[redis.git] / TODO

Redis TODO
----------

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

VM TODO
=======

* 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.
* mmap the swap file.
* Use just a single IO Job to swap out a key, and add a mutex so that pages in the page table can be marked as used and scanned from the thread itself.

REPLICATION
===========

* PING between master and slave from time to time, so we can subject the
master-slave link to timeout, and detect when the connection is gone even
if the socket is still up.

OPTIMIZATIONS
=============

* 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.

KNOWN BUGS
==========

* 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.
Commit	Line	Data
4c22fd34	1	Redis TODO
4c22fd34	2	----------
f284d963	3
4c22fd34	4	WARNING: are you a possible Redis contributor?
	5	Before implementing what is listed what is listed in this file
	6	please drop a message in the Redis google group or chat with
	7	antirez or pietern on irc.freenode.org #redis to check if the work
	8	is already in progress and if the feature is still interesting for
	9	us, and how exactly this can be implemented to have good changes
	10	of a merge. Otherwise it is probably wasted work! Thank you
f6b141c5	11
bb8716b6	12	VM TODO
	13	=======
	14
7c775e09	15	* Use multiple open FDs against the VM file, one for thread.
469c4e45	16	* 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.
4c22fd34	17	* mmap the swap file.
4c22fd34	18	* Use just a single IO Job to swap out a key, and add a mutex so that pages in the page table can be marked as used and scanned from the thread itself.
bb8716b6	19
4c22fd34	20	REPLICATION
4c22fd34	21	===========
3f477979	22
4c22fd34	23	* PING between master and slave from time to time, so we can subject the
	24	master-slave link to timeout, and detect when the connection is gone even
	25	if the socket is still up.
3f477979	26
4c22fd34	27	OPTIMIZATIONS
4c22fd34	28	=============
0188805d	29
682ac724	30	* SORT: Don't copy the list into a vector when BY argument is constant.
682ac724	31	* 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.
4c22fd34	32	* Read-only mode for slaves.
cef34df0	33
	34	KNOWN BUGS
	35	==========
	36
4c22fd34	37	* What happens in the following scenario:
	38	1) We are reading an AOF file.
	39	2) SETEX FOO 5 BAR
	40	3) APPEND FOO ZAP
	41	What happens if between 1 and 2 for some reason (system under huge load
	42	or alike) too many time passes? We should prevent expires while the
	43	AOF is loading.
2cffe299	44