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sdong 876c2dbff4 Allow readahead when reading option files. (#6372) 
Summary:
Right, when reading from option files, no readahead is used and 8KB buffer is used. It might introduce high latency if the file system provide high latency and doesn't do readahead. Instead, introduce a readahead to the file. When calling inside DB, infer the value from options.log_readahead. Otherwise, a default 512KB readahead size is used.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6372

Test Plan: Add --log_readahead_size in db_bench. Run it with several options and observe read size from option files using strace.

Differential Revision: D19727739

fbshipit-source-id: e6d8053b0a64259abc087f1f388b9cd66fa8a583
2020-02-07 15:18:26 -08:00
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backupable Introduce a new storage specific Env API (#5761) 2019-12-13 14:48:41 -08:00
blob_db BlobDB: ignore trivially moved files when updating the SST<->blob file mapping (#6381) 2020-02-07 12:50:57 -08:00
cassandra Organizing rocksdb/db directory 2019-05-31 11:57:01 -07:00
checkpoint Introduce a new storage specific Env API (#5761) 2019-12-13 14:48:41 -08:00
compaction_filters Comment out unused variables 2018-03-05 13:13:41 -08:00
convenience Auto roll logger to enforce options.keep_log_file_num immediately after a new file is created (#5370) 2019-05-31 10:50:19 -07:00
leveldb_options Change RocksDB License 2017-07-15 16:11:23 -07:00
memory Make clang-analyzer happy (#5821) 2019-09-18 15:25:48 -07:00
merge_operators Apply formatter to recent 200+ commits. (#5830) 2019-09-20 12:04:26 -07:00
option_change_migration Avoid double-compacting data in bottom level in manual compactions (#5138) 2019-04-16 23:32:20 -07:00
options Allow readahead when reading option files. (#6372) 2020-02-07 15:18:26 -08:00
persistent_cache Correct pragma once problem with Bazel on Windows (#6321) 2020-01-21 16:12:43 -08:00
simulator_cache Introduce a new storage specific Env API (#5761) 2019-12-13 14:48:41 -08:00
table_properties_collectors Reduce the number of random iterations in compact_on_deletion_collector_test (#5635) 2019-07-26 15:53:34 -07:00
trace Introduce a new storage specific Env API (#5761) 2019-12-13 14:48:41 -08:00
transactions Shorten certain test names to avoid infra failure (#6352) 2020-01-30 23:10:24 -08:00
ttl Apply formatter to recent 200+ commits. (#5830) 2019-09-20 12:04:26 -07:00
write_batch_with_index Fix crash in Transaction::MultiGet() when num_keys > 32 2019-12-16 20:39:35 -08:00
debug.cc Support GetAllKeyVersions() for non-default cf (#5544) 2019-07-07 22:43:52 -07:00
env_librados.cc Optionally wait on bytes_per_sync to smooth I/O (#5183) 2019-04-22 11:51:39 -07:00
env_librados.md Add EnvLibrados - RocksDB Env of RADOS (#1222) 2016-07-21 11:16:34 -07:00
env_librados_test.cc Move test related files under util/ to test_util/ (#5377) 2019-05-30 11:25:51 -07:00
env_mirror.cc Optionally wait on bytes_per_sync to smooth I/O (#5183) 2019-04-22 11:51:39 -07:00
env_mirror_test.cc Move test related files under util/ to test_util/ (#5377) 2019-05-30 11:25:51 -07:00
env_timed.cc Apply modernize-use-override (2nd iteration) 2019-02-14 14:41:36 -08:00
env_timed_test.cc Move test related files under util/ to test_util/ (#5377) 2019-05-30 11:25:51 -07:00
merge_operators.h New API to get all merge operands for a Key (#5604) 2019-08-06 14:26:44 -07:00
object_registry.cc The ObjectRegistry class replaces the Registrar and NewCustomObjects.… (#5293) 2019-07-23 17:13:05 -07:00
object_registry_test.cc The ObjectRegistry class replaces the Registrar and NewCustomObjects.… (#5293) 2019-07-23 17:13:05 -07:00
util_merge_operators_test.cc Move test related files under util/ to test_util/ (#5377) 2019-05-30 11:25:51 -07:00