Update examples/rocksdb_option_file_example.ini

Summary:
Update examples/rocksdb_option_file_example.ini to use the options file
generated by the db_bench readwhilewriting benchmark.

Test Plan: no code change.

Reviewers: igor, IslamAbdelRahman, rven, kradhakrishnan, sdong, anthony

Reviewed By: anthony

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D51567

examples/rocksdb_option_file_example.ini

@@ -1,6 +1,6 @@
 # This is a RocksDB option file.
 #
-# A typical RocksDB options file has three sections, which are
+# A typical RocksDB options file has four sections, which are
 # Version section, DBOptions section, at least one CFOptions
 # section, and one TableOptions section for each column family.
 # The RocksDB options file in general follows the basic INI
@@ -30,166 +30,113 @@
 #
 # Below is an example of a RocksDB options file:
 [Version]
-  rocksdb_version=4.0.0
+  rocksdb_version=4.3.0
   options_file_version=1.1
 
 [DBOptions]
   stats_dump_period_sec=600
   max_manifest_file_size=18446744073709551615
-  bytes_per_sync=0
-  delayed_write_rate=1048576
+  bytes_per_sync=8388608
+  delayed_write_rate=2097152
   WAL_ttl_seconds=0
   WAL_size_limit_MB=0
   max_subcompactions=1
   wal_dir=
   wal_bytes_per_sync=0
   db_write_buffer_size=0
-  max_total_wal_size=0
-  skip_stats_update_on_db_open=false
-  max_open_files=5000
+  keep_log_file_num=1000
+  table_cache_numshardbits=4
   max_file_opening_threads=1
+  writable_file_max_buffer_size=1048576
+  random_access_max_buffer_size=1048576
   use_fsync=false
-  max_background_compactions=1
+  max_total_wal_size=0
+  max_open_files=-1
+  skip_stats_update_on_db_open=false
+  max_background_compactions=16
   manifest_preallocation_size=4194304
-  max_background_flushes=1
+  max_background_flushes=7
   is_fd_close_on_exec=true
-  create_if_missing=false
-  use_adaptive_mutex=false
-  enable_thread_tracking=false
-  disableDataSync=false
   max_log_file_size=0
   advise_random_on_open=true
   create_missing_column_families=false
-  keep_log_file_num=1000
-  table_cache_numshardbits=4
-  error_if_exists=false
-  skip_log_error_on_recovery=false
-  allow_os_buffer=true
-  allow_mmap_reads=false
   paranoid_checks=true
   delete_obsolete_files_period_micros=21600000000
   disable_data_sync=false
   log_file_time_to_roll=0
   compaction_readahead_size=0
+  create_if_missing=false
+  use_adaptive_mutex=false
+  enable_thread_tracking=false
+  disableDataSync=false
+  allow_fallocate=true
+  error_if_exists=false
+  recycle_log_file_num=0
+  skip_log_error_on_recovery=false
+  allow_mmap_reads=false
+  allow_os_buffer=true
   db_log_dir=
-  new_table_reader_for_compaction_inputs=false
+  new_table_reader_for_compaction_inputs=true
   allow_mmap_writes=false
   
+
 [CFOptions "default"]
   compaction_style=kCompactionStyleLevel
   compaction_filter=nullptr
-  num_levels=7
+  num_levels=6
   table_factory=BlockBasedTable
   comparator=leveldb.BytewiseComparator
   max_sequential_skip_in_iterations=8
   soft_rate_limit=0.000000
-  max_bytes_for_level_base=536870912
+  max_bytes_for_level_base=1073741824
   memtable_prefix_bloom_probes=6
   memtable_prefix_bloom_bits=0
   memtable_prefix_bloom_huge_page_tlb_size=0
   max_successive_merges=0
-  arena_block_size=0
-  min_write_buffer_number_to_merge=2
+  arena_block_size=16777216
+  min_write_buffer_number_to_merge=1
   target_file_size_multiplier=1
   source_compaction_factor=1
-  max_bytes_for_level_multiplier=10
+  max_bytes_for_level_multiplier=8
   compaction_filter_factory=nullptr
-  max_write_buffer_number=6
-  level0_stop_writes_trigger=24
+  max_write_buffer_number=8
+  level0_stop_writes_trigger=20
   compression=kSnappyCompression
-  level0_file_num_compaction_trigger=2
+  level0_file_num_compaction_trigger=4
   purge_redundant_kvs_while_flush=true
   max_write_buffer_number_to_maintain=0
   memtable_factory=SkipListFactory
-  max_grandparent_overlap_factor=10
+  max_grandparent_overlap_factor=8
   expanded_compaction_factor=25
-  hard_pending_compaction_bytes_limit=0
+  hard_pending_compaction_bytes_limit=137438953472
   inplace_update_num_locks=10000
-  level_compaction_dynamic_level_bytes=false
-  level0_slowdown_writes_trigger=20
+  level_compaction_dynamic_level_bytes=true
+  level0_slowdown_writes_trigger=12
   filter_deletes=false
   verify_checksums_in_compaction=true
   min_partial_merge_operands=2
   paranoid_file_checks=false
-  target_file_size_base=67108864
+  target_file_size_base=134217728
   optimize_filters_for_hits=false
-  merge_operator=nullptr
-  compression_per_level=kNoCompression:kNoCompression:kSnappyCompression:kSnappyCompression:kSnappyCompression:kSnappyCompression:kSnappyCompression
+  merge_operator=PutOperator
+  compression_per_level=kNoCompression:kNoCompression:kNoCompression:kSnappyCompression:kSnappyCompression:kSnappyCompression
   compaction_measure_io_stats=false
   prefix_extractor=nullptr
   bloom_locality=0
   write_buffer_size=134217728
   disable_auto_compactions=false
   inplace_update_support=false
+  
 [TableOptions/BlockBasedTable "default"]
-  format_version=0
+  format_version=2
   whole_key_filtering=true
-  block_size_deviation=10
-  block_size=4096
-  block_restart_interval=16
-  filter_policy=nullptr
+  skip_table_builder_flush=false
   no_block_cache=false
   checksum=kCRC32c
-  cache_index_and_filter_blocks=false
-  index_type=kBinarySearch
-  hash_index_allow_collision=true
-  flush_block_policy_factory=FlushBlockBySizePolicyFactory
-
-[CFOptions "universal"]
-  compaction_style=kCompactionStyleUniversal
-  compaction_filter=nullptr
-  num_levels=7
-  table_factory=BlockBasedTable
-  comparator=leveldb.BytewiseComparator
-  max_sequential_skip_in_iterations=8
-  soft_rate_limit=0.000000
-  max_bytes_for_level_base=10485760
-  memtable_prefix_bloom_probes=6
-  memtable_prefix_bloom_bits=0
-  memtable_prefix_bloom_huge_page_tlb_size=0
-  max_successive_merges=0
-  arena_block_size=0
-  min_write_buffer_number_to_merge=2
-  target_file_size_multiplier=1
-  source_compaction_factor=1
-  max_bytes_for_level_multiplier=10
-  compaction_filter_factory=nullptr
-  max_write_buffer_number=6
-  level0_stop_writes_trigger=24
-  compression=kSnappyCompression
-  level0_file_num_compaction_trigger=4
-  purge_redundant_kvs_while_flush=true
-  max_write_buffer_number_to_maintain=0
-  memtable_factory=SkipListFactory
-  max_grandparent_overlap_factor=10
-  expanded_compaction_factor=25
-  hard_pending_compaction_bytes_limit=0
-  inplace_update_num_locks=10000
-  level_compaction_dynamic_level_bytes=false
-  level0_slowdown_writes_trigger=20
-  filter_deletes=false
-  verify_checksums_in_compaction=true
-  min_partial_merge_operands=2
-  paranoid_file_checks=false
-  target_file_size_base=2097152
-  optimize_filters_for_hits=false
-  merge_operator=nullptr
-  compression_per_level=
-  compaction_measure_io_stats=false
-  prefix_extractor=nullptr
-  bloom_locality=0
-  write_buffer_size=134217728
-  disable_auto_compactions=false
-  inplace_update_support=false
-[TableOptions/BlockBasedTable "universal"]
-  format_version=0
-  whole_key_filtering=true
+  filter_policy=rocksdb.BuiltinBloomFilter
   block_size_deviation=10
-  block_size=4096
+  block_size=8192
   block_restart_interval=16
-  filter_policy=nullptr
-  no_block_cache=false
-  checksum=kCRC32c
   cache_index_and_filter_blocks=false
   index_type=kBinarySearch
   hash_index_allow_collision=true