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rocksdb/java/rocksjni
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Alan Paxton f8969ad7d4 Improve Java API get() performance by reducing copies (#10970) 
Summary:
Performance improvements for `get()` paths in the RocksJava API (JNI).
Document describing the performance results.

Replace uses of the legacy `DB::Get()` method wrapper returning data in a `std::string` with direct calls to `DB::Get()` passing a pinnable slice to receive this data. Copying from a pinned slice direct to the destination java byte array, without going via an intervening std::string, is a major performance gain for this code path.

Note that this gain only comes where `DB::Get()` is able to return a pinned buffer; where it has to copy into the buffer owned by the slice, there is still the intervening copy and no performance gain. It may be possible to address this case too, but it is not trivial.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10970

Reviewed By: pdillinger

Differential Revision: D42125567

Pulled By: ajkr

fbshipit-source-id: b7a4df7523b0420cadb1e9b6c7da3ec030a8da34
 		2022-12-21 11:54:24 -08:00
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backup_engine_options.cc Fix remaining uses of "backupable" (#9792) 2022-04-05 09:52:33 -07:00
backupenginejni.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
cache.cc support getUsage and getPinnedUsage in JavaAPI for Cache (#7925) 2021-03-17 09:30:33 -07:00
cassandra_compactionfilterjni.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
cassandra_value_operator.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
checkpoint.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
clock_cache.cc Revert NewClockCache signature (#10358) 2022-07-13 17:43:39 -07:00
columnfamilyhandle.cc
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compact_range_options.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
compaction_filter.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
compaction_filter_factory.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
compaction_filter_factory_jnicallback.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
compaction_filter_factory_jnicallback.h Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
compaction_job_info.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
compaction_job_stats.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
compaction_options.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
compaction_options_fifo.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
compaction_options_universal.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
comparator.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
comparatorjnicallback.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
comparatorjnicallback.h Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
compression_options.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
concurrent_task_limiter.cc Add some missing headers (#10519) 2022-08-11 12:45:50 -07:00
config_options.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
cplusplus_to_java_convert.h Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
env.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
env_options.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
event_listener.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
event_listener_jnicallback.cc Add (& fix) some simple source code checks (#8821) 2021-09-07 21:19:27 -07:00
event_listener_jnicallback.h Add (& fix) some simple source code checks (#8821) 2021-09-07 21:19:27 -07:00
filter.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
ingest_external_file_options.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
iterator.cc Extend Java RocksDB iterators to support indirect Byte Buffers (#9222) 2022-03-24 12:50:38 -07:00
jnicallback.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
jnicallback.h Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
loggerjnicallback.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
loggerjnicallback.h Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
lru_cache.cc Use the default metadata charge policy when creating an LRU cache via the Java API (#10577) 2022-08-29 09:42:04 -07:00
memory_util.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
memtablejni.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
merge_operator.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
native_comparator_wrapper_test.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
optimistic_transaction_db.cc RocksJava API - fix Transaction.multiGet() size limit, remove bogus EnsureLocalCapacity() calls (#10674) 2022-10-26 17:25:33 -07:00
optimistic_transaction_options.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
options.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
options_util.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
persistent_cache.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
portal.h Add some async read stats (#10947) 2022-11-13 21:38:35 -08:00
ratelimiterjni.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
remove_emptyvalue_compactionfilterjni.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
restorejni.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
rocks_callback_object.cc Fix tabs and lint-ignores (#6734) 2020-04-20 11:39:31 -07:00
rocksdb_exception_test.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
rocksjni.cc Improve Java API get() performance by reducing copies (#10970) 2022-12-21 11:54:24 -08:00
slice.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
snapshot.cc
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sst_file_manager.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
sst_file_reader_iterator.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
sst_file_readerjni.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
sst_file_writerjni.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
sst_partitioner.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
statistics.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
statisticsjni.cc Fix tabs and lint-ignores (#6734) 2020-04-20 11:39:31 -07:00
statisticsjni.h Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
table.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
table_filter.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
table_filter_jnicallback.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
table_filter_jnicallback.h Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
testable_event_listener.cc Update build files for java8 build (#9541) 2022-02-17 13:29:21 -08:00
thread_status.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
trace_writer.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
trace_writer_jnicallback.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
trace_writer_jnicallback.h Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
transaction.cc RocksJava API - fix Transaction.multiGet() size limit, remove bogus EnsureLocalCapacity() calls (#10674) 2022-10-26 17:25:33 -07:00
transaction_db.cc RocksJava API - fix Transaction.multiGet() size limit, remove bogus EnsureLocalCapacity() calls (#10674) 2022-10-26 17:25:33 -07:00
transaction_db_options.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
transaction_log.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
transaction_notifier.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
transaction_notifier_jnicallback.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
transaction_notifier_jnicallback.h Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
transaction_options.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
ttl.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
wal_filter.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
wal_filter_jnicallback.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
wal_filter_jnicallback.h Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
write_batch.cc Fix pointer to jlong conversion in 32 bit OS (#9396) 2022-03-01 09:02:15 -08:00
write_batch_test.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
write_batch_with_index.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
write_buffer_manager.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
writebatchhandlerjnicallback.cc Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00
writebatchhandlerjnicallback.h Run format check for *.h and *.cc files under java/ (#10851) 2022-10-25 09:26:51 -07:00