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Cluster: support to read from slave nodes.

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A client can enter a special cluster read-only mode using the READONLY
command: if the client read from a slave instance after this command,
for slots that are actually served by the instance's master, the queries
will be processed without redirection, allowing clients to read from
slaves (but without any kind fo read-after-write guarantee).

The READWRITE command can be used in order to exit the readonly state.
This commit is contained in:
antirez
2014-01-14 16:33:14 +01:00
parent aacbba2607
commit 28273394cb
4 changed files with 37 additions and 3 deletions
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src/networking.c
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@ -1263,6 +1263,7 @@ sds getClientInfoString(redisClient *client) {
if (client->flags & REDIS_UNBLOCKED) *p++ = 'u';
if (client->flags & REDIS_CLOSE_ASAP) *p++ = 'A';
if (client->flags & REDIS_UNIX_SOCKET) *p++ = 'U';
if (client->flags & REDIS_READONLY) *p++ = 'r';
if (p == flags) *p++ = 'N';
*p++ = '\0';