Table of Contents(中文说明)
- 1. Redis-replicator
- 2. Install
- 3. Simple usage
- 4. Advanced topics
- 5. Other topics
- 6. Contributors
- 7. Consulting
- 8. References
- 9. Supported by
Redis Replicator implement Redis Replication protocol written in java. It can parse, filter, broadcast the RDB and AOF events in a real time manner. It also can synchronize redis data to your local cache or to database. The following I mentioned Command which means Writable Command(e.g. set,hmset) in Redis and excludes the Readable Command(e.g. get,hmget), Supported redis-6.2 and former redis versions.
compile minimal jdk 9+
runtime minimal jdk 8+
maven-3.3.1+
redis 2.6 - 7.0
<dependency>
<groupId>com.moilioncircle</groupId>
<artifactId>redis-replicator</artifactId>
<version>3.8.1</version>
</dependency> step 1: install jdk-9.0.x for compile(or jdk-11.0.x)
step 2: git clone https://github.com/leonchen83/redis-replicator.git
step 3: $cd ./redis-replicator
step 4: $mvn clean install package -DskipTests
| redis version | redis-replicator version |
|---|---|
| [2.6, 7.2.x] | [3.8.0, ] |
| [2.6, 7.0.x] | [3.6.4, 3.7.0] |
| [2.6, 7.0.x-RC2] | [3.6.2, 3.6.3] |
| [2.6, 7.0.0-RC1] | [3.6.0, 3.6.1] |
| [2.6, 6.2.x] | [3.5.2, 3.5.5] |
| [2.6, 6.2.0-RC1] | [3.5.0, 3.5.1] |
| [2.6, 6.0.x] | [3.4.0, 3.4.4] |
| [2.6, 5.0.x] | [2.6.1, 3.3.3] |
| [2.6, 4.0.x] | [2.3.0, 2.5.0] |
| [2.6, 4.0-RC3] | [2.1.0, 2.2.0] |
| [2.6, 3.2.x] | [1.0.18](not supported) |
Replicator replicator = new RedisReplicator("redis://127.0.0.1:6379");
replicator.addEventListener(new EventListener() {
@Override
public void onEvent(Replicator replicator, Event event) {
if (event instanceof KeyStringValueString) {
KeyStringValueString kv = (KeyStringValueString) event;
System.out.println(new String(kv.getKey()));
System.out.println(new String(kv.getValue()));
} else {
....
}
}
});
replicator.open();We can use DumpRdbVisitor to convert rdb to redis DUMP format.
Replicator r = new RedisReplicator("redis:///path/to/dump.rdb");
r.setRdbVisitor(new DumpRdbVisitor(r));
r.addEventListener(new EventListener() {
@Override
public void onEvent(Replicator replicator, Event event) {
if (!(event instanceof DumpKeyValuePair)) return;
DumpKeyValuePair dkv = (DumpKeyValuePair) event;
byte[] serialized = dkv.getValue();
// we can use redis RESTORE command to migrate this serialized value to another redis.
}
});
r.open();We can use SkipRdbVisitor to check rdb's correctness.
Replicator r = new RedisReplicator("redis:///path/to/dump.rdb");
r.setRdbVisitor(new SkipRdbVisitor(r));
r.open();By default, redis-replicator uses PSYNC to pretend as slave to receives commands. examples like following
Replicator r = new RedisReplicator("redis://127.0.0.1:6379");
r.addEventListener(new EventListener() {
@Override
public void onEvent(Replicator replicator, Event event) {
System.out.println(event);
}
});
r.open();However, under some cloud services, the PSYNC command is prohibited, so we use the Scan command instead of the PSYNC command
Replicator r = new RedisReplicator("redis://127.0.0.1:6379?enableScan=yes&scanStep=256");
r.addEventListener(new EventListener() {
@Override
public void onEvent(Replicator replicator, Event event) {
System.out.println(event);
}
});
r.open();See examples
@CommandSpec(command = "APPEND")
public static class YourAppendCommand extends AbstractCommand {
private final String key;
private final String value;
public YourAppendCommand(String key, String value) {
this.key = key;
this.value = value;
}
public String getKey() {
return key;
}
public String getValue() {
return value;
}
} public class YourAppendParser implements CommandParser<YourAppendCommand> {
@Override
public YourAppendCommand parse(Object[] command) {
return new YourAppendCommand(new String((byte[]) command[1], UTF_8), new String((byte[]) command[2], UTF_8));
}
} Replicator replicator = new RedisReplicator("redis://127.0.0.1:6379");
replicator.addCommandParser(CommandName.name("APPEND"),new YourAppendParser()); replicator.addEventListener(new EventListener() {
@Override
public void onEvent(Replicator replicator, Event event) {
if(event instanceof YourAppendCommand){
YourAppendCommand appendCommand = (YourAppendCommand)event;
// your code goes here
}
}
});See CommandExtensionExample.java
$cd /path/to/redis-4.0-rc2/src/modules
$make loadmodule /path/to/redis-4.0-rc2/src/modules/hellotype.so public class HelloTypeModuleParser implements ModuleParser<HelloTypeModule> {
@Override
public HelloTypeModule parse(RedisInputStream in, int version) throws IOException {
DefaultRdbModuleParser parser = new DefaultRdbModuleParser(in);
int elements = parser.loadUnsigned(version).intValue();
long[] ary = new long[elements];
int i = 0;
while (elements-- > 0) {
ary[i++] = parser.loadSigned(version);
}
return new HelloTypeModule(ary);
}
}
public class HelloTypeModule implements Module {
private final long[] value;
public HelloTypeModule(long[] value) {
this.value = value;
}
public long[] getValue() {
return value;
}
} public class HelloTypeParser implements CommandParser<HelloTypeCommand> {
@Override
public HelloTypeCommand parse(Object[] command) {
String key = new String((byte[]) command[1], Constants.UTF_8);
long value = Long.parseLong(new String((byte[]) command[2], Constants.UTF_8));
return new HelloTypeCommand(key, value);
}
}
@CommandSpec(command = "hellotype.insert")
public class HelloTypeCommand extends AbstractCommand {
private final String key;
private final long value;
public long getValue() {
return value;
}
public String getKey() {
return key;
}
public HelloTypeCommand(String key, long value) {
this.key = key;
this.value = value;
}
} public static void main(String[] args) throws IOException {
Replicator replicator = new RedisReplicator("redis://127.0.0.1:6379");
replicator.addCommandParser(CommandName.name("hellotype.insert"), new HelloTypeParser());
replicator.addModuleParser("hellotype", 0, new HelloTypeModuleParser());
replicator.addEventListener(new EventListener() {
@Override
public void onEvent(Replicator replicator, Event event) {
if (event instanceof KeyStringValueModule) {
System.out.println(event);
}
if (event instanceof HelloTypeCommand) {
System.out.println(event);
}
}
});
replicator.open();
}See ModuleExtensionExample.java
Since Redis 5.0+, Redis add a new data structure STREAM. Redis-replicator parse the STREAM like the following:
Replicator r = new RedisReplicator("redis://127.0.0.1:6379");
r.addEventListener(new EventListener() {
@Override
public void onEvent(Replicator replicator, Event event) {
if (event instanceof KeyStringValueStream) {
KeyStringValueStream kv = (KeyStringValueStream)event;
// key
String key = kv.getKey();
// stream
Stream stream = kv.getValueAsStream();
// last stream id
stream.getLastId();
// entries
NavigableMap<Stream.ID, Stream.Entry> entries = stream.getEntries();
// optional : group
for (Stream.Group group : stream.getGroups()) {
// group PEL(pending entries list)
NavigableMap<Stream.ID, Stream.Nack> gpel = group.getPendingEntries();
// consumer
for (Stream.Consumer consumer : group.getConsumers()) {
// consumer PEL(pending entries list)
NavigableMap<Stream.ID, Stream.Nack> cpel = consumer.getPendingEntries();
}
}
}
}
});
r.open();- Write
YourRdbVisitorextendsRdbVisitor - Register your
RdbVisitortoReplicatorusingsetRdbVisitormethod.
Before redis-replicator-2.4.0, We construct RedisReplicator like the following:
Replicator replicator = new RedisReplicator("127.0.0.1", 6379, Configuration.defaultSetting());
Replicator replicator = new RedisReplicator(new File("/path/to/dump.rdb", FileType.RDB, Configuration.defaultSetting());
Replicator replicator = new RedisReplicator(new File("/path/to/appendonly.aof", FileType.AOF, Configuration.defaultSetting());
Replicator replicator = new RedisReplicator(new File("/path/to/appendonly.aof", FileType.MIXED, Configuration.defaultSetting());After redis-replicator-2.4.0, We introduced a new concept(Redis URI) which simplify the construction process of RedisReplicator.
Replicator replicator = new RedisReplicator("redis://127.0.0.1:6379");
Replicator replicator = new RedisReplicator("redis:///path/to/dump.rdb");
Replicator replicator = new RedisReplicator("redis:///path/to/appendonly.aof");
// configuration setting example
Replicator replicator = new RedisReplicator("redis://127.0.0.1:6379?authPassword=foobared&readTimeout=10000&ssl=yes");
Replicator replicator = new RedisReplicator("redis:///path/to/dump.rdb?rateLimit=1000000");
Replicator replicator = new RedisReplicator("rediss://user:[email protected]:6379?rateLimit=1000000");| commands | commands | commands | commands | commands | commands |
|---|---|---|---|---|---|
| PING | APPEND | SET | SETEX | MSET | DEL |
| SADD | HMSET | HSET | LSET | EXPIRE | EXPIREAT |
| GETSET | HSETNX | MSETNX | PSETEX | SETNX | SETRANGE |
| HDEL | UNLINK | SREM | LPOP | LPUSH | LPUSHX |
| LRem | RPOP | RPUSH | RPUSHX | ZREM | ZINTERSTORE |
| INCR | DECR | INCRBY | PERSIST | SELECT | FLUSHALL |
| FLUSHDB | HINCRBY | ZINCRBY | MOVE | SMOVE | BRPOPLPUSH |
| PFCOUNT | PFMERGE | SDIFFSTORE | RENAMENX | PEXPIREAT | SINTERSTORE |
| ZADD | BITFIELD | SUNIONSTORE | RESTORE | LINSERT | ZREMRANGEBYLEX |
| GEOADD | PEXPIRE | ZUNIONSTORE | EVAL | SCRIPT | ZREMRANGEBYRANK |
| PUBLISH | BITOP | SETBIT | SWAPDB | PFADD | ZREMRANGEBYSCORE |
| RENAME | MULTI | EXEC | LTRIM | RPOPLPUSH | SORT |
| EVALSHA | ZPOPMAX | ZPOPMIN | XACK | XADD | XCLAIM |
| XDEL | XGROUP | XTRIM | XSETID | COPY | LMOVE |
| BLMOVE | ZDIFFSTORE | GEOSEARCHSTORE | FUNCTION | SPUBLISH |
- Adjust redis server setting like the following. more details please refer to redis.conf
client-output-buffer-limit slave 0 0 0WARNNING: this setting may run out of memory of redis server in some cases.
- Set log level to debug
- If you are using log4j2, add logger like the following:
<Logger name="com.moilioncircle" level="debug">
<AppenderRef ref="YourAppender"/>
</Logger> Configuration.defaultSetting().setVerbose(true);
// redis uri
"redis://127.0.0.1:6379?verbose=yes" System.setProperty("javax.net.ssl.keyStore", "/path/to/keystore");
System.setProperty("javax.net.ssl.keyStorePassword", "password");
System.setProperty("javax.net.ssl.keyStoreType", "your_type");
System.setProperty("javax.net.ssl.trustStore", "/path/to/truststore");
System.setProperty("javax.net.ssl.trustStorePassword", "password");
System.setProperty("javax.net.ssl.trustStoreType", "your_type");
Configuration.defaultSetting().setSsl(true);
// optional setting
Configuration.defaultSetting().setSslSocketFactory(sslSocketFactory);
Configuration.defaultSetting().setSslParameters(sslParameters);
Configuration.defaultSetting().setHostnameVerifier(hostnameVerifier);
// redis uri
"redis://127.0.0.1:6379?ssl=yes"
"rediss://127.0.0.1:6379" Configuration.defaultSetting().setAuthUser("default");
Configuration.defaultSetting().setAuthPassword("foobared");
// redis uri
"redis://127.0.0.1:6379?authPassword=foobared&authUser=default"
"redis://default:[email protected]:6379"- Adjust redis server setting like the following
repl-backlog-size
repl-backlog-ttl
repl-ping-slave-periodsrepl-ping-slave-period MUST less than Configuration.getReadTimeout(), default Configuration.getReadTimeout() is 60 seconds
Replicator replicator = new RedisReplicator("redis://127.0.0.1:6379");
final long start = System.currentTimeMillis();
final AtomicInteger acc = new AtomicInteger(0);
replicator.addEventListener(new EventListener() {
@Override
public void onEvent(Replicator replicator, Event event) {
if(event instanceof PreRdbSyncEvent) {
System.out.println("pre rdb sync");
} else if(event instanceof PostRdbSyncEvent) {
long end = System.currentTimeMillis();
System.out.println("time elapsed:" + (end - start));
System.out.println("rdb event count:" + acc.get());
} else {
acc.incrementAndGet();
}
}
});
replicator.open();According to 4.3. Write your own rdb parser, This tool built in an Iterable Rdb Parser so that handle huge key value pair.
More details please refer to:
[1] HugeKVFileExample.java
[2] HugeKVSocketExample.java
$cd /path/to/redis
$./utils/gen-test-certs.sh
$cd tests/tls
$openssl pkcs12 -export -CAfile ca.crt -in redis.crt -inkey redis.key -out redis.p12
$cd /path/to/redis
$./src/redis-server --tls-port 6379 --port 0 --tls-cert-file ./tests/tls/redis.crt \
--tls-key-file ./tests/tls/redis.key --tls-ca-cert-file ./tests/tls/ca.crt \
--tls-replication yes --bind 0.0.0.0 --protected-mode no
System.setProperty("javax.net.ssl.keyStore", "/path/to/redis/tests/tls/redis.p12");
System.setProperty("javax.net.ssl.keyStorePassword", "password");
System.setProperty("javax.net.ssl.keyStoreType", "pkcs12");
System.setProperty("javax.net.ssl.trustStore", "/path/to/redis/tests/tls/redis.p12");
System.setProperty("javax.net.ssl.trustStorePassword", "password");
System.setProperty("javax.net.ssl.trustStoreType", "pkcs12");
Replicator replicator = new RedisReplicator("rediss://127.0.0.1:6379");
If you don't want to use System.setProperty you can programing as following
RedisSslContextFactory factory = new RedisSslContextFactory();
factory.setKeyStorePath("/path/to/redis/tests/tls/redis.p12");
factory.setKeyStoreType("pkcs12");
factory.setKeyStorePassword("password");
factory.setTrustStorePath("/path/to/redis/tests/tls/redis.p12");
factory.setTrustStoreType("pkcs12");
factory.setTrustStorePassword("password");
SslConfiguration ssl = SslConfiguration.defaultSetting().setSslContextFactory(factory);
Replicator replicator = new RedisReplicator("rediss://127.0.0.1:6379", ssl); Replicator replicator = new RedisReplicator("redis://user:[email protected]:6379");Since redis 7.0 add function support. and function structure stored in rdb file. we can use following method to parse function.
Replicator replicator = new RedisReplicator("redis://127.0.0.1:6379");
replicator.addEventListener(new EventListener() {
@Override
public void onEvent(Replicator replicator, Event event) {
if (event instanceof Function) {
Function function = (Function) event;
function.getCode();
// your code goes here
}
}
});
replicator.open();you can also parse function to serialized data so that use FUNCTION RESTORE to restore serialized data to target redis
Replicator replicator = new RedisReplicator("redis://127.0.0.1:6379");
replicator.setRdbVisitor(new DumpRdbVisitor(replicator));
replicator.addEventListener(new EventListener() {
@Override
public void onEvent(Replicator replicator, Event event) {
if (event instanceof DumpFunction) {
DumpFunction function = (DumpFunction) event;
byte[] serialized = function.getSerialized();
// your code goes here
// you can use FUNCTION RESTORE to restore above serialized data to target redis
}
}
});
replicator.open();- Leon Chen
- Adrian Yao
- Trydofor
- Argun
- Sean Pan
- René Kerner
- Maplestoria
- Special thanks to Kevin Zheng
Commercial support for redis-replicator is available. The following services are currently available:
- Onsite consulting. $10,000 per day
- Onsite training. $10,000 per day
You may also contact Baoyi Chen directly, mail to [email protected].
- rdb.c
- Redis RDB File Format
- Redis Protocol specification
- Redis Replication
- Redis-replicator Design and Implementation
27 January 2023, A sad day that I lost my mother 宁文君, She was encouraging and supporting me in developing this tool. Every time a company uses this tool, she got excited like a child and encouraged me to keep going. Without her I couldn't have maintained this tool for so many years. Even I didn't achieve much but she is still proud of me, R.I.P and hope God bless her.
YourKit is kindly supporting this open source project with its full-featured Java Profiler.
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Java and .NET applications. Take a look at YourKit's leading software products:
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IntelliJ IDEA is a Java integrated development environment (IDE) for developing computer software.
It is developed by JetBrains (formerly known as IntelliJ), and is available as an Apache 2 Licensed community edition,
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Redisson is Redis based In-Memory Data Grid for Java offers distributed objects and services (BitSet, Set, Multimap, SortedSet, Map, List, Queue, BlockingQueue, Deque, BlockingDeque, Semaphore, Lock, AtomicLong, CountDownLatch, Publish / Subscribe, Bloom filter, Remote service, Spring cache, Executor service, Live Object service, Scheduler service) backed by Redis server. Redisson provides more convenient and easiest way to work with Redis. Redisson objects provides a separation of concern, which allows you to keep focus on the data modeling and application logic.
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