx_count == (self.tx_counts[-1] if self.tx_counts
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else 0)
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assert len(self.tx_counts) == flush_data.height + 1
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assert len(
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b''.join(hashes for hashes, _ in flush_data.block_txs)
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) // 32 == flush_data.tx_count - prior_tx_count
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# Write the headers
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start_time = time.perf_counter()
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with self.db.write_batch() as batch:
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batch_put = batch.put
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for i, header in enumerate(flush_data.headers):
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batch_put(HEADER_PREFIX + util.pack_be_uint64(self.fs_height + i + 1), header)
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self.headers.append(header)
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flush_data.headers.clear()
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height_start = self.fs_height + 1
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tx_num = prior_tx_count
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with self.db.write_batch() as batch:
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batch_put = batch.put
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for block_hash, (tx_hashes, txs) in zip(flush_data.block_hashes, flush_data.block_txs):
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tx_count = self.tx_counts[height_start]
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batch_put(BLOCK_HASH_PREFIX + util.pack_be_uint64(height_start), block_hash[::-1])
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batch_put(TX_COUNT_PREFIX + util.pack_be_uint64(height_start), util.pack_be_uint64(tx_count))
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height_start += 1
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offset = 0
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while offset < len(tx_hashes):
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batch_put(TX_HASH_PREFIX + util.pack_be_uint64(tx_num), tx_hashes[offset:offset+32])
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batch_put(TX_NUM_PREFIX + tx_hashes[offset:offset+32], util.pack_be_uint64(tx_num))
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batch_put(TX_PREFIX + tx_hashes[offset:offset+32], txs[offset // 32])
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tx_num += 1
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offset += 32
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flush_data.block_txs.clear()
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flush_data.block_hashes.clear()
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self.fs_height = flush_data.height
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self.fs_tx_count = flush_data.tx_count
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elapsed = time.perf_counter() - start_time
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self.logger.info(f'flushed filesystem data in {elapsed:.2f}s')
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def flush_history(self):
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self.history.flush()
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def flush_utxo_db(self, batch, flush_data):
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"""Flush the cached DB writes and UTXO set to the batch."""
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# Care is needed because the writes generated by flushing the
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@ -384,6 +285,117 @@ class LevelDB:
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self.db_tx_count = flush_data.tx_count
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self.db_tip = flush_data.tip
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def flush_dbs(self, flush_data, flush_utxos, estimate_txs_remaining):
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"""Flush out cached state. History is always flushed; UTXOs are
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flushed if flush_utxos."""
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if flush_data.height == self.db_height:
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self.assert_flushed(flush_data)
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return
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start_time = time.time()
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prior_flush = self.last_flush
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tx_delta = flush_data.tx_count - self.last_flush_tx_count
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# Flush to file system
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# self.flush_fs(flush_data)
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prior_tx_count = (self.tx_counts[self.fs_height]
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if self.fs_height >= 0 else 0)
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assert len(flush_data.block_txs) == len(flush_data.headers)
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assert flush_data.height == self.fs_height + len(flush_data.headers)
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assert flush_data.tx_count == (self.tx_counts[-1] if self.tx_counts
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else 0)
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assert len(self.tx_counts) == flush_data.height + 1
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assert len(
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b''.join(hashes for hashes, _ in flush_data.block_txs)
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) // 32 == flush_data.tx_count - prior_tx_count
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# Write the headers
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start_time = time.perf_counter()
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with self.db.write_batch() as batch:
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batch_put = batch.put
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height_start = self.fs_height + 1
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tx_num = prior_tx_count
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for i, (header, block_hash, (tx_hashes, txs)) in enumerate(zip(flush_data.headers, flush_data.block_hashes, flush_data.block_txs)):
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batch_put(HEADER_PREFIX + util.pack_be_uint64(height_start), header)
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self.headers.append(header)
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tx_count = self.tx_counts[height_start]
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batch_put(BLOCK_HASH_PREFIX + util.pack_be_uint64(height_start), block_hash[::-1])
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batch_put(TX_COUNT_PREFIX + util.pack_be_uint64(height_start), util.pack_be_uint64(tx_count))
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height_start += 1
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offset = 0
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while offset < len(tx_hashes):
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batch_put(TX_HASH_PREFIX + util.pack_be_uint64(tx_num), tx_hashes[offset:offset + 32])
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batch_put(TX_NUM_PREFIX + tx_hashes[offset:offset + 32], util.pack_be_uint64(tx_num))
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batch_put(TX_PREFIX + tx_hashes[offset:offset + 32], txs[offset // 32])
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tx_num += 1
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offset += 32
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flush_data.headers.clear()
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flush_data.block_txs.clear()
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flush_data.block_hashes.clear()
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# flush_data.claim_txo_cache.clear()
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# flush_data.support_txo_cache.clear()
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self.fs_height = flush_data.height
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self.fs_tx_count = flush_data.tx_count
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# Then history
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self.history.flush_count += 1
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flush_id = pack_be_uint16(self.history.flush_count)
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unflushed = self.history.unflushed
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for hashX in sorted(unflushed):
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key = hashX + flush_id
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batch_put(HASHX_HISTORY_PREFIX + key, unflushed[hashX].tobytes())
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self.history.write_state(batch)
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unflushed.clear()
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self.history.unflushed_count = 0
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#########################
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# Flush state last as it reads the wall time.
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if flush_utxos:
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self.flush_utxo_db(batch, flush_data)
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# self.flush_state(batch)
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#
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now = time.time()
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self.wall_time += now - self.last_flush
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self.last_flush = now
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self.last_flush_tx_count = self.fs_tx_count
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self.write_utxo_state(batch)
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# # Update and put the wall time again - otherwise we drop the
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# # time it took to commit the batch
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# # self.flush_state(self.db)
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# now = time.time()
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# self.wall_time += now - self.last_flush
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# self.last_flush = now
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# self.last_flush_tx_count = self.fs_tx_count
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# self.write_utxo_state(batch)
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elapsed = self.last_flush - start_time
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self.logger.info(f'flush #{self.history.flush_count:,d} took '
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f'{elapsed:.1f}s. Height {flush_data.height:,d} '
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f'txs: {flush_data.tx_count:,d} ({tx_delta:+,d})')
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# Catch-up stats
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if self.db.for_sync:
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flush_interval = self.last_flush - prior_flush
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tx_per_sec_gen = int(flush_data.tx_count / self.wall_time)
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tx_per_sec_last = 1 + int(tx_delta / flush_interval)
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eta = estimate_txs_remaining() / tx_per_sec_last
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self.logger.info(f'tx/sec since genesis: {tx_per_sec_gen:,d}, '
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f'since last flush: {tx_per_sec_last:,d}')
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self.logger.info(f'sync time: {formatted_time(self.wall_time)} '
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f'ETA: {formatted_time(eta)}')
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def flush_state(self, batch):
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"""Flush chain state to the batch."""
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now = time.time()
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