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Add option for storing transaction logs in a separate dir

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Summary: In some cases, you might not want to store the data log (write ahead log) files in the same dir as the sst files. An example use case is leaf, which stores sst files in tmpfs. And would like to save the log files in a separate dir (disk) to save memory.

Test Plan: make all. Ran db_test test. A few test failing. P2785018. If you guys don't see an obvious problem with the code, maybe somebody from the rocksdb team could help me debug the issue here. Running this on leaf worked well. I could see logs stored on disk, and deleted appropriately after compactions. Obviously this is only one set of options. The unit tests cover different options. Seems like I'm missing some edge cases.

Reviewers: dhruba, haobo, leveldb

CC: xinyaohu, sumeet

Differential Revision: https://reviews.facebook.net/D13239
This commit is contained in:
Naman Gupta
2013-10-01 14:46:52 -07:00
parent 116071411b
commit cbf4a06427
8 changed files with 117 additions and 51 deletions
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12
include/rocksdb/options.h
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@@ -351,13 +351,21 @@ struct Options {
// Default value is 1800 (half an hour).
int db_stats_log_interval;
// This specifies the log dir.
// This specifies the info LOG dir.
// If it is empty, the log files will be in the same dir as data.
// If it is non empty, the log files will be in the specified dir,
// and the db data dir's absolute path will be used as the log file
// name's prefix.
std::string db_log_dir;
// This specifies the absolute dir path for write-ahead logs (WAL).
// If it is empty, the log files will be in the same dir as data,
// dbname is used as the data dir by default
// If it is non empty, the log files will be in kept the specified dir.
// When destroying the db,
// all log files in wal_dir and the dir itself is deleted
std::string wal_dir;
// Disable compaction triggered by seek.
// With bloomfilter and fast storage, a miss on one level
// is very cheap if the file handle is cached in table cache
@@ -461,7 +469,7 @@ struct Options {
// The number of seconds a WAL(write ahead log) should be kept after it has
// been marked as Not Live. If the value is set. The WAL files are moved to
// the archive direcotory and deleted after the given TTL.
// the archive directory and deleted after the given TTL.
// If set to 0, WAL files are deleted as soon as they are not required by
// the database.
// If set to std::numeric_limits<uint64_t>::max() the WAL files will never be