X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/bb8716b6dc6980415da8b40b46ffb6e637f33a6c..615e414c5d9add3c0445d28b6d7ca62905dc8cd8:/TODO diff --git a/TODO b/TODO index 4fcdb18f..dd6ba28b 100644 --- a/TODO +++ b/TODO @@ -1,58 +1,85 @@ -Redis TODO and Roadmap ----------------------- +Redis TODO +---------- -VERSION 2.2 TODO (Optimizations and latency) -============================================ +WARNING: are you a possible Redis contributor? + Before implementing what is listed what is listed in this file + please drop a message in the Redis google group or chat with + antirez or pietern on irc.freenode.org #redis to check if the work + is already in progress and if the feature is still interesting for + us, and *how* exactly this can be implemented to have good changes + of a merge. Otherwise it is probably wasted work! Thank you -* Support for syslog(3). -* Change the implementation of ZCOUNT to use the augmented skiplist in order to be much faster. -VM TODO -======= +API CHANGES +=========== -* Use multiple open FDs against the VM file, one for thread. -* Check what happens performance-wise if instead of creating threads again and again the same threads are reused forever. Note: this requires a way to disable this clients in the child, but waiting for empty new jobs queue can be enough. +* Turn commands into variadic versions when it makes sense, that is, when + the variable number of arguments represent values, and there is no conflict + with the return value of the command. -STRING COMMANDS -=============== +CLUSTER +======= -* Implement STRLEN, PEEK, POKE, SETBIT, GETBIT +* Implement rehashing and cluster check in redis-trib. +* Reimplement MIGRATE / RESTORE to use just in memory buffers (no disk at + all). This will require touching a lot of the RDB stuff around, but we may + hand with faster persistence for RDB. +* Implement the slave nodes semantics and election. +* Allow redis-trib to create a cluster-wide snapshot (using SYNC). +* Allow redis-trib to restore a cluster-wide snapshot (implement UPLOAD?). -OTHER IMPORTANT THINGS THAT WILL BE ADDED BUT I'M NOT SURE WHEN -=============================================================== +APPEND ONLY FILE +================ -BIG ONES: +* in AOF rewirte use HMSET to rewrite small hashes instead of multiple calls + to HSET. -* BRPOPLPUSH -* Specially encoded memory-saving integer sets. -* A command to export a JSON dump (there should be mostly working patch needing major reworking). -* Specially encoded sets of integers (this includes a big refactoring providing an higher level layer for Sets manipulation) +OPTIMIZATIONS +============= -SMALL ONES: +* Avoid COW due to incrementing the dict iterators counter. +* SORT: Don't copy the list into a vector when BY argument is constant. +* Write the hash table size of every db in the dump, so that Redis can resize the hash table just one time when loading a big DB. +* Read-only mode for slaves. +* Redis big lists as linked lists of small ziplists? + Possibly a simple heuristic that join near nodes when some node gets smaller than the low_level, and split it into two if gets bigger than high_level. -* If sizeof(double) == sizeof(void*) we could store the double value of sorted sets directly in place of the pointer instead of allocating it in the heap. -* Delete on writes against expire policy should only happen after argument parsing for commands doing their own arg parsing stuff. -* Give errors when incrementing a key that does not look like an integer, when providing as a sorted set score something can't be parsed as a double, and so forth. -* MSADD (n keys) (n values). See this thread in the Redis google group: http://groups.google.com/group/redis-db/browse_thread/thread/e766d84eb375cd41 -* Don't save empty lists / sets / zsets on disk with snapshotting. -* Remove keys when a list / set / zset reaches length of 0. -* An option to exec a command slave-side if the master connection is lost: even cooler: if the script returns "0" the slave elects itself as master, otherwise continue trying to reconnect. -* PING the master from time to time to check if it's gone. +REPORTING +========= -THE "MAYBE" TODO LIST: things that may or may not get implemented -================================================================= +* Better INFO output with sections. -Most of this can be seen just as proposals, the fact they are in this list -it's not a guarantee they'll ever get implemented ;) +RANDOM +====== -* SORT: Don't copy the list into a vector when BY argument is constant. -* Write the hash table size of every db in the dump, so that Redis can resize the hash table just one time when loading a big DB. -* Byte Array type (BA prefixed commands): BASETBIT BAGETBIT BASETU8 U16 U32 U64 S8 S16 S32 S64, ability to atomically INCRBY all the base types. BARANGE to get a range of bytes as a bulk value, BASETRANGE to set a range of bytes. -* Read-only mode. -* Kill the delete-on-write behavior of expires, replicating DELs -* Multiple BY in SORT. +* Clients should be closed as far as the output buffer list is bigger than a given number of elements (configurable in redis.conf) +* Should the redis default configuration, and the default redis.conf, just bind 127.0.0.1? KNOWN BUGS ========== -* LRANGE and other commands are using 32 bit integers for ranges, and overflows are not detected. So LRANGE mylist 0 23498204823094823904823904 will have random effects. +* What happens in the following scenario: + 1) We are reading an AOF file. + 2) SETEX FOO 5 BAR + 3) APPEND FOO ZAP + What happens if between 1 and 2 for some reason (system under huge load + or alike) too many time passes? We should prevent expires while the + AOF is loading. +* #519: Slave may have expired keys that were never read in the master (so a DEL + is not sent in the replication channel) but are already expired since + a lot of time. Maybe after a given delay that is undoubltly greater than + the replication link latency we should expire this key on the slave on + access? + +DISKSTORE TODO +============== + +* Fix FLUSHALL/FLUSHDB: the queue of pending reads/writes should be handled. +* Check that 00/00 and ff/ff exist at startup, otherwise exit with error. +* Implement sync flush option, where data is written synchronously on disk when a command is executed. +* Implement MULTI/EXEC as transaction abstract API to diskstore.c, with transaction_start, transaction_end, and a journal to recover. +* Stop BGSAVE thread on shutdown and any other condition where the child is killed during normal bgsave. +* Fix RANDOMKEY to really do something interesting +* Fix DBSIZE to really do something interesting +* Add a DEBUG command to check if an entry is or not in memory currently +* dscache.c near 236, kobj = createStringObject... we could use static obj.