mirror of
https://github.com/facebook/rocksdb.git
synced 2024-11-26 07:30:54 +00:00
236d4c67e9
Summary: In one deployment we saw high latencies (presumably from slow iterator operations) and a lot of CPU time reported by perf with this stack: ``` rocksdb::MergingIterator::Next rocksdb::DBIter::FindNextUserEntryInternal rocksdb::DBIter::Seek ``` I think what's happening is: 1. we create a snapshot iterator, 2. we do lots of Put()s for the same key x; this creates lots of entries in memtable, 3. we seek the iterator to a key slightly smaller than x, 4. the seek walks over lots of entries in memtable for key x, skipping them because of high sequence numbers. CC IslamAbdelRahman Closes https://github.com/facebook/rocksdb/pull/1413 Differential Revision: D4083879 Pulled By: IslamAbdelRahman fbshipit-source-id: a83ddae
74 lines
700 B
Plaintext
74 lines
700 B
Plaintext
TARGETS
|
|
make_config.mk
|
|
|
|
*.a
|
|
*.arc
|
|
*.d
|
|
*.dylib*
|
|
*.gcda
|
|
*.gcno
|
|
*.o
|
|
*.so
|
|
*.so.*
|
|
*_test
|
|
*_bench
|
|
*_stress
|
|
*.out
|
|
*.class
|
|
*.jar
|
|
*.*jnilib*
|
|
*.d-e
|
|
*.o-*
|
|
*.swp
|
|
*~
|
|
*.vcxproj
|
|
*.vcxproj.filters
|
|
*.sln
|
|
*.cmake
|
|
CMakeCache.txt
|
|
CMakeFiles/
|
|
build/
|
|
|
|
ldb
|
|
manifest_dump
|
|
sst_dump
|
|
column_aware_encoding_exp
|
|
util/build_version.cc
|
|
build_tools/VALGRIND_LOGS/
|
|
coverage/COVERAGE_REPORT
|
|
.gdbhistory
|
|
.gdb_history
|
|
package/
|
|
.phutil_module_cache
|
|
unity.a
|
|
tags
|
|
rocksdb_dump
|
|
rocksdb_undump
|
|
db_test2
|
|
|
|
java/out
|
|
java/target
|
|
java/test-libs
|
|
java/*.log
|
|
java/include/org_rocksdb_*.h
|
|
|
|
.idea/
|
|
*.iml
|
|
|
|
rocksdb.cc
|
|
rocksdb.h
|
|
unity.cc
|
|
java/crossbuild/.vagrant
|
|
.vagrant/
|
|
java/**.asc
|
|
java/javadoc
|
|
|
|
scan_build_report/
|
|
t
|
|
LOG
|
|
|
|
db_logs/
|
|
tp2/
|
|
fbcode/
|
|
fbcode
|