2024/08/20-04:39:53.576266 140500456277568 DEBG dcompact_worker.cpp:2211: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00: fork to child time = 0.009985 sec 2024/08/20-04:39:53.577323 140500456277568 DEBG dcompact_worker.cpp:1011: Beg SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00 2024/08/20-04:39:53.582269 140500456277568 DEBG dcompact_worker.cpp:1031: End SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00 2024/08/20-04:39:53.582562 140500456277568 TRAC dcompact_worker.cpp:1081: INFO_LOG_LEVEL: rpc = INFO_LEVEL, env_var = undefined 2024/08/20-04:39:53.582872 140500456277568 [WARN] [column_family.cc:386] multiple cf_paths/db_paths and level_compaction_dynamic_level_bytes can't be used together 2024/08/20-04:39:53.619670 140500456277568 [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-07138/att-00/MANIFEST-14629260 2024/08/20-04:39:53.636246 140500456277568 [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-07138/att-00/MANIFEST-14629260 succeeded,manifest_file_number is 14629260, next_file_number is 14637320, last_sequence is 189964692047, log_number is 0,prev_log_number is 0,max_column_family is 0,min_log_number_to_keep is 14637214 2024/08/20-04:39:53.636254 140500456277568 [version_set.cc:6197] Column family [default] (ID 0), log number is 0 2024/08/20-04:39:53.636323 140500456277568 [version_set.cc:5652] Creating manifest 14637320 2024/08/20-04:39:53.662079 140500456277568 DEBG dcompact_worker.cpp:1215: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00: bottommost_level: fake = 1, rpc = 0 2024/08/20-04:39:53.674917 140500456277568 [compaction_job.cc:2433] [default] [JOB 7138] Compacting 1@3 + 1@4 files to L4, score 1.02, subcompactions 1 : 1 2024/08/20-04:39:53.674940 140500456277568 [compaction_job.cc:2441] [default]: Compaction start summary: Base version 3721 Base level 3, inputs: [14637311(38MB)], [14635744(75MB)] 2024/08/20-04:39:53.682263 140500456277568 [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 2024/08/20-04:39:53.682314 140500456277568 [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 2024/08/20-04:39:53.682342 140500456277568 [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 2024/08/20-04:39:53.682353 140500456277568 [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 2024/08/20-04:39:53.682362 140500456277568 [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 2024/08/20-04:39:54.476477 140500456277568 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00/14637321.sst) /dev/shm/ToplingTemp/Topling-173442-kZwID2 2024/08/20-04:39:55.725218 140500456277568 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00/14637321.sst): first pass time = 1.25's, 214.974'MB/sec 2024/08/20-04:39:59.316564 140500456277568 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00/14637321.sst): old prealloc_size = 131736565, real_size = 68731952 2024/08/20-04:39:59.317915 140500456277568 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00/14637321.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 1846372 prefix = 4 raw-key = 0.0295 GB zip-key = 0.0035 GB avg-key = 16.00 avg-zkey = 1.90 raw-val = 0.2167 GB zip-val = 0.0648 GB avg-val = 117.39 avg-zval = 35.07 2024/08/20-04:39:59.320793 140500456277568 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00/14637321.sst: sumWaitingMem = 0.005 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0048 GB, waited 0.000 sec, Key+Value = 0.268 GB 2024/08/20-04:40:01.403739 140500456277568 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00/14637321.sst): second pass time = 3.59's, 60.389'MB/sec, value only(80.7% of KV) wait indexing time = 0.00's, remap KeyValue time = 2.09's, 36.849'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 2626.481'MB/sec (index lex order gen) rebuild zvType time = 1.77's, 0.261'MB/sec write SST data time = 0.31's, 244.284'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 2.160'MB, throughput = 46803.329'MB/sec zip my value time = 3.59's, unzip length = 0.217'GB zip my value throughput = 60.389'MB/sec zip pipeline throughput = 60.389'MB/sec entries = 1846372 avg-key = 28.00 avg-zkey = 1.90 avg-val = 117.39 avg-zval = 35.07 usrkeys = 1846372 avg-key = 20.00 avg-zkey = 1.90 avg-val = 124.39 avg-zval = 35.07 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 1846372 bytes = 6462320 } seq expand size = 12924604 multi value expand size = 0 cnt WriteAppend = 13 UnZipSize{ index = 0.0369 GB value = 0.2167 GB dict = 2.16 MB all = 0.2684 GB } __ZipSize{ index = 0.0035 GB value = 0.0648 GB dict = 2.16 MB all = 0.0769 GB } UnZip/Zip{ index = 10.5185 value = 3.3468 dict = 1.00 all = 3.4902 } Zip/UnZip{ index = 0.0951 value = 0.2988 dict = 1.00 all = 0.2865 } ---------------------------- total value len = 62.526411 GB avg = 0.180 KB (by entry num) total key len = 6.840456 GB avg = 0.020 KB total ukey len = 3.226435 GB avg = 0.008 KB total ukey num = 0.391179933 Billion total entry num = 0.348057941 Billion write speed all = 1.735898853 MB/sec (with seq num) write speed all = 1.666217934 MB/sec (without seq num) 2024/08/20-04:40:01.492295 140500456277568 [compaction_job.cc:1944] [default] [JOB 7138] Generated table #14637321: 1846372 keys, 76910193 bytes, temperature: kWarm 2024/08/20-04:40:01.492383 140500456277568 EVENT_LOG_v1 {"time_micros": 1724100001492335, "cf_name": "default", "job": 7138, "event": "table_file_creation", "file_number": 14637321, "file_size": 76910193, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 189793096691, "largest_seqno": 189964004341, "table_properties": {"data_size": 64759456, "index_size": 3510720, "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": 51698416, "raw_average_key_size": 28, "raw_value_size": 216737092, "raw_average_value_size": 117, "num_data_blocks": 1, "num_entries": 1846372, "num_filter_entries": 0, "num_deletions": 0, "num_merge_operands": 0, "num_range_deletions": 0, "format_version": 0, "fixed_key_len": 28, "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": 1724099994, "oldest_key_time": 0, "file_creation_time": 1724099994, "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": 14637321, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-04:40:01.542720 140500456277568 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00/14637322.sst) /dev/shm/ToplingTemp/Topling-173442-VDcyH6 2024/08/20-04:40:01.977373 140500456277568 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00/14637322.sst): first pass time = 0.43's, 234.612'MB/sec 2024/08/20-04:40:03.147399 140500456277568 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00/14637322.sst): old prealloc_size = 131736565, real_size = 27543520 2024/08/20-04:40:03.147890 140500456277568 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00/14637322.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 700250 prefix = 4 raw-key = 0.0112 GB zip-key = 0.0013 GB avg-key = 16.00 avg-zkey = 1.90 raw-val = 0.0824 GB zip-val = 0.0260 GB avg-val = 117.61 avg-zval = 37.18 2024/08/20-04:40:03.148500 140500456277568 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00/14637322.sst: sumWaitingMem = 0.002 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0018 GB, waited 0.000 sec, Key+Value = 0.102 GB 2024/08/20-04:40:03.718051 140500456277568 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00/14637322.sst): second pass time = 1.17's, 70.448'MB/sec, value only(80.8% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.57's, 53.713'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 2881.036'MB/sec (index lex order gen) rebuild zvType time = 0.47's, 0.372'MB/sec write SST data time = 0.10's, 307.454'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 0.827'MB, throughput = 20666.683'MB/sec zip my value time = 1.17's, unzip length = 0.082'GB zip my value throughput = 70.448'MB/sec zip pipeline throughput = 79.066'MB/sec entries = 700250 avg-key = 28.00 avg-zkey = 1.90 avg-val = 117.61 avg-zval = 37.18 usrkeys = 700250 avg-key = 20.00 avg-zkey = 1.90 avg-val = 124.61 avg-zval = 37.18 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 700250 bytes = 2450896 } seq expand size = 4901750 multi value expand size = 0 cnt WriteAppend = 12 UnZipSize{ index = 0.0140 GB value = 0.0824 GB dict = 0.83 MB all = 0.1020 GB } __ZipSize{ index = 0.0013 GB value = 0.0260 GB dict = 0.83 MB all = 0.0307 GB } UnZip/Zip{ index = 10.5090 value = 3.1632 dict = 1.00 all = 3.3266 } Zip/UnZip{ index = 0.0952 value = 0.3161 dict = 1.00 all = 0.3006 } ---------------------------- total value len = 62.613670 GB avg = 0.180 KB (by entry num) total key len = 6.860063 GB avg = 0.020 KB total ukey len = 3.240440 GB avg = 0.008 KB total ukey num = 0.391880183 Billion total entry num = 0.348758191 Billion write speed all = 1.738472466 MB/sec (with seq num) write speed all = 1.668655402 MB/sec (without seq num) 2024/08/20-04:40:03.756708 140500456277568 [compaction_job.cc:1944] [default] [JOB 7138] Generated table #14637322: 700250 keys, 30651263 bytes, temperature: kWarm 2024/08/20-04:40:03.756783 140500456277568 EVENT_LOG_v1 {"time_micros": 1724100003756749, "cf_name": "default", "job": 7138, "event": "table_file_creation", "file_number": 14637322, "file_size": 30651263, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 189793096770, "largest_seqno": 189964003229, "table_properties": {"data_size": 26035600, "index_size": 1332672, "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": 19607000, "raw_average_key_size": 28, "raw_value_size": 82356728, "raw_average_value_size": 117, "num_data_blocks": 1, "num_entries": 700250, "num_filter_entries": 0, "num_deletions": 0, "num_merge_operands": 0, "num_range_deletions": 0, "format_version": 0, "fixed_key_len": 28, "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": 1724100001, "oldest_key_time": 0, "file_creation_time": 1724100001, "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": 14637322, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-04:40:03.788141 140500456277568 [compaction_job.cc:699] job-07138: subcompact[0], size: 0.107561 G, files: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-07138/att-00 [14637321,14637322] 2024/08/20-04:40:03.812920 140500456277568 (Original Log Time 2024/08/20-04:39:53.675008) EVENT_LOG_v1 {"time_micros": 1724099993674955, "job": 7138, "event": "compaction_started", "compaction_reason": "LevelMaxLevelSize", "files_L3": [14637311], "files_L4": [14635744], "score": 1.01992, "input_data_size": 119760514, "oldest_snapshot_seqno": 189964691114} 2024/08/20-04:40:03.812934 140500456277568 (Original Log Time 2024/08/20-04:40:03.812519) [compaction_job.cc:2018] [default] [JOB 7138] Compacted 1@3 + 1@4 files to L4 => 107561456 bytes 2024/08/20-04:40:03.812936 140500456277568 (Original Log Time 2024/08/20-04:40:03.812851) [compaction_job.cc:1220] [default] compacted to: files[0 0 0 0 2 0 0] max score 0.00, MB/sec: 11.8 rd, 10.6 wr, level 4, files in(1, 1) out(2 +0 blob) MB in(39.0, 75.2 +0.0 blob) out(102.6 +0.0 blob), read-write-amplify(5.6) write-amplify(2.6) OK, records in: 2773763, records dropped: 227141 output_compression: Snappy 2024/08/20-04:40:03.812944 140500456277568 (Original Log Time 2024/08/20-04:40:03.812896) EVENT_LOG_v1 {"time_micros": 1724100003812877, "cf": "default", "job": 7138, "event": "compaction_finished", "compaction_time_micros": 10113147, "compaction_time_cpu_micros": 4201639, "output_level": 4, "num_output_files": 2, "total_output_size": 107561456, "num_input_records": 2773763, "num_output_records": 2546622, "num_subcompactions": 1, "output_compression": "Snappy", "num_single_delete_mismatches": 0, "num_single_delete_fallthrough": 0, "file_write_nanos": 67247643, "file_range_sync_nanos": 0, "file_fsync_nanos": 1242, "file_prepare_write_nanos": 6718, "lsm_state": [0, 0, 0, 0, 2, 0, 0]} 2024/08/20-04:40:04.940789 140500456277568 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":1724099993,"executesMs":10231,"compactionJobId":7138,"attempt":0,"compactionInputRawBytes":402653258,"compactionInputZipBytes":119760514,"compactionOutputRawBytes":0,"compactionOutputZipBytes":107561456,"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-dafc4edef9a208c8f3daf26779d4fba9-95646a47ec71ae56-00"}}, response = 2024/08/20-04:40:04.940891 140500456277568 INFO dcompact_worker.cpp:1456: finish /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-20T02.42.00/.rocksdb/job-07138/att-00: olev 4, work 10.231 s, result 4.788 ms, install 0.445 ms, input{raw 384.000 MiB zip 114.213 MiB}