hazelcast-jet 是hazelcast 团队开源的分布式流以及批处理框架，相比一些其他流以及批处理框架来说，只需要依赖jar包（Siddhi 也是不错的选择）
当然hazelcast-jet 同时支持流处理以及批处理，其他的一些stream 处理的平台（工具）streamsets，apache nifi 相对复杂了，而且很多时候我们
并需要这么复杂的东西，kafka stream 就相对只是kafaka 的生态了，很多时候也复杂化了系统的开发
以下是一个简单的学习试用
maven 项目
- 目录结构
├── pom.xml
└── src
├── main
│ ├── java
│ │ └── com
│ │ └── dalong
│ │ ├── Application.java
│ │
│ └── resources
│ └── mybooks
│ └── books
- pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.dalong</groupId>
<artifactId>myid</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<encoding>UTF-8</encoding>
<java.version>1.8</java.version>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>com.hazelcast.jet</groupId>
<artifactId>hazelcast-jet</artifactId>
<version>4.1</version>
</dependency>
</dependencies>
</project>
- 文本内
demo
app
rong
fengliang
rong
demo
app
rong
rong
- batch 模式
package com.dalong;
import com.hazelcast.jet.Jet;
import com.hazelcast.jet.JetInstance;
import com.hazelcast.jet.Traversers;
import com.hazelcast.jet.aggregate.AggregateOperations;
import com.hazelcast.jet.pipeline.Pipeline;
import com.hazelcast.jet.pipeline.Sinks;
import com.hazelcast.jet.pipeline.Sources;
import com.hazelcast.jet.pipeline.WindowDefinition;
public class Application {
public static void main(String[] args) {
String path = "src/main/resources/mybooks";
// batch mode
BatchMode(path);
// stream mode
// StreamMode(path);
}
//
private static void StreamMode(String path) {
JetInstance jet = Jet.bootstrappedInstance();
Pipeline p = Pipeline.create();
p.readFrom(Sources.fileWatcher(path))
.withIngestionTimestamps()
.setLocalParallelism(1)
.flatMap(line -> Traversers.traverseArray(line.toLowerCase().split("\\W+")))
.filter(word -> !word.isEmpty())
.groupingKey(word -> word)
.window(WindowDefinition.tumbling(4))
.aggregate(AggregateOperations.counting())
.writeTo(Sinks.logger());
jet.newJob(p).join();
}
private static void BatchMode(String path) {
JetInstance jet = Jet.bootstrappedInstance();
Pipeline p = Pipeline.create();
p.readFrom(Sources.files(path))
.flatMap(line -> Traversers.traverseArray(line.toLowerCase().split("\W+")))
.filter(word -> !word.isEmpty())
.groupingKey(word -> word)
.aggregate(AggregateOperations.counting())
.writeTo(Sinks.logger());
jet.newJob(p).join();
}
}
效果
14:18:02.150 [ INFO] [c.h.j.Jet] Bootstrapped instance requested but application wasn't called from jet submit script. Creating a standalone Jet instance instead.
14:18:02.278 [ INFO] [c.h.i.c.AbstractConfigLocator] Loading 'hazelcast-jet-default.yaml' from the classpath.
14:18:02.299 [ INFO] [c.h.j.c.JetConfig] jet.home is /Users/dalong/Downloads/myid
14:18:02.761 [ INFO] [c.h.i.c.AbstractConfigLocator] Loading 'hazelcast-jet-member-default.yaml' from the classpath.
14:18:03.017 [ INFO] [c.h.i.AddressPicker] Prefer IPv4 stack is true, prefer IPv6 addresses is false
14:18:03.078 [ INFO] [c.h.i.AddressPicker] Picked [10.6.205.88]:5701, using socket ServerSocket[addr=/0:0:0:0:0:0:0:0,localport=5701], bind any local is true
14:18:03.186 [ INFO] [c.h.system] Hazelcast Jet 4.2 (20200714 - 0e841ef) starting at [10.6.205.88]:5701
14:18:03.188 [ INFO] [c.h.system] Cluster name: jet
14:18:03.189 [ INFO] [c.h.system]
o o o o---o o---o o o---o o o---o o-o-o o o---o o-o-o
| | / / | | | / | | | | |
o---o o---o o o-o | o o---o o---o | | o-o |
| | | | / | | | | | | | | | |
o o o o o---o o---o o---o o---o o o o---o o o--o o---o o
14:18:03.191 [ INFO] [c.h.system] Copyright (c) 2008-2020, Hazelcast, Inc. All Rights Reserved.
14:18:04.425 [ INFO] [c.h.s.i.o.i.BackpressureRegulator] Backpressure is disabled
14:18:05.926 [ WARN] [c.h.c.CPSubsystem] CP Subsystem is not enabled. CP data structures will operate in UNSAFE mode! Please note that UNSAFE mode will not provide strong consistency guarantees.
14:18:07.140 [ INFO] [c.h.j.i.e.TaskletExecutionService] Creating idler with jet.idle.cooperative.min.microseconds=25µs,jet.idle.cooperative.max.microseconds=500µs
14:18:07.143 [ INFO] [c.h.j.i.e.TaskletExecutionService] Creating idler with jet.idle.noncooperative.min.microseconds=25µs,jet.idle.noncooperative.max.microseconds=5000µs
14:18:07.373 [ INFO] [c.h.j.i.JetService] Setting number of cooperative threads and default parallelism to 8
14:18:07.386 [ INFO] [c.h.s.i.o.i.OperationExecutorImpl] Starting 8 partition threads and 5 generic threads (1 dedicated for priority tasks)
14:18:07.391 [ INFO] [c.h.i.d.Diagnostics] Diagnostics disabled. To enable add -Dhazelcast.diagnostics.enabled=true to the JVM arguments.
14:18:07.416 [ INFO] [c.h.c.LifecycleService] [10.6.205.88]:5701 is STARTING
14:18:07.487 [ WARN] [c.h.i.i.Node] No join method is enabled! Starting standalone.
14:18:07.534 [ INFO] [c.h.c.LifecycleService] [10.6.205.88]:5701 is STARTED
14:18:22.713 [ INFO] [c.h.i.p.i.PartitionStateManager] Initializing cluster partition table arrangement
14:18:22.910 [ INFO] [c.h.j.i.JobCoordinationService] Starting job 04a8-86cc-9300-0001 based on submit request
14:18:22.930 [ INFO] [c.h.j.i.MasterJobContext] Didn't find any snapshot to restore for job '04a8-86cc-9300-0001', execution 04a8-86cc-9301-0001
14:18:22.931 [ INFO] [c.h.j.i.MasterJobContext] Start executing job '04a8-86cc-9300-0001', execution 04a8-86cc-9301-0001, execution graph in DOT format:
digraph DAG {
"filesSource(src/main/resources/mybooks/*)" [localParallelism=4];
"fused(flat-map, filter)" [localParallelism=8];
"group-and-aggregate-prepare" [localParallelism=8];
"group-and-aggregate" [localParallelism=8];
"loggerSink" [localParallelism=1];
"filesSource(src/main/resources/mybooks/*)" -> "fused(flat-map, filter)" [queueSize=1024];
"fused(flat-map, filter)" -> "group-and-aggregate-prepare" [label="partitioned", queueSize=1024];
subgraph cluster_0 {
"group-and-aggregate-prepare" -> "group-and-aggregate" [label="distributed-partitioned", queueSize=1024];
}
"group-and-aggregate" -> "loggerSink" [queueSize=1024];
}
HINT: You can use graphviz or http://viz-js.com to visualize the printed graph.
14:18:23.050 [ INFO] [c.h.j.i.JobExecutionService] Execution plan for jobId=04a8-86cc-9300-0001, jobName='04a8-86cc-9300-0001', executionId=04a8-86cc-9301-0001 initialized
14:18:23.056 [ INFO] [c.h.j.i.JobExecutionService] Start execution of job '04a8-86cc-9300-0001', execution 04a8-86cc-9301-0001 from coordinator [10.6.205.88]:5701
14:18:23.113 [ INFO] [c.h.j.i.c.W.loggerSink#0] rong=4
14:18:23.114 [ INFO] [c.h.j.i.c.W.loggerSink#0] fengliang=1
14:18:23.114 [ INFO] [c.h.j.i.c.W.loggerSink#0] app=2
14:18:23.114 [ INFO] [c.h.j.i.c.W.loggerSink#0] demo=2
14:18:23.121 [ INFO] [c.h.j.i.MasterJobContext] Execution of job '04a8-86cc-9300-0001', execution 04a8-86cc-9301-0001 completed successfully
Start time: 2020-07-15T14:18:22.912
Duration: 208 ms
To see additional job metrics enable JobConfig.storeMetricsAfterJobCompletion
- stream 模式
注意运行模式，需要先启动，然后创建一个文件，填充部分内容，然后就可以看到内容了，同时取消对于streamMpde
public static void main(String[] args) {
String path = "src/main/resources/mybooks";
// batch mode
// BatchMode(path);
// stream mode
StreamMode(path);
}
效果
14:59:23.648 [ INFO] [c.h.j.Jet] Bootstrapped instance requested but application wasn't called from jet submit script. Creating a standalone Jet instance instead.
14:59:23.733 [ INFO] [c.h.i.c.AbstractConfigLocator] Loading 'hazelcast-jet-default.yaml' from the classpath.
14:59:23.737 [ INFO] [c.h.j.c.JetConfig] jet.home is /Users/dalong/Downloads/myid
14:59:24.023 [ INFO] [c.h.i.c.AbstractConfigLocator] Loading 'hazelcast-jet-member-default.yaml' from the classpath.
14:59:24.116 [ INFO] [c.h.i.AddressPicker] Prefer IPv4 stack is true, prefer IPv6 addresses is false
14:59:24.156 [ INFO] [c.h.i.AddressPicker] Picked [10.6.205.88]:5701, using socket ServerSocket[addr=/0:0:0:0:0:0:0:0,localport=5701], bind any local is true
14:59:24.203 [ INFO] [c.h.system] Hazelcast Jet 4.2 (20200714 - 0e841ef) starting at [10.6.205.88]:5701
14:59:24.204 [ INFO] [c.h.system] Cluster name: jet
14:59:24.205 [ INFO] [c.h.system]
o o o o---o o---o o o---o o o---o o-o-o o o---o o-o-o
| | / / | | | / | | | | |
o---o o---o o o-o | o o---o o---o | | o-o |
| | | | / | | | | | | | | | |
o o o o o---o o---o o---o o---o o o o---o o o--o o---o o
14:59:24.205 [ INFO] [c.h.system] Copyright (c) 2008-2020, Hazelcast, Inc. All Rights Reserved.
14:59:24.523 [ INFO] [c.h.s.i.o.i.BackpressureRegulator] Backpressure is disabled
14:59:24.830 [ WARN] [c.h.c.CPSubsystem] CP Subsystem is not enabled. CP data structures will operate in UNSAFE mode! Please note that UNSAFE mode will not provide strong consistency guarantees.
14:59:25.218 [ INFO] [c.h.j.i.e.TaskletExecutionService] Creating idler with jet.idle.cooperative.min.microseconds=25µs,jet.idle.cooperative.max.microseconds=500µs
14:59:25.219 [ INFO] [c.h.j.i.e.TaskletExecutionService] Creating idler with jet.idle.noncooperative.min.microseconds=25µs,jet.idle.noncooperative.max.microseconds=5000µs
14:59:25.281 [ INFO] [c.h.j.i.JetService] Setting number of cooperative threads and default parallelism to 8
14:59:25.285 [ INFO] [c.h.s.i.o.i.OperationExecutorImpl] Starting 8 partition threads and 5 generic threads (1 dedicated for priority tasks)
14:59:25.287 [ INFO] [c.h.i.d.Diagnostics] Diagnostics disabled. To enable add -Dhazelcast.diagnostics.enabled=true to the JVM arguments.
14:59:25.297 [ INFO] [c.h.c.LifecycleService] [10.6.205.88]:5701 is STARTING
14:59:25.322 [ WARN] [c.h.i.i.Node] No join method is enabled! Starting standalone.
14:59:25.336 [ INFO] [c.h.c.LifecycleService] [10.6.205.88]:5701 is STARTED
14:59:25.562 [ INFO] [c.h.i.p.i.PartitionStateManager] Initializing cluster partition table arrangement
14:59:25.685 [ INFO] [c.h.j.i.JobCoordinationService] Starting job 04a8-9031-ad80-0001 based on submit request
14:59:25.700 [ INFO] [c.h.j.i.MasterJobContext] Didn't find any snapshot to restore for job '04a8-9031-ad80-0001', execution 04a8-9031-ad81-0001
14:59:25.700 [ INFO] [c.h.j.i.MasterJobContext] Start executing job '04a8-9031-ad80-0001', execution 04a8-9031-ad81-0001, execution graph in DOT format:
digraph DAG {
"fileWatcherSource(src/main/resources/mybooks/*)" [localParallelism=1];
"fileWatcherSource(src/main/resources/mybooks/*)-add-timestamps" [localParallelism=1];
"fused(flat-map, filter)" [localParallelism=8];
"sliding-window-prepare" [localParallelism=8];
"sliding-window" [localParallelism=8];
"loggerSink" [localParallelism=1];
"fileWatcherSource(src/main/resources/mybooks/*)" -> "fileWatcherSource(src/main/resources/mybooks/*)-add-timestamps" [label="isolated", queueSize=1024];
"fileWatcherSource(src/main/resources/mybooks/*)-add-timestamps" -> "fused(flat-map, filter)" [queueSize=1024];
"fused(flat-map, filter)" -> "sliding-window-prepare" [label="partitioned", queueSize=1024];
subgraph cluster_0 {
"sliding-window-prepare" -> "sliding-window" [label="distributed-partitioned", queueSize=1024];
}
"sliding-window" -> "loggerSink" [queueSize=1024];
}
HINT: You can use graphviz or http://viz-js.com to visualize the printed graph.
14:59:25.838 [ INFO] [c.h.j.i.JobExecutionService] Execution plan for jobId=04a8-9031-ad80-0001, jobName='04a8-9031-ad80-0001', executionId=04a8-9031-ad81-0001 initialized
14:59:25.856 [ INFO] [c.h.j.i.JobExecutionService] Start execution of job '04a8-9031-ad80-0001', execution 04a8-9031-ad81-0001 from coordinator [10.6.205.88]:5701
14:59:25.935 [ INFO] [c.h.j.i.c.S.fileWatcherSource(src/main/resources/mybooks/*)#0] Started to watch directory: src/main/resources/mybooks
14:59:41.981 [ INFO] [c.h.j.i.c.W.loggerSink#0] KeyedWindowResult{start=14:59:41.936, end=14:59:41.940, key='rong', value='21', isEarly=false}
14:59:41.982 [ INFO] [c.h.j.i.c.W.loggerSink#0] KeyedWindowResult{start=14:59:41.936, end=14:59:41.940, key='fengliang', value='3', isEarly=false}
14:59:41.982 [ INFO] [c.h.j.i.c.W.loggerSink#0] KeyedWindowResult{start=14:59:41.936, end=14:59:41.940, key='app', value='7', isEarly=false}
14:59:41.982 [ INFO] [c.h.j.i.c.W.loggerSink#0] KeyedWindowResult{start=14:59:41.936, end=14:59:41.940, key='emo', value='3', isEarly=false}
14:59:41.983 [ INFO] [c.h.j.i.c.W.loggerSink#0] KeyedWindowResult{start=14:59:41.936, end=14:59:41.940, key='dmo', value='3', isEarly=false}
14:59:41.983 [ INFO] [c.h.j.i.c.W.loggerSink#0] KeyedWindowResult{start=14:59:41.936, end=14:59:41.940, key='demo', value='22', isEarly=false}
支持的特性
- 低延迟
- 零依赖
- 云原生支持
- 弹性
- 容错
- 内存存储
- 支持多种source以及sink kafka cdc，jdbc,redis...
- 动态节点发现
说明
hazelcast-jet 的好多特性，当然和hazelcast自身在搞分布式cache上的工业实践有关系，比如分布式内存存储，动态发现。。。
参考资料
https://jet-start.sh/
https://github.com/hazelcast/hazelcast-jet
https://github.com/siddhi-io/siddhi
https://github.com/espertechinc/esper