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Igor Canadi 91ddd587cc Only signal cond variable if need to 
Summary:
At the end of BackgroundCallCompaction(), we call SignalAll(), even though we don't need to. If compaction hasn't done anything and there's another compaction running, there is no need to signal on the condition variable. Doing so creates a tight feedback loop which results in log files like:

   wait for memtable flush
   compaction nothing to do
   wait for memtable flush
   compaction nothing to do

This change eliminates that

Test Plan:
make check
Also:

    icanadi@dev1440 ~ $ grep "nothing to do" /fast-rocksdb-tmp/rocksdb_test/column_family_test/LOG | wc -l
    7435
    icanadi@dev1440 ~ $ grep "nothing to do" /fast-rocksdb-tmp/rocksdb_test/column_family_test/LOG | wc -l
    372

First version is before the change, second version is after the change.

Reviewers: dhruba, ljin, haobo, yhchiang, sdong

Reviewed By: sdong

Subscribers: leveldb

Differential Revision: https://reviews.facebook.net/D18855
2014-06-02 17:23:55 -07:00
..
builder.cc Enhance partial merge to support multiple arguments 2014-03-24 17:57:13 -07:00
builder.h [Performance Branch] PlainTable to encode rows with seqID 0, value type using 1 internal byte. 2014-02-03 12:19:30 -08:00
c.cc Add rocksdb_open_for_read_only to C API 2014-04-27 20:57:10 +01:00
c_test.c kill ReadOptions.prefix and .prefix_seek 2014-04-25 12:21:34 -07:00
column_family.cc Flush stale column families less aggressively 2014-06-02 15:33:54 -07:00
column_family.h Flush stale column families less aggressively 2014-06-02 15:33:54 -07:00
column_family_test.cc Flush stale column families 2014-04-30 14:33:40 -04:00
compaction.cc FIFO compaction style 2014-05-21 11:43:35 -07:00
compaction.h FIFO compaction style 2014-05-21 11:43:35 -07:00
compaction_picker.cc FIFO compaction style 2014-05-21 11:43:35 -07:00
compaction_picker.h FIFO compaction style 2014-05-21 11:43:35 -07:00
corruption_test.cc Fix corruption test 2014-04-24 14:56:41 -04:00
db_bench.cc forward iterator 2014-05-30 14:31:55 -07:00
db_filesnapshot.cc Call EnableFileDeletions with false as argument 2014-05-20 14:28:51 -07:00
db_impl.cc Only signal cond variable if need to 2014-06-02 17:23:55 -07:00
db_impl.h Only signal cond variable if need to 2014-06-02 17:23:55 -07:00
db_impl_debug.cc FIFO compaction style 2014-05-21 11:43:35 -07:00
db_impl_readonly.cc Minimize accessing multiple objects in Version::Get() 2014-04-17 14:14:00 -07:00
db_impl_readonly.h [CF] Rethinking ColumnFamilyHandle and fix to dropping column families 2014-02-12 13:47:09 -08:00
db_iter.cc forward iterator 2014-05-30 14:31:55 -07:00
db_iter.h thread local for tailing iterator 2014-04-14 10:48:01 -07:00
db_stats_logger.cc RocksDBLite 2014-04-15 13:39:26 -07:00
db_test.cc FIFO compaction style 2014-05-21 11:43:35 -07:00
dbformat.cc macros for perf_context 2014-04-08 10:58:07 -07:00
dbformat.h forward iterator 2014-05-30 14:31:55 -07:00
dbformat_test.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
deletefile_test.cc Start DeleteFileTest with clean plate 2013-11-15 16:30:23 -08:00
file_indexer.cc hints for narrowing down FindFile range and avoiding checking unrelevant L0 files 2014-04-21 09:10:12 -07:00
file_indexer.h Remove TransactionLogIteratorRace when -DNDEBUG 2014-04-21 11:08:30 -07:00
file_indexer_test.cc Some fixes as preparation for release 2014-04-30 09:03:24 -07:00
filename.cc fsync directory after creating current file in NewDB() 2014-05-06 17:51:33 -07:00
filename.h fsync directory after creating current file in NewDB() 2014-05-06 17:51:33 -07:00
filename_test.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
forward_iterator.cc forward iterator 2014-05-30 14:31:55 -07:00
forward_iterator.h forward iterator 2014-05-30 14:31:55 -07:00
internal_stats.cc Expose number of entries in mem tables to users 2014-04-22 22:13:21 -07:00
internal_stats.h Expose number of entries in mem tables to users 2014-04-22 22:13:21 -07:00
log_and_apply_bench.cc log_and_apply_bench on a new benchmark framework 2014-05-05 11:11:48 -07:00
log_format.h Some minor refactoring on the code 2014-01-02 16:32:31 -08:00
log_reader.cc Make Log::Reader more robust 2014-02-28 13:19:47 -08:00
log_reader.h Fix UnmarkEOF for partial blocks 2014-01-27 14:49:10 -08:00
log_test.cc Make it compile on Debian/GCC 4.7 2014-03-14 22:44:35 +00:00
log_writer.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
log_writer.h Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
memtable.cc Pass logger to memtable rep and TLB page allocation error logged to info logs 2014-05-05 16:43:37 -07:00
memtable.h Add a new mem-table representation based on cuckoo hash. 2014-04-29 17:13:46 -07:00
memtable_list.cc Column family logging 2014-04-25 09:51:16 -04:00
memtable_list.h Expose number of entries in mem tables to users 2014-04-22 22:13:21 -07:00
merge_context.h Enhance partial merge to support multiple arguments 2014-03-24 17:57:13 -07:00
merge_helper.cc Fix the bug in MergeUtil which causes mixing values of different keys. 2014-03-27 16:15:25 -07:00
merge_helper.h [rocksdb] new CompactionFilterV2 API 2014-03-24 20:47:53 -07:00
merge_operator.cc Some small cleaning up to make some compiling environment happy 2014-03-26 18:11:41 -07:00
merge_test.cc Use new DBWithTTL API in tests 2014-04-28 23:46:24 -04:00
perf_context_test.cc Missing includes 2014-03-14 13:02:20 -07:00
plain_table_db_test.cc Revert "Revert "Allow allocating dynamic bloom, plain table indexes and hash linked list from huge page TLB"" 2014-05-04 13:56:29 -07:00
prefix_test.cc Make RocksDB work with newer gflags 2014-05-08 17:25:13 -07:00
repair.cc fsync directory after creating current file in NewDB() 2014-05-06 17:51:33 -07:00
simple_table_db_test.cc kill ReadOptions.prefix and .prefix_seek 2014-04-25 12:21:34 -07:00
skiplist.h Consolidate SliceTransform object ownership 2014-03-10 12:56:46 -07:00
skiplist_test.cc Clean up arena API 2014-01-30 22:10:10 -08:00
snapshot.h Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
table_cache.cc avoid calling FindFile twice in TwoLevelIterator for PlainTable 2014-04-25 12:23:07 -07:00
table_cache.h avoid calling FindFile twice in TwoLevelIterator for PlainTable 2014-04-25 12:23:07 -07:00
table_properties_collector.cc Extract metaindex block from block-based table 2013-12-05 16:34:16 -08:00
table_properties_collector.h TablePropertiesCollectorFactory 2014-05-13 12:30:55 -07:00
table_properties_collector_test.cc TablePropertiesCollectorFactory 2014-05-13 12:30:55 -07:00
tailing_iter.cc kill ReadOptions.prefix and .prefix_seek 2014-04-25 12:21:34 -07:00
tailing_iter.h kill ReadOptions.prefix and .prefix_seek 2014-04-25 12:21:34 -07:00
transaction_log_impl.cc Fixed a file-not-found issue when a log file is moved to archive. 2014-05-12 17:50:21 -07:00
transaction_log_impl.h RocksDBLite 2014-04-15 13:39:26 -07:00
version_edit.cc [fix] SIGSEGV when VersionEdit in MANIFEST is corrupted 2014-05-07 16:52:12 -07:00
version_edit.h Minimize accessing multiple objects in Version::Get() 2014-04-17 14:14:00 -07:00
version_edit_test.cc [CF] Dont reuse dropped column family IDs 2014-03-05 12:13:44 -08:00
version_set.cc FIFO compaction style 2014-05-21 11:43:35 -07:00
version_set.h forward iterator 2014-05-30 14:31:55 -07:00
version_set_test.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
write_batch.cc Support for column families in TTL DB 2014-04-22 11:27:33 -07:00
write_batch_internal.h Support for column families in TTL DB 2014-04-22 11:27:33 -07:00
write_batch_test.cc kill ReadOptions.prefix and .prefix_seek 2014-04-25 12:21:34 -07:00