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Andrew Kryczka 643c863b72 minimize BlockIter comparator scope (#7149) 
Summary:
PR https://github.com/facebook/rocksdb/issues/6944 transitioned `BlockIter` from using `Comparator*` to using
concrete `UserComparatorWrapper` and `InternalKeyComparator`. However,
adding them as instance variables to `BlockIter` was not optimal.
Bloating `BlockIter` caused the `ArenaWrappedDBIter`'s arena allocator to do more heap
allocations (in certain cases) which harmed performance of `DB::NewIterator()`. This PR
pushes down the concrete comparator objects to the point of usage, which
forces them to be on the stack. As a result, the `BlockIter` is back to
its original size prior to https://github.com/facebook/rocksdb/issues/6944 (actually a bit smaller since there
were two `Comparator*` before).

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7149

Test Plan:
verified our internal `DB::NewIterator()`-heavy regression
test no longer reports regression.

Reviewed By: riversand963

Differential Revision: D22623189

Pulled By: ajkr

fbshipit-source-id: f6d69accfe5de51e0bd9874a480b32b29909bab6
2020-07-20 14:07:04 -07:00
..
adaptive Extend Get/MultiGet deadline support to table open (#6982) 2020-06-29 14:53:17 -07:00
block_based minimize BlockIter comparator scope (#7149) 2020-07-20 14:07:04 -07:00
cuckoo Extend Get/MultiGet deadline support to table open (#6982) 2020-06-29 14:53:17 -07:00
plain Fixed Factory construct just for calling .Name() (#7080) 2020-07-08 11:54:00 -07:00
block_fetcher.cc Skip unnecessary allocation for mmap reads under 5000 bytes (#7043) 2020-06-30 15:40:40 -07:00
block_fetcher.h Reduce memory copies when fetching and uncompressing blocks from SST files (#6689) 2020-04-24 15:32:56 -07:00
block_fetcher_test.cc More Makefile Cleanup (#7097) 2020-07-09 14:35:17 -07:00
cleanable_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
format.cc Extend Get/MultiGet deadline support to table open (#6982) 2020-06-29 14:53:17 -07:00
format.h Extend Get/MultiGet deadline support to table open (#6982) 2020-06-29 14:53:17 -07:00
get_context.cc Add timestamp to delete (#6253) 2020-05-28 10:40:03 -07:00
get_context.h Stats for redundant insertions into block cache (#6681) 2020-04-27 13:20:27 -07:00
internal_iterator.h Properly report IO errors when IndexType::kBinarySearchWithFirstKey is used (#6621) 2020-04-15 17:40:44 -07:00
iter_heap.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
iterator.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
iterator_wrapper.h Properly report IO errors when IndexType::kBinarySearchWithFirstKey is used (#6621) 2020-04-15 17:40:44 -07:00
merger_test.cc More Makefile Cleanup (#7097) 2020-07-09 14:35:17 -07:00
merging_iterator.cc Properly report IO errors when IndexType::kBinarySearchWithFirstKey is used (#6621) 2020-04-15 17:40:44 -07:00
merging_iterator.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
meta_blocks.cc Separate internal and user key comparators in BlockIter (#6944) 2020-07-07 17:26:16 -07:00
meta_blocks.h Extend Get/MultiGet deadline support to table open (#6982) 2020-06-29 14:53:17 -07:00
mock_table.cc Extend Get/MultiGet deadline support to table open (#6982) 2020-06-29 14:53:17 -07:00
mock_table.h Extend Get/MultiGet deadline support to table open (#6982) 2020-06-29 14:53:17 -07:00
multiget_context.h Allow MultiGet users to limit cumulative value size (#6826) 2020-05-27 13:07:14 -07:00
persistent_cache_helper.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
persistent_cache_helper.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
persistent_cache_options.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
scoped_arena_iterator.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
sst_file_dumper.cc Fix GetFileDbIdentities (#7104) 2020-07-09 08:37:59 -07:00
sst_file_dumper.h Fix GetFileDbIdentities (#7104) 2020-07-09 08:37:59 -07:00
sst_file_reader.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
sst_file_reader_test.cc Allow table/sst_file_reader_test.cc to use custom Env (#6536) 2020-03-17 11:02:13 -07:00
sst_file_writer.cc Store DB identity and DB session ID in SST files (#6983) 2020-06-17 10:57:40 -07:00
sst_file_writer_collectors.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
table_builder.h Store DB identity and DB session ID in SST files (#6983) 2020-06-17 10:57:40 -07:00
table_properties.cc Store DB identity and DB session ID in SST files (#6983) 2020-06-17 10:57:40 -07:00
table_properties_internal.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
table_reader.h For ApproximateSizes, pro-rate table metadata size over data blocks (#6784) 2020-06-02 12:30:23 -07:00
table_reader_bench.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
table_reader_caller.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
table_test.cc More Makefile Cleanup (#7097) 2020-07-09 14:35:17 -07:00
two_level_iterator.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
two_level_iterator.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00