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During the first synchronization step of the replication process, a Redis slave connects with the master in a non blocking way. However once the connection is established the replication continues sending the REPLCONF command, and sometimes the AUTH command if needed. Those commands are send in a partially blocking way (blocking with timeout in the order of seconds). Because it is common for a blocked master to accept connections even if it is actually not able to reply to the slave requests, it was easy for a slave to block if the master had serious issues, but was still able to accept connections in the listening socket. For this reason we now send an asynchronous PING request just after the non blocking connection ended in a successful way, and wait for the reply before to continue with the replication process. It is very unlikely that a master replying to PING can't reply to the other commands. This solution was proposed by Didier Spezia (Thanks!) so that we don't need to turn all the replication process into a non blocking affair, but still the probability of a slave blocked is minimal even in the event of a failing master. Also we now use getsockopt(SO_ERROR) in order to check errors ASAP in the event handler, instead of waiting for actual I/O to return an error. This commit fixes issue #632. |
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src | ||
tests | ||
utils | ||
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00-RELEASENOTES | ||
BUGS | ||
Changelog | ||
CONTRIBUTING | ||
COPYING | ||
INSTALL | ||
Makefile | ||
MANIFESTO | ||
README | ||
redis.conf | ||
runtest | ||
sentinel.conf |
Where to find complete Redis documentation? ------------------------------------------- This README is just a fast "quick start" document. You can find more detailed documentation at http://redis.io Building Redis -------------- Redis can be compiled and used on Linux, OSX, OpenBSD, NetBSD, FreeBSD. We support big endian and little endian architectures. It may compile on Solaris derived systems (for instance SmartOS) but our support for this platform is "best effort" and Redis is not guaranteed to work as well as in Linux, OSX, and *BSD there. It is as simple as: % make You can run a 32 bit Redis binary using: % make 32bit After building Redis is a good idea to test it, using: % make test NOTE: if after building Redis with a 32 bit target you need to rebuild it with a 64 bit target you need to perform a "make clean" in the root directory of the Redis distribution. Allocator --------- Selecting a non-default memory allocator when building Redis is done by setting the `MALLOC` environment variable. Redis is compiled and linked against libc malloc by default, with the exception of jemalloc being the default on Linux systems. This default was picked because jemalloc has proven to have fewer fragmentation problems than libc malloc. To force compiling against libc malloc, use: % make MALLOC=libc To compile against jemalloc on Mac OS X systems, use: % make MALLOC=jemalloc Verbose build ------------- Redis will build with a user friendly colorized output by default. If you want to see a more verbose output use the following: % make V=1 Running Redis ------------- To run Redis with the default configuration just type: % cd src % ./redis-server If you want to provide your redis.conf, you have to run it using an additional parameter (the path of the configuration file): % cd src % ./redis-server /path/to/redis.conf It is possible to alter the Redis configuration passing parameters directly as options using the command line. Examples: % ./redis-server --port 9999 --slaveof 127.0.0.1 6379 % ./redis-server /etc/redis/6379.conf --loglevel debug All the options in redis.conf are also supported as options using the command line, with exactly the same name. Playing with Redis ------------------ You can use redis-cli to play with Redis. Start a redis-server instance, then in another terminal try the following: % cd src % ./redis-cli redis> ping PONG redis> set foo bar OK redis> get foo "bar" redis> incr mycounter (integer) 1 redis> incr mycounter (integer) 2 redis> You can find the list of all the available commands here: http://redis.io/commands Installing Redis ----------------- In order to install Redis binaries into /usr/local/bin just use: % make install You can use "make PREFIX=/some/other/directory install" if you wish to use a different destination. Make install will just install binaries in your system, but will not configure init scripts and configuration files in the appropriate place. This is not needed if you want just to play a bit with Redis, but if you are installing it the proper way for a production system, we have a script doing this for Ubuntu and Debian systems: % cd utils % ./install_server The script will ask you a few questions and will setup everything you need to run Redis properly as a background daemon that will start again on system reboots. You'll be able to stop and start Redis using the script named /etc/init.d/redis_<portnumber>, for instance /etc/init.d/redis_6379. Enjoy!