leveldb

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Author	SHA1	Message	Date
costan	23162ca1c6	Fix typo (forgotten reference operator) in test. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=171708408	2017-10-10 11:47:13 -07:00
Sanjay Ghemawat	ac1d69da31	LevelDB now attempts to reuse the preceding MANIFEST and log file when re-opened. (Based on a suggestion by cmumford.) "open" benchmark on my workstation speeds up significantly since we can now avoid three fdatasync calls and a compaction per open: Before: ~80000 microseconds After: ~130 microseconds Details: (1) Added Options::reuse_logs (currently defaults to false) to control new behavior. The intention is to change the default to true after some baking. (2) Added Env::NewAppendableFile() whose default implementation returns a not-supported error. (3) VersionSet::Recovery attempts to reuse the MANIFEST from which it is recovering. (4) DBImpl recovery attempts to reuse the last log file and memtable. (5) db_test.cc now tests a new configuration that sets reuse_logs to true. (6) fault_injection_test also tests a reuse_logs==true config. (7) Added a new recovery_test.	2015-08-11 14:56:39 -07:00
Chris Mumford	b234f65b34	Added a new fault injection test. This test is intended to ensure leveldb properly detects and recovers from faults - specifically unwritten file data lost as a result of a system reset.	2014-12-11 07:59:38 -08:00

Author

SHA1

Message

Date

costan

23162ca1c6

Fix typo (forgotten reference operator) in test.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=171708408

2017-10-10 11:47:13 -07:00

Sanjay Ghemawat

ac1d69da31

LevelDB now attempts to reuse the preceding MANIFEST and log file when re-opened.

(Based on a suggestion by cmumford.)

"open" benchmark on my workstation speeds up significantly since we
can now avoid three fdatasync calls and a compaction per open:

  Before: ~80000 microseconds
  After:    ~130 microseconds

Details:

(1) Added Options::reuse_logs (currently defaults to false) to control
new behavior.  The intention is to change the default to true after some
baking.

(2) Added Env::NewAppendableFile() whose default implementation returns
a not-supported error.

(3) VersionSet::Recovery attempts to reuse the MANIFEST from which
it is recovering.

(4) DBImpl recovery attempts to reuse the last log file and memtable.

(5) db_test.cc now tests a new configuration that sets reuse_logs to true.

(6) fault_injection_test also tests a reuse_logs==true config.

(7) Added a new recovery_test.

2015-08-11 14:56:39 -07:00

Chris Mumford

b234f65b34

Added a new fault injection test.

This test is intended to ensure leveldb properly detects and recovers from
faults - specifically unwritten file data lost as a result of a system reset.

2014-12-11 07:59:38 -08:00

3 Commits