2024/08/20-07:13:14.512802 140500565382720 DEBG dcompact_worker.cpp:2211: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00: fork to child time = 0.033799 sec 2024/08/20-07:13:14.513749 140500565382720 DEBG dcompact_worker.cpp:1011: Beg SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00 2024/08/20-07:13:14.519316 140500565382720 DEBG dcompact_worker.cpp:1031: End SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00 2024/08/20-07:13:14.521687 140500565382720 TRAC dcompact_worker.cpp:1081: INFO_LOG_LEVEL: rpc = INFO_LEVEL, env_var = undefined 2024/08/20-07:13:14.522037 140500565382720 [WARN] [column_family.cc:386] multiple cf_paths/db_paths and level_compaction_dynamic_level_bytes can't be used together 2024/08/20-07:13:14.573516 140500565382720 [version_set.cc:6139] Recovering from manifest file: /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-20T02.42.00/.rocksdb/job-14884/att-00/MANIFEST-14629260 2024/08/20-07:13:14.590024 140500565382720 [version_set.cc:6182] Recovered from manifest file:/worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-20T02.42.00/.rocksdb/job-14884/att-00/MANIFEST-14629260 succeeded,manifest_file_number is 14629260, next_file_number is 14646185, last_sequence is 190165865178, log_number is 0,prev_log_number is 0,max_column_family is 0,min_log_number_to_keep is 14646026 2024/08/20-07:13:14.590031 140500565382720 [version_set.cc:6197] Column family [default] (ID 0), log number is 0 2024/08/20-07:13:14.590092 140500565382720 [version_set.cc:5652] Creating manifest 14646185 2024/08/20-07:13:14.618061 140500565382720 DEBG dcompact_worker.cpp:1215: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00: bottommost_level: fake = 1, rpc = 0 2024/08/20-07:13:14.631904 140500565382720 [compaction_job.cc:2433] [default] [JOB 14884] Compacting 1@2 + 2@3 files to L3, score 0.98, subcompactions 1 : 1 2024/08/20-07:13:14.631916 140500565382720 [compaction_job.cc:2441] [default]: Compaction start summary: Base version 7654 Base level 2, inputs: [14646161(21MB)], [14646108(97MB) 14646109(42MB)] 2024/08/20-07:13:14.897028 140500565382720 [top_zip_table.cc:59] core git_version_hash_info_is:commit 7517bad5c1a147474c3830831b9a22c996321ae8 Author: leipeng Date: 2024-01-08 19:18:17 +0800 vfork_cmd: call close before wait_finish g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. INCS = -Isrc -I3rdparty/re2 -I3rdparty/zstd -Iboost-include CXXFLAGS = -D TOPLING_IO_WITH_URING=1 -fPIC -time -Wno-class-memaccess -fdiagnostics-color -Wformat=2 -Wcomment -Wall -Wextra -Wno-unused-parameter -Wno-alloc-size-larger-than -mcx16 -Wno-deprecated-declarations -Wstrict-aliasing=3 -DCLIENT_LICENSE_ID="public" -DNO_THREADS -ftls-model=initial-exec -DDIVSUFSORT_API= -fno-stack-protector RLS_FLAGS = -O3 -DNDEBUG -g3 WITH_BMI2 = 1 compile_cpu_flag: -march=haswell -mbmi -mbmi2 2024/08/20-07:13:14.897052 140500565382720 [top_zip_table.cc:60] fsa git_version_hash_info_is:commit 7517bad5c1a147474c3830831b9a22c996321ae8 Author: leipeng Date: 2024-01-08 19:18:17 +0800 vfork_cmd: call close before wait_finish g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. INCS = -Isrc -I3rdparty/re2 -I3rdparty/zstd -Iboost-include CXXFLAGS = -D TOPLING_IO_WITH_URING=1 -fPIC -time -Wno-class-memaccess -fdiagnostics-color -Wformat=2 -Wcomment -Wall -Wextra -Wno-unused-parameter -Wno-alloc-size-larger-than -mcx16 -Wno-deprecated-declarations -Wstrict-aliasing=3 -DCLIENT_LICENSE_ID="public" -DNO_THREADS -ftls-model=initial-exec -DDIVSUFSORT_API= -fno-stack-protector RLS_FLAGS = -O3 -DNDEBUG -g3 WITH_BMI2 = 1 compile_cpu_flag: -march=haswell -mbmi -mbmi2 2024/08/20-07:13:14.897076 140500565382720 [top_zip_table.cc:61] zbs git_version_hash_info_is:commit 7517bad5c1a147474c3830831b9a22c996321ae8 Author: leipeng Date: 2024-01-08 19:18:17 +0800 vfork_cmd: call close before wait_finish g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. INCS = -Isrc -I3rdparty/re2 -I3rdparty/zstd -Iboost-include CXXFLAGS = -D TOPLING_IO_WITH_URING=1 -fPIC -time -Wno-class-memaccess -fdiagnostics-color -Wformat=2 -Wcomment -Wall -Wextra -Wno-unused-parameter -Wno-alloc-size-larger-than -mcx16 -Wno-deprecated-declarations -Wstrict-aliasing=3 -DCLIENT_LICENSE_ID="public" -DNO_THREADS -ftls-model=initial-exec -DDIVSUFSORT_API= -fno-stack-protector RLS_FLAGS = -O3 -DNDEBUG -g3 WITH_BMI2 = 1 compile_cpu_flag: -march=haswell -mbmi -mbmi2 2024/08/20-07:13:14.897093 140500565382720 [top_zip_table.cc:62] topling-zip_table_reader: git_version_hash_info_is: commit 7f80399bfbd2071b6e0f5683e8ab7225b8e6e394 Author: leipeng Date: 2024-01-19 14:52:30 +0800 Change ToplingZipTableOptions::sampleRatio to vector g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. cpu_flag: -march=native -mbmi -mbmi2 2024/08/20-07:13:14.897108 140500565382720 [top_zip_table.cc:64] topling-rocks git_version_hash_info_is: commit 1240987ca13d0fe562c9b9c037155079f0877840 Author: leipeng Date: 2024-01-19 15:07:04 +0800 Change ToplingZipTableOptions::sampleRatio to vector g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. cpu_flag: -march=native -mbmi -mbmi2 2024/08/20-07:13:15.661972 140500565382720 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00/14646186.sst) /dev/shm/ToplingTemp/Topling-233791-U3aZXo 2024/08/20-07:13:16.155907 140500565382720 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00/14646186.sst): first pass time = 0.49's, 271.769'MB/sec 2024/08/20-07:13:19.714528 140500565382720 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00/14646186.sst): old prealloc_size = 147639500, real_size = 100302576 2024/08/20-07:13:19.714756 140500565382720 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00/14646186.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 197715 prefix = 4 raw-key = 0.0024 GB zip-key = 0.0004 GB avg-key = 12.00 avg-zkey = 1.94 raw-val = 0.1295 GB zip-val = 0.0999 GB avg-val = 654.85 avg-zval = 505.12 2024/08/20-07:13:19.715127 140500565382720 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00/14646186.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0004 GB, waited 0.000 sec, Key+Value = 0.134 GB 2024/08/20-07:13:20.178479 140500565382720 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00/14646186.sst): second pass time = 3.56's, 36.398'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.46's, 220.541'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 2042.172'MB/sec (index lex order gen) rebuild zvType time = 0.36's, 0.137'MB/sec write SST data time = 0.10's, 995.483'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 1.347'MB, throughput = 35026.245'MB/sec zip my value time = 3.56's, unzip length = 0.129'GB zip my value throughput = 36.398'MB/sec zip pipeline throughput = 99.926'MB/sec entries = 197715 avg-key = 24.00 avg-zkey = 1.94 avg-val = 654.85 avg-zval = 505.12 usrkeys = 197715 avg-key = 16.00 avg-zkey = 1.94 avg-val = 661.85 avg-zval = 505.12 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 197715 bytes = 716736 } seq expand size = 1384005 multi value expand size = 0 cnt WriteAppend = 12 UnZipSize{ index = 0.0032 GB value = 0.1295 GB dict = 1.35 MB all = 0.1342 GB } __ZipSize{ index = 0.0004 GB value = 0.0999 GB dict = 1.35 MB all = 0.1023 GB } UnZip/Zip{ index = 8.2546 value = 1.2964 dict = 1.00 all = 1.3118 } Zip/UnZip{ index = 0.1211 value = 0.7714 dict = 1.00 all = 0.7623 } ---------------------------- total value len = 62.427607 GB avg = 0.180 KB (by entry num) total key len = 6.793503 GB avg = 0.020 KB total ukey len = 3.192671 GB avg = 0.008 KB total ukey num = 0.389531276 Billion total entry num = 0.346409284 Billion write speed all = 1.408107231 MB/sec (with seq num) write speed all = 1.351733513 MB/sec (without seq num) 2024/08/20-07:13:20.298858 140500565382720 [compaction_job.cc:1944] [default] [JOB 14884] Generated table #14646186: 197715 keys, 102319264 bytes, temperature: kWarm 2024/08/20-07:13:20.298971 140500565382720 EVENT_LOG_v1 {"time_micros": 1724109200298896, "cf_name": "default", "job": 14884, "event": "table_file_creation", "file_number": 14646186, "file_size": 102319264, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 189647300645, "largest_seqno": 190165781999, "table_properties": {"data_size": 99869728, "index_size": 383232, "index_partitions": 0, "top_level_index_size": 0, "index_key_is_user_key": 0, "index_value_is_delta_encoded": 0, "filter_size": 0, "raw_key_size": 4745160, "raw_average_key_size": 24, "raw_value_size": 129472984, "raw_average_value_size": 654, "num_data_blocks": 1, "num_entries": 197715, "num_filter_entries": 0, "num_deletions": 0, "num_merge_operands": 0, "num_range_deletions": 0, "format_version": 0, "fixed_key_len": 24, "fixed_value_len": 18446744073709551615, "filter_policy": "", "column_family_name": "default", "column_family_id": 0, "comparator": "leveldb.BytewiseComparator", "merge_operator": "nullptr", "prefix_extractor_name": "nullptr", "property_collectors": "[Rdb_tbl_prop_coll_factory]", "compression": "FlatZip", "compression_options": "RS_Key0_Tag1-NestLoudsTrieDAWG_Mixed_XL_256_32_FL-DictZipBlobStore", "creation_time": 1724109195, "oldest_key_time": 0, "file_creation_time": 1724109195, "slow_compression_estimated_data_size": 0, "fast_compression_estimated_data_size": 0, "db_id": "a007a635-5c0a-4b4a-be96-b9c695cb016b", "db_session_id": "90ZT1ZM5QNL093I8HHQG", "orig_file_number": 14646186, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-07:13:20.378476 140500565382720 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00/14646187.sst) /dev/shm/ToplingTemp/Topling-233791-ty1p2o 2024/08/20-07:13:20.919214 140500565382720 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00/14646187.sst): first pass time = 0.54's, 112.583'MB/sec 2024/08/20-07:13:22.169327 140500565382720 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00/14646187.sst): old prealloc_size = 147639500, real_size = 45801760 2024/08/20-07:13:22.169465 140500565382720 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00/14646187.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 89672 prefix = 4 raw-key = 0.0011 GB zip-key = 0.0002 GB avg-key = 12.00 avg-zkey = 1.90 raw-val = 0.0587 GB zip-val = 0.0456 GB avg-val = 654.83 avg-zval = 508.61 2024/08/20-07:13:22.169612 140500565382720 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00/14646187.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0002 GB, waited 0.000 sec, Key+Value = 0.061 GB 2024/08/20-07:13:22.376062 140500565382720 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00/14646187.sst): second pass time = 1.25's, 47.038'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.21's, 225.880'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 1568.103'MB/sec (index lex order gen) rebuild zvType time = 0.16's, 0.138'MB/sec write SST data time = 0.04's, 1062.325'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 0.607'MB, throughput = 16467.469'MB/sec zip my value time = 1.25's, unzip length = 0.059'GB zip my value throughput = 47.038'MB/sec zip pipeline throughput = 85.645'MB/sec entries = 89672 avg-key = 24.00 avg-zkey = 1.90 avg-val = 654.83 avg-zval = 508.61 usrkeys = 89672 avg-key = 16.00 avg-zkey = 1.90 avg-val = 661.83 avg-zval = 508.61 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 89672 bytes = 302656 } seq expand size = 627704 multi value expand size = 0 cnt WriteAppend = 12 UnZipSize{ index = 0.0014 GB value = 0.0587 GB dict = 0.61 MB all = 0.0609 GB } __ZipSize{ index = 0.0002 GB value = 0.0456 GB dict = 0.61 MB all = 0.0467 GB } UnZip/Zip{ index = 8.4057 value = 1.2875 dict = 1.00 all = 1.3037 } Zip/UnZip{ index = 0.1190 value = 0.7767 dict = 1.00 all = 0.7670 } ---------------------------- total value len = 62.486954 GB avg = 0.180 KB (by entry num) total key len = 6.795655 GB avg = 0.020 KB total ukey len = 3.194106 GB avg = 0.008 KB total ukey num = 0.389620948 Billion total entry num = 0.346498956 Billion write speed all = 1.409295268 MB/sec (with seq num) write speed all = 1.352909477 MB/sec (without seq num) 2024/08/20-07:13:22.433284 140500565382720 [compaction_job.cc:1944] [default] [JOB 14884] Generated table #14646187: 89672 keys, 46691181 bytes, temperature: kWarm 2024/08/20-07:13:22.433357 140500565382720 EVENT_LOG_v1 {"time_micros": 1724109202433317, "cf_name": "default", "job": 14884, "event": "table_file_creation", "file_number": 14646187, "file_size": 46691181, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 190095658237, "largest_seqno": 190165781882, "table_properties": {"data_size": 45608464, "index_size": 170688, "index_partitions": 0, "top_level_index_size": 0, "index_key_is_user_key": 0, "index_value_is_delta_encoded": 0, "filter_size": 0, "raw_key_size": 2152128, "raw_average_key_size": 24, "raw_value_size": 58719865, "raw_average_value_size": 654, "num_data_blocks": 1, "num_entries": 89672, "num_filter_entries": 0, "num_deletions": 0, "num_merge_operands": 0, "num_range_deletions": 0, "format_version": 0, "fixed_key_len": 24, "fixed_value_len": 18446744073709551615, "filter_policy": "", "column_family_name": "default", "column_family_id": 0, "comparator": "leveldb.BytewiseComparator", "merge_operator": "nullptr", "prefix_extractor_name": "nullptr", "property_collectors": "[Rdb_tbl_prop_coll_factory]", "compression": "FlatZip", "compression_options": "RS_Key0_Tag1-NestLoudsTrieDAWG_Mixed_XL_256_32_FL-DictZipBlobStore", "creation_time": 1724109200, "oldest_key_time": 0, "file_creation_time": 1724109200, "slow_compression_estimated_data_size": 0, "fast_compression_estimated_data_size": 0, "db_id": "a007a635-5c0a-4b4a-be96-b9c695cb016b", "db_session_id": "90ZT1ZM5QNL093I8HHQG", "orig_file_number": 14646187, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-07:13:22.454006 140500565382720 [compaction_job.cc:699] job-14884: subcompact[0], size: 0.149010 G, files: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-14884/att-00 [14646186,14646187] 2024/08/20-07:13:22.480690 140500565382720 (Original Log Time 2024/08/20-07:13:14.631993) EVENT_LOG_v1 {"time_micros": 1724109194631943, "job": 14884, "event": "compaction_started", "compaction_reason": "FilesMarkedForCompaction", "files_L2": [14646161], "files_L3": [14646108, 14646109], "score": 0.984169, "input_data_size": 168999075, "oldest_snapshot_seqno": 190165864949} 2024/08/20-07:13:22.480693 140500565382720 (Original Log Time 2024/08/20-07:13:22.480264) [compaction_job.cc:2018] [default] [JOB 14884] Compacted 1@2 + 2@3 files to L3 => 149010445 bytes 2024/08/20-07:13:22.480695 140500565382720 (Original Log Time 2024/08/20-07:13:22.480619) [compaction_job.cc:1220] [default] compacted to: files[0 0 0 2 0 0 0] max score 0.01, MB/sec: 21.6 rd, 19.1 wr, level 3, files in(1, 2) out(2 +0 blob) MB in(21.1, 140.1 +0.0 blob) out(142.1 +0.0 blob), read-write-amplify(14.4) write-amplify(6.7) OK, records in: 315494, records dropped: 28107 output_compression: Snappy 2024/08/20-07:13:22.480703 140500565382720 (Original Log Time 2024/08/20-07:13:22.480666) EVENT_LOG_v1 {"time_micros": 1724109202480646, "cf": "default", "job": 14884, "event": "compaction_finished", "compaction_time_micros": 7822022, "compaction_time_cpu_micros": 1287707, "output_level": 3, "num_output_files": 2, "total_output_size": 149010445, "num_input_records": 315494, "num_output_records": 287387, "num_subcompactions": 1, "output_compression": "Snappy", "num_single_delete_mismatches": 0, "num_single_delete_fallthrough": 0, "file_write_nanos": 149391962, "file_range_sync_nanos": 0, "file_fsync_nanos": 1885, "file_prepare_write_nanos": 6332, "lsm_state": [0, 0, 0, 2, 0, 0, 0]} 2024/08/20-07:13:22.621767 140500565382720 DEBG dcompact_worker.cpp:240: HttpPost: 200 OK: url = http://nlb-7zny4kaa1poal01o64.cn-shenzhen.nlb.aliyuncs.com:8443, body = {"instanceId":"nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137","labourId":"","dbId":"a007a635-5c0a-4b4a-be96-b9c695cb016b","dbStarts":1724092920,"starts":1724109194,"executesMs":7962,"compactionJobId":14884,"attempt":0,"compactionInputRawBytes":214177396,"compactionInputZipBytes":168999075,"compactionOutputRawBytes":0,"compactionOutputZipBytes":149010445,"headers":{"Accept":"*/*","Connection":"close","Host":"aliyun-topling-saas.topling.cn:18443","RemoteIp":"120.24.192.169","X-Forwarded-For":"120.24.192.169","region":"cn-shenzhen","token":"e6474c481bd4415abc537135cc03626b","instance-token":"e6474c481bd4415abc537135cc03626b","provider":"aliyun","CloudMarketInstanceId":"si-59c0ae5c955845588903","MeteringAssit":"","Transfer-Encoding":"chunked","traceparent":"00-205fb0703eb600fbc42d926b4caa39c1-670b100ae3422824-00"}}, response = 2024/08/20-07:13:22.621873 140500565382720 INFO dcompact_worker.cpp:1456: finish /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-20T02.42.00/.rocksdb/job-14884/att-00: olev 3, work 7.962 s, result 4.895 ms, install 0.471 ms, input{raw 204.255 MiB zip 161.170 MiB}