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Haobo Xu 05e8854085 [Rocksdb] Support Merge operation in rocksdb 
Summary:
This diff introduces a new Merge operation into rocksdb.
The purpose of this review is mostly getting feedback from the team (everyone please) on the design.

Please focus on the four files under include/leveldb/, as they spell the client visible interface change.
include/leveldb/db.h
include/leveldb/merge_operator.h
include/leveldb/options.h
include/leveldb/write_batch.h

Please go over local/my_test.cc carefully, as it is a concerete use case.

Please also review the impelmentation files to see if the straw man implementation makes sense.

Note that, the diff does pass all make check and truly supports forward iterator over db and a version
of Get that's based on iterator.

Future work:
- Integration with compaction
- A raw Get implementation

I am working on a wiki that explains the design and implementation choices, but coding comes
just naturally and I think it might be a good idea to share the code earlier. The code is
heavily commented.

Test Plan: run all local tests

Reviewers: dhruba, heyongqiang

Reviewed By: dhruba

CC: leveldb, zshao, sheki, emayanke, MarkCallaghan

Differential Revision: https://reviews.facebook.net/D9651
2013-05-03 16:59:02 -07:00
..
.nfs00000000066c9ebb00000002 Enhance db_bench 2013-03-14 16:00:23 -07:00
builder.cc [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
builder.h Ability to configure bufferedio-reads, filesystem-readaheads and mmap-read-write per database. 2013-03-20 23:14:03 -07:00
c.cc Fix poor error on num_levels mismatch and few other minor improvements 2013-01-25 15:37:26 -08:00
c_test.c Fix poor error on num_levels mismatch and few other minor improvements 2013-01-25 15:37:26 -08:00
corruption_test.cc [RocksDB] Move table.h to table/ 2013-04-22 16:07:56 -07:00
db_bench.cc [RocksDB] Print all internally collected histograms in db_bench. Also print p95 2013-04-25 13:36:47 -07:00
db_filesnapshot.cc Fix all the lint errors. 2012-11-28 17:18:41 -08:00
db_impl.cc [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
db_impl.h [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
db_impl_readonly.cc [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
db_impl_readonly.h [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
db_iter.cc [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
db_iter.h [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
db_statistics.h Refactor statistics. Remove individual functions like incNumFileOpens 2013-02-25 13:58:34 -08:00
db_stats_logger.cc remove boost 2012-09-16 19:33:43 -07:00
db_test.cc [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
dbformat.cc manifest_dump: Add --hex=1 option 2012-12-16 08:58:28 -08:00
dbformat.h [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
dbformat_test.cc Fix all warnings generated by -Wall option to the compiler. 2012-11-06 14:07:31 -08:00
filename.cc Allow the logs to be purged by TTL. 2013-02-04 19:42:40 -08:00
filename.h Added meta-database support. 2012-12-17 11:26:59 -08:00
filename_test.cc Added meta-database support. 2012-12-17 11:26:59 -08:00
log_file.h GetUpdatesSince API to enable replication. 2012-12-07 11:42:13 -08:00
log_format.h Fixed sign-comparison in rocksdb code-base and fixed Makefile 2013-03-19 14:35:23 -07:00
log_reader.cc Codemod NULL to nullptr 2013-02-28 18:04:58 -08:00
log_reader.h TransactionLogIter should stall at the last record. Currently it errors out 2013-03-21 15:12:35 -07:00
log_test.cc Fix more signed-unsigned comparisons 2013-03-19 17:21:36 -07:00
log_writer.cc Fix a number of object lifetime/ownership issues 2013-01-23 16:54:11 -08:00
log_writer.h Fix a number of object lifetime/ownership issues 2013-01-23 16:54:11 -08:00
memtable.cc [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
memtable.h [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
memtablelist.cc [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
memtablelist.h [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
merge_helper.cc [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
merge_helper.h [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
merge_test.cc [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
repair.cc Ability to configure bufferedio-reads, filesystem-readaheads and mmap-read-write per database. 2013-03-20 23:14:03 -07:00
skiplist.h Codemod NULL to nullptr 2013-02-28 18:04:58 -08:00
skiplist_test.cc Codemod NULL to nullptr 2013-02-28 18:04:58 -08:00
snapshot.h Ability for rocksdb to compact when flushing the in-memory memtable to a file in L0. 2013-03-04 00:01:47 -08:00
table_cache.cc [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
table_cache.h [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
transaction_log_iterator_impl.cc Allocate the LogReporter from heap. Summary: 2013-04-29 13:19:24 -07:00
transaction_log_iterator_impl.h Allocate the LogReporter from heap. Summary: 2013-04-29 13:19:24 -07:00
version_edit.cc Codemod NULL to nullptr 2013-02-28 18:04:58 -08:00
version_edit.h Fix poor error on num_levels mismatch and few other minor improvements 2013-01-25 15:37:26 -08:00
version_edit_test.cc Make some variables configurable for each db instance 2012-06-27 14:36:31 -07:00
version_set.cc [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
version_set.h [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
version_set_reduce_num_levels.cc Fix valgrind errors in rocksdb tests: auto_roll_logger_test, reduce_levels_test 2013-03-12 16:03:16 -07:00
version_set_test.cc Codemod NULL to nullptr 2013-02-28 18:04:58 -08:00
write_batch.cc [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00
write_batch_internal.h GetUpdatesSince API to enable replication. 2012-12-07 11:42:13 -08:00
write_batch_test.cc [Rocksdb] Support Merge operation in rocksdb 2013-05-03 16:59:02 -07:00