How does redis cluster support pipeline

mushishi 2021-06-23 15:06:32
redis cluster support pipeline


When we want to operate a batch of key when , Can pass redis pipline After the execution, read all the results at one time to reduce the consumption of network transmission ; Obviously , There's a limit to that => This batch of key The execution of must be on the same connection

When deployed redis by standalone or master-slave When it comes to structure, it's OK , It can be downloaded from pool All the connections are one master Node , Then if redis cluster What to do when ? This batch of key Maybe in the same redis node It can also be spread across multiple redis nodes So that's multiple connections

redis cluster Although it's automatic key It was sliced , But it's right client The requirements are quite high , Need client to connect all cluster Nodes within ( This and db client Similar scheme ) And cache slots Distribution information , Then the same algorithm is used in the client hash Post positioning key Of slot And then positioning slot Of redis node , Then get the connection of the corresponding node and send the command

cluster pipeline Realize the idea

java Common clients jedis, Although the redis-cluster function , But it didn't provide cluster Under the pipeline Ability , We use it to encapsulate JedisClusterCRC16 Tools to calculate slot Positioning corresponds to redis node The connection of , according to redis node Take this batch of key Grouping , So each group key You can do it separately pipeline It's logical

Pseudo code

List<Integer, HostAndPort> slot2NodeMap; // Caching can be done by actively calling Jedis.clusterNodes obtain slot The mapping relationship , And cache it locally
List<String> keys // Need batch processing key
Map<HostAndPort, List<String>> node2Keys= new HashMap<>(); // The node corresponding to the keys grouping
for(String key : keys) {
// Calculation key Corresponding slot
int slot = JedisClusterCRC16.getSlot(key);
// according to slot Get the corresponding node information
node2Keys.get(slot2NodeMap.get(slot)).add(key);
}
// Group execution
for (Map.Entry<HostAndPort, List<String>> group : node2Keys) {
Jedis jedis = JedisClusterConnectionHandler.getConnectionFromNode(group.key);
jedis.pipelined();
// Execute this group keys
jedis.sync();
}
// Results aggregate

Be careful : stay cluster On the implementation pipeline It may be due to redis Node expansion and reduction halfway redirection Switching connections causes results to be lost ; You can put attempts The number of retries is set to 0 Automatic connection switching is not allowed To sense anomalies , Then the business takes the initiative to try again

jedis Official support ?

github In fact 2017 It's been submitted in cluster pipeline Of pr, The maintenance staff are happy to merge however ~~ The follow-up is slow , then 19 year merge review There's something unusual about it , The author did not follow up , As a result, the merger has not been successful ;
https://github.com/redis/jedis/pull/1455

image.png
Realization cluster pipeline You can also refer to this pr Submit code for

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