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jsteemann de76909464 refactor SavePoints (#5192) 
Summary:
Savepoints are assumed to be used in a stack-wise fashion (only
the top element should be used), so they were stored by `WriteBatch`
in a member variable `save_points` using an std::stack.

Conceptually this is fine, but the implementation had a few issues:
- the `save_points_` instance variable was a plain pointer to a heap-
  allocated `SavePoints` struct. The destructor of `WriteBatch` simply
  deletes this pointer. However, the copy constructor of WriteBatch
  just copied that pointer, meaning that copying a WriteBatch with
  active savepoints will very likely have crashed before. Now a proper
  copy of the savepoints is made in the copy constructor, and not just
  a copy of the pointer
- `save_points_` was an std::stack, which defaults to `std::deque` for
  the underlying container. A deque is a bit over the top here, as we
  only need access to the most recent savepoint (i.e. stack.top()) but
  never any elements at the front. std::deque is rather expensive to
  initialize in common environments. For example, the STL implementation
  shipped with GNU g++ will perform a heap allocation of more than 500
  bytes to create an empty deque object. Although the `save_points_`
  container is created lazily by RocksDB, moving from a deque to a plain
  `std::vector` is much more memory-efficient. So `save_points_` is now
  a vector.
- `save_points_` was changed from a plain pointer to an `std::unique_ptr`,
  making ownership more explicit.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5192

Differential Revision: D15024074

Pulled By: maysamyabandeh

fbshipit-source-id: 5b128786d3789cde94e46465c9e91badd07a25d7
2019-04-19 20:33:04 -07:00
..
aligned_buffer.h Fix Copying of data between buffers in FilePrefetchBuffer (#4100) 2018-07-11 12:28:13 -07:00
allocator.h Change RocksDB License 2017-07-15 16:11:23 -07:00
arena.cc comment unused parameters to turn on -Wunused-parameter flag 2018-04-12 17:59:16 -07:00
arena.h arena: derive alignment unit from std::max_align_t 2017-10-17 11:13:19 -07:00
arena_test.cc arena: derive alignment unit from std::max_align_t 2017-10-17 11:13:19 -07:00
auto_roll_logger.cc Change RocksDB License 2017-07-15 16:11:23 -07:00
auto_roll_logger.h Fix the Logger::Close() and DBImpl::Close() design pattern 2018-02-23 13:57:26 -08:00
auto_roll_logger_test.cc Fix many bugs in log statement arguments (#5089) 2019-04-04 12:12:11 -07:00
autovector.h Use placement new and delete in autovector (#5080) 2019-03-20 10:42:04 -07:00
autovector_test.cc fix memory leak in two_level_iterator 2018-04-15 17:26:26 -07:00
bloom.cc Introduce a new MultiGet batching implementation (#5011) 2019-04-11 14:28:26 -07:00
bloom_test.cc Apply modernize-use-override (2nd iteration) 2019-02-14 14:41:36 -08:00
build_version.cc.in Add copyright headers per FB open-source checkup tool. (#5199) 2019-04-18 10:55:01 -07:00
build_version.h Change RocksDB License 2017-07-15 16:11:23 -07:00
cast_util.h Add a missing "once" in .h 2017-07-31 12:12:03 -07:00
channel.h Support pragma once in all header files and cleanup some warnings (#4339) 2018-09-05 18:13:31 -07:00
coding.cc Enable MSVC W4 with a few exceptions. Fix warnings and bugs 2017-10-19 10:57:12 -07:00
coding.h Add path to WritableFileWriter. (#4039) 2018-08-23 10:12:58 -07:00
coding_test.cc Coding.h: Added Fixed16 support (#4142) 2018-07-16 23:43:41 -07:00
compaction_job_stats_impl.cc Add a new CPU time counter to compaction report (#4889) 2019-01-29 17:24:00 -08:00
comparator.cc Apply modernize-use-override (2nd iteration) 2019-02-14 14:41:36 -08:00
compression.h add compression options to table properties (#5081) 2019-04-02 14:52:34 -07:00
compression_context_cache.cc run make format for PR 3838 (#3954) 2018-06-05 12:58:02 -07:00
compression_context_cache.h run make format for PR 3838 (#3954) 2018-06-05 12:58:02 -07:00
concurrent_arena.cc Cap concurrent arena's shard block size to 128KB (#4147) 2018-07-18 10:43:54 -07:00
concurrent_arena.h util: Fix coverity issues 2017-11-03 14:42:08 -07:00
concurrent_task_limiter_impl.cc Compaction limiter miscs (#4795) 2018-12-26 13:59:35 -08:00
concurrent_task_limiter_impl.h Concurrent task limiter for compaction thread control (#4332) 2018-12-13 13:18:28 -08:00
core_local.h Change RocksDB License 2017-07-15 16:11:23 -07:00
crc32c.cc Add GCC 8 to Travis (#3433) 2018-07-13 10:58:06 -07:00
crc32c.h Updated CRC32 Power Optimization Changes 2017-08-31 14:16:30 -07:00
crc32c_ppc.c Add copyright headers per FB open-source checkup tool. (#5199) 2019-04-18 10:55:01 -07:00
crc32c_ppc.h Add copyright headers per FB open-source checkup tool. (#5199) 2019-04-18 10:55:01 -07:00
crc32c_ppc_asm.S Add copyright headers per FB open-source checkup tool. (#5199) 2019-04-18 10:55:01 -07:00
crc32c_ppc_constants.h Add copyright headers per FB open-source checkup tool. (#5199) 2019-04-18 10:55:01 -07:00
crc32c_test.cc Build and tests fixes for Solaris Sparc (#4000) 2018-06-15 12:42:53 -07:00
delete_scheduler.cc Always delete Blob DB files in the background (#4928) 2019-01-29 15:50:03 -08:00
delete_scheduler.h Always delete Blob DB files in the background (#4928) 2019-01-29 15:50:03 -08:00
delete_scheduler_test.cc Apply modernize-use-override (2nd iteration) 2019-02-14 14:41:36 -08:00
duplicate_detector.h Fix many bugs in log statement arguments (#5089) 2019-04-04 12:12:11 -07:00
dynamic_bloom.cc Disallow customized hash function in DynamicBloom (#4915) 2019-01-24 10:34:30 -08:00
dynamic_bloom.h Disallow customized hash function in DynamicBloom (#4915) 2019-01-24 10:34:30 -08:00
dynamic_bloom_test.cc Two code changes to make "clang analyze" happy (#4292) 2018-08-20 17:43:41 -07:00
event_logger.cc Change RocksDB License 2017-07-15 16:11:23 -07:00
event_logger.h Change RocksDB License 2017-07-15 16:11:23 -07:00
event_logger_test.cc Apply modernize-use-override (2nd iteration) 2019-02-14 14:41:36 -08:00
fault_injection_test_env.cc Atomic ingest (#4895) 2019-02-12 19:16:17 -08:00
fault_injection_test_env.h Introduce a new MultiGet batching implementation (#5011) 2019-04-11 14:28:26 -07:00
file_reader_writer.cc Apply modernize-use-override (2nd iteration) 2019-02-14 14:41:36 -08:00
file_reader_writer.h Add a new CPU time counter to compaction report (#4889) 2019-01-29 17:24:00 -08:00
file_reader_writer_test.cc Apply modernize-use-override (2nd iteration) 2019-02-14 14:41:36 -08:00
file_util.cc Smooth the deletion of WAL files (#5116) 2019-03-28 15:17:13 -07:00
file_util.h Smooth the deletion of WAL files (#5116) 2019-03-28 15:17:13 -07:00
filelock_test.cc Apply modernize-use-override (2nd iteration) 2019-02-14 14:41:36 -08:00
filename.cc Store the return value of Fsync for check 2018-09-14 13:29:56 -07:00
filename.h BlobDB: GetLiveFiles and GetLiveFilesMetadata return relative path (#4326) 2018-08-31 12:12:49 -07:00
filter_policy.cc Change RocksDB License 2017-07-15 16:11:23 -07:00
gflags_compat.h fix gflags namespace 2017-12-01 10:42:05 -08:00
hash.cc Add GCC 8 to Travis (#3433) 2018-07-13 10:58:06 -07:00
hash.h Consolidate hash function used for non-persistent data in a new function (#5155) 2019-04-08 13:32:06 -07:00
hash_map.h Change RocksDB License 2017-07-15 16:11:23 -07:00
hash_test.cc Change RocksDB License 2017-07-15 16:11:23 -07:00
heap.h Add compaction logic to RangeDelAggregatorV2 (#4758) 2018-12-17 13:20:51 -08:00
heap_test.cc fix gflags namespace 2017-12-01 10:42:05 -08:00
jemalloc_nodump_allocator.cc Detect if Jemalloc is linked with the binary (#4844) 2019-01-03 16:30:12 -08:00
jemalloc_nodump_allocator.h Detect if Jemalloc is linked with the binary (#4844) 2019-01-03 16:30:12 -08:00
kv_map.h Consolidate hash function used for non-persistent data in a new function (#5155) 2019-04-08 13:32:06 -07:00
log_buffer.cc Change RocksDB License 2017-07-15 16:11:23 -07:00
log_buffer.h Change RocksDB License 2017-07-15 16:11:23 -07:00
log_write_bench.cc Update all unique/shared_ptr instances to be qualified with namespace std (#4638) 2018-11-09 11:19:58 -08:00
logging.h WritePrepared: Improve stress tests with slow threads (#4974) 2019-02-19 16:56:49 -08:00
memory_allocator.h s/CacheAllocator/MemoryAllocator/g (#4590) 2018-10-26 14:30:30 -07:00
memory_usage.h Change RocksDB License 2017-07-15 16:11:23 -07:00
mock_time_env.h Update RepeatableThreadTest with MockTimeEnv (#5107) 2019-03-29 10:08:50 -07:00
murmurhash.cc Add GCC 8 to Travis (#3433) 2018-07-13 10:58:06 -07:00
murmurhash.h Change RocksDB License 2017-07-15 16:11:23 -07:00
mutexlock.h Change RocksDB License 2017-07-15 16:11:23 -07:00
ppc-opcode.h Add copyright headers per FB open-source checkup tool. (#5199) 2019-04-18 10:55:01 -07:00
random.cc Change RocksDB License 2017-07-15 16:11:23 -07:00
random.h Change RocksDB License 2017-07-15 16:11:23 -07:00
rate_limiter.cc rate limit auto-tuning 2017-10-04 19:15:01 -07:00
rate_limiter.h rate limit auto-tuning 2017-10-04 19:15:01 -07:00
rate_limiter_test.cc comment unused parameters to turn on -Wunused-parameter flag 2018-04-12 17:59:16 -07:00
repeatable_thread.h Update RepeatableThreadTest with MockTimeEnv (#5107) 2019-03-29 10:08:50 -07:00
repeatable_thread_test.cc Update RepeatableThreadTest with MockTimeEnv (#5107) 2019-03-29 10:08:50 -07:00
set_comparator.h WritePrepared Txn: Move DuplicateDetector to util 2018-03-05 23:57:12 -08:00
slice.cc Apply modernize-use-override (2nd iteration) 2019-02-14 14:41:36 -08:00
slice_transform_test.cc Apply modernize-use-override (2nd iteration) 2019-02-14 14:41:36 -08:00
sst_file_manager_impl.cc Fix many bugs in log statement arguments (#5089) 2019-04-04 12:12:11 -07:00
sst_file_manager_impl.h Always delete Blob DB files in the background (#4928) 2019-01-29 15:50:03 -08:00
status.cc Support for single-primary, multi-secondary instances (#4899) 2019-03-26 16:45:31 -07:00
stderr_logger.h Change RocksDB License 2017-07-15 16:11:23 -07:00
stop_watch.h Make statistics's stats_level change thread-safe (#5030) 2019-03-01 10:42:09 -08:00
string_util.cc add OptionType kInt32T and kInt64T 2019-03-12 13:49:52 -07:00
string_util.h add OptionType kInt32T and kInt64T 2019-03-12 13:49:52 -07:00
sync_point.cc Add read retry support to log reader (#4394) 2018-10-19 11:53:00 -07:00
sync_point.h Fix singleton destruction order of PosixEnv and SyncPoint (#3951) 2018-06-04 15:58:46 -07:00
sync_point_impl.cc Avoid acquiring SyncPoint mutex when it is disabled (#3991) 2018-06-13 13:13:18 -07:00
sync_point_impl.h Avoid acquiring SyncPoint mutex when it is disabled (#3991) 2018-06-13 13:13:18 -07:00
testharness.cc Per-thread unique test db names (#4135) 2018-07-13 17:27:39 -07:00
testharness.h Per-thread unique test db names (#4135) 2018-07-13 17:27:39 -07:00
testutil.cc Periodic Compactions (#5166) 2019-04-10 19:31:18 -07:00
testutil.h Backup engine support for direct I/O reads (#4640) 2018-11-13 11:17:25 -08:00
thread_list_test.cc Use nullptr instead of NULL / 0 more consistently. 2018-03-07 12:42:12 -08:00
thread_local.cc Enable building of ARM32 (#4349) 2018-10-09 16:58:25 -07:00
thread_local.h Provide a way to override windows memory allocator with jemalloc for ZSTD 2018-06-04 12:12:48 -07:00
thread_local_test.cc Comment out unused variables 2018-03-05 13:13:41 -08:00
thread_operation.h Add inline comments to flush job (#4464) 2018-10-05 15:41:17 -07:00
threadpool_imp.cc refactor SavePoints (#5192) 2019-04-19 20:33:04 -07:00
threadpool_imp.h Support lowering CPU priority of background threads 2018-04-24 08:41:51 -07:00
timer_queue.h When closing BlobDB, should first wait for all background tasks (#5005) 2019-02-21 17:26:01 -08:00
timer_queue_test.cc Change RocksDB License 2017-07-15 16:11:23 -07:00
trace_replay.cc Add an option to filter traces (#5082) 2019-03-19 14:36:51 -07:00
trace_replay.h Add an option to filter traces (#5082) 2019-03-19 14:36:51 -07:00
transaction_test_util.cc Fix many bugs in log statement arguments (#5089) 2019-04-04 12:12:11 -07:00
transaction_test_util.h Enhance transaction_test_util with delays (#4970) 2019-02-11 16:02:37 -08:00
user_comparator_wrapper.h Fix perf_context.user_key_comparison_count for range scan (#5098) 2019-03-27 10:34:27 -07:00
util.h Add GCC 8 to Travis (#3433) 2018-07-13 10:58:06 -07:00
vector_iterator.h Add copyright headers per FB open-source checkup tool. (#5199) 2019-04-18 10:55:01 -07:00
xxhash.cc Add copyright headers per FB open-source checkup tool. (#5199) 2019-04-18 10:55:01 -07:00
xxhash.h Add copyright headers per FB open-source checkup tool. (#5199) 2019-04-18 10:55:01 -07:00