rocksdb/db
Zhichao Cao e8d332d97e Use FileChecksumGenFactory for SST file checksum (#6600)
Summary:
In the current implementation, sst file checksum is calculated by a shared checksum function object, which may make some checksum function hard to be applied here such as SHA1. In this implementation, each sst file will have its own checksum generator obejct, created by FileChecksumGenFactory. User needs to implement its own FilechecksumGenerator and Factory to plugin the in checksum calculation method.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6600

Test Plan: tested with make asan_check

Reviewed By: riversand963

Differential Revision: D20717670

Pulled By: zhichao-cao

fbshipit-source-id: 2a74c1c280ac11a07a1980185b43b671acaa71c6
2020-03-29 15:58:46 -07:00
..
blob Add blob files to VersionStorageInfo/VersionBuilder (#6597) 2020-03-26 18:51:53 -07:00
compaction Use FileChecksumGenFactory for SST file checksum (#6600) 2020-03-29 15:58:46 -07:00
db_impl Be able to decrease background thread's CPU priority when creating database backup (#6602) 2020-03-28 19:07:25 -07:00
arena_wrapped_db_iter.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
arena_wrapped_db_iter.h Iterator with timestamp (#6255) 2020-03-06 16:24:27 -08:00
builder.cc Use FileChecksumGenFactory for SST file checksum (#6600) 2020-03-29 15:58:46 -07:00
builder.h Pass IOStatus to write path and set retryable IO Error as hard error in BG jobs (#6487) 2020-03-27 16:04:43 -07:00
c_test.c Return NotSupported from WriteBatchWithIndex::DeleteRange (#5393) 2020-02-18 11:18:25 -08:00
c.cc Add function to set row cache on rocksdb_options_t (#6442) 2020-02-21 11:12:42 -08:00
column_family_test.cc fix some spelling typos (#6464) 2020-02-28 14:14:03 -08:00
column_family.cc Attempt to recover from db with missing table files (#6334) 2020-03-20 19:30:48 -07:00
column_family.h Attempt to recover from db with missing table files (#6334) 2020-03-20 19:30:48 -07:00
compact_files_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
compacted_db_impl.cc return timestamp from get (#6409) 2020-03-02 16:01:00 -08:00
compacted_db_impl.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
comparator_db_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
convenience.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
corruption_test.cc Simplify migration to FileSystem API (#6552) 2020-03-23 21:54:21 -07:00
cuckoo_table_db_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_basic_test.cc Use function objects as deleters in the block cache (#6545) 2020-03-26 16:19:58 -07:00
db_block_cache_test.cc Use function objects as deleters in the block cache (#6545) 2020-03-26 16:19:58 -07:00
db_bloom_filter_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_compaction_filter_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_compaction_test.cc CompactRange() to use bottom pool when goes to bottommost level (#6593) 2020-03-24 20:24:32 -07:00
db_dynamic_level_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_encryption_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_filesnapshot.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_flush_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_info_dumper.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_info_dumper.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_inplace_update_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_io_failure_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_iter_stress_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_iter_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_iter.cc Iterator with timestamp (#6255) 2020-03-06 16:24:27 -08:00
db_iter.h Iterator with timestamp (#6255) 2020-03-06 16:24:27 -08:00
db_iterator_test.cc fix some spelling typos (#6464) 2020-02-28 14:14:03 -08:00
db_log_iter_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_logical_block_size_cache_test.cc Get block size only in direct IO mode (#6522) 2020-03-20 15:26:10 -07:00
db_memtable_test.cc return timestamp from get (#6409) 2020-03-02 16:01:00 -08:00
db_merge_operand_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_merge_operator_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_options_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_properties_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_range_del_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_sst_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_statistics_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_table_properties_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_tailing_iter_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_test2.cc Skip high levels with no key falling in the range in CompactRange (#6482) 2020-03-04 20:15:25 -08:00
db_test_util.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_test_util.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_test.cc Migrate AppVeyor to CircleCI (#6518) 2020-03-13 21:58:51 -07:00
db_universal_compaction_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_wal_test.cc Fix db_wal_test::TruncateLastLogAfterRecoverWithoutFlush failure (#6437) 2020-03-05 17:18:16 -08:00
db_with_timestamp_basic_test.cc multiget support for timestamps (#6483) 2020-03-24 11:24:09 -07:00
db_write_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
dbformat_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
dbformat.cc Iterator with timestamp (#6255) 2020-03-06 16:24:27 -08:00
dbformat.h Iterator with timestamp (#6255) 2020-03-06 16:24:27 -08:00
deletefile_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
error_handler_fs_test.cc Be able to decrease background thread's CPU priority when creating database backup (#6602) 2020-03-28 19:07:25 -07:00
error_handler.cc Be able to decrease background thread's CPU priority when creating database backup (#6602) 2020-03-28 19:07:25 -07:00
error_handler.h Pass IOStatus to write path and set retryable IO Error as hard error in BG jobs (#6487) 2020-03-27 16:04:43 -07:00
event_helpers.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
event_helpers.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
experimental.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
external_sst_file_basic_test.cc Fix range deletion tombstone ingestion with global seqno (#6429) 2020-02-25 15:31:48 -08:00
external_sst_file_ingestion_job.cc Replace Directory with FSDirectory in DB (#6468) 2020-03-02 16:16:26 -08:00
external_sst_file_ingestion_job.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
external_sst_file_test.cc fix some spelling typos (#6464) 2020-02-28 14:14:03 -08:00
fault_injection_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
file_indexer_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
file_indexer.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
file_indexer.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
filename_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
flush_job_test.cc Pass IOStatus to write path and set retryable IO Error as hard error in BG jobs (#6487) 2020-03-27 16:04:43 -07:00
flush_job.cc Pass IOStatus to write path and set retryable IO Error as hard error in BG jobs (#6487) 2020-03-27 16:04:43 -07:00
flush_job.h Pass IOStatus to write path and set retryable IO Error as hard error in BG jobs (#6487) 2020-03-27 16:04:43 -07:00
flush_scheduler.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
flush_scheduler.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
forward_iterator_bench.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
forward_iterator.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
forward_iterator.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
import_column_family_job.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
import_column_family_job.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
import_column_family_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
internal_stats.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
internal_stats.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
job_context.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
listener_test.cc Move BlobDB related files under db/ to db/blob/ (#6519) 2020-03-12 11:00:56 -07:00
log_format.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
log_reader.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
log_reader.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
log_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
log_writer.cc Pass IOStatus to write path and set retryable IO Error as hard error in BG jobs (#6487) 2020-03-27 16:04:43 -07:00
log_writer.h Pass IOStatus to write path and set retryable IO Error as hard error in BG jobs (#6487) 2020-03-27 16:04:43 -07:00
logs_with_prep_tracker.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
logs_with_prep_tracker.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
lookup_key.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
malloc_stats.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
malloc_stats.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
manual_compaction_test.cc Skip high levels with no key falling in the range in CompactRange (#6482) 2020-03-04 20:15:25 -08:00
memtable_list_test.cc Pass IOStatus to write path and set retryable IO Error as hard error in BG jobs (#6487) 2020-03-27 16:04:43 -07:00
memtable_list.cc Pass IOStatus to write path and set retryable IO Error as hard error in BG jobs (#6487) 2020-03-27 16:04:43 -07:00
memtable_list.h Pass IOStatus to write path and set retryable IO Error as hard error in BG jobs (#6487) 2020-03-27 16:04:43 -07:00
memtable.cc multiget support for timestamps (#6483) 2020-03-24 11:24:09 -07:00
memtable.h return timestamp from get (#6409) 2020-03-02 16:01:00 -08:00
merge_context.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
merge_helper_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
merge_helper.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
merge_helper.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
merge_operator.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
merge_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
obsolete_files_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
options_file_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
perf_context_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
pinned_iterators_manager.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
plain_table_db_test.cc Add ppc64le builds to Travis (#6144) 2020-03-11 12:33:45 -07:00
pre_release_callback.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
prefix_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
range_del_aggregator_bench.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
range_del_aggregator_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
range_del_aggregator.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
range_del_aggregator.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
range_tombstone_fragmenter_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
range_tombstone_fragmenter.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
range_tombstone_fragmenter.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
read_callback.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
repair_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
repair.cc Pass IOStatus to write path and set retryable IO Error as hard error in BG jobs (#6487) 2020-03-27 16:04:43 -07:00
snapshot_checker.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
snapshot_impl.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
snapshot_impl.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
table_cache.cc Use function objects as deleters in the block cache (#6545) 2020-03-26 16:19:58 -07:00
table_cache.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
table_properties_collector_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
table_properties_collector.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
table_properties_collector.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
transaction_log_impl.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
transaction_log_impl.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
trim_history_scheduler.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
trim_history_scheduler.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
version_builder_test.cc Add blob files to VersionStorageInfo/VersionBuilder (#6597) 2020-03-26 18:51:53 -07:00
version_builder.cc Add blob files to VersionStorageInfo/VersionBuilder (#6597) 2020-03-26 18:51:53 -07:00
version_builder.h Attempt to recover from db with missing table files (#6334) 2020-03-20 19:30:48 -07:00
version_edit_handler.cc Attempt to recover from db with missing table files (#6334) 2020-03-20 19:30:48 -07:00
version_edit_handler.h Attempt to recover from db with missing table files (#6334) 2020-03-20 19:30:48 -07:00
version_edit_test.cc Revert "Added the safe-to-ignore tag to version_edit (#6530)" (#6569) 2020-03-23 10:27:47 -07:00
version_edit.cc Revert "Added the safe-to-ignore tag to version_edit (#6530)" (#6569) 2020-03-23 10:27:47 -07:00
version_edit.h Revert "Added the safe-to-ignore tag to version_edit (#6530)" (#6569) 2020-03-23 10:27:47 -07:00
version_set_test.cc Be able to decrease background thread's CPU priority when creating database backup (#6602) 2020-03-28 19:07:25 -07:00
version_set.cc Pass IOStatus to write path and set retryable IO Error as hard error in BG jobs (#6487) 2020-03-27 16:04:43 -07:00
version_set.h Pass IOStatus to write path and set retryable IO Error as hard error in BG jobs (#6487) 2020-03-27 16:04:43 -07:00
wal_manager_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
wal_manager.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
wal_manager.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
write_batch_base.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
write_batch_internal.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
write_batch_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
write_batch.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
write_callback_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
write_callback.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
write_controller_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
write_controller.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
write_controller.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
write_thread.cc fix some spelling typos (#6464) 2020-02-28 14:14:03 -08:00
write_thread.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00