Gobblin快速入门示例异常：ClassNotFoundException：org.apache.gobblin.example.wikipedia.WikipediaSource

Question

我正在学习gobblin，后面的quickstart子节“将Gobblin作为守护进程运行”。

我这样做，一步一步的指导：

1. 创建配置目录，并设置环境变量GOBBLIN_JOB_CONFIG_DIR，并把wikipedia.pull在它;
2. 创建工作目录并设置环境变量GOBBLIN_WORK_DIR。
3. 启动Gobblin：./bin/gobblin-standalone.sh开始

floyddeMac-mini:gobblin-dist floyd$ echo $GOBBLIN_JOB_CONFIG_DIR 
 
    /Users/floyd/plugin/gobblin-dist/config_dir 
 

 
    floyddeMac-mini:gobblin-dist floyd$ echo $GOBBLIN_WORK_DIR 
 
    /Users/floyd/plugin/gobblin-dist/work_dir 
 

 
    floyddeMac-mini:gobblin-dist floyd$ echo $JAVA_HOME 
 
    /Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home 
 

 
    floyddeMac-mini:gobblin-dist floyd$ ls $GOBBLIN_JOB_CONFIG_DIR/* 
 
    /Users/floyd/plugin/gobblin-dist/config_dir/wikipedia.pull

我在日志中的例外：

1 2017-10-18 16:29:43 CST INFO [main] gobblin.runtime.app.ServiceBasedAppLauncher 163 - Starting the Gobblin application and all its associated Services 
 
    2 2017-10-18 16:29:43 CST INFO [JobScheduler STARTING] gobblin.scheduler.JobScheduler 179 - Starting the job scheduler 
 
    3 2017-10-18 16:29:43 CST INFO [SchedulerService STARTING] org.quartz.impl.StdSchedulerFactory 1172 - Using default implementation for ThreadExecutor 
 
    4 2017-10-18 16:29:43 CST INFO [SchedulerService STARTING] org.quartz.core.SchedulerSignalerImpl 61 - Initialized Scheduler Signaller of type: class org.quar tz.core.SchedulerSignalerImpl 
 
    5 2017-10-18 16:29:43 CST INFO [SchedulerService STARTING] org.quartz.core.QuartzScheduler 240 - Quartz Scheduler v.2.2.3 created. 
 
    6 2017-10-18 16:29:43 CST INFO [SchedulerService STARTING] org.quartz.simpl.RAMJobStore 155 - RAMJobStore initialized. 
 
    7 2017-10-18 16:29:43 CST INFO [SchedulerService STARTING] org.quartz.core.QuartzScheduler 305 - Scheduler meta-data: Quartz Scheduler (v2.2.3) 'LocalJobSche duler' with instanceId 'NON_CLUSTERED' 
 
    8 Scheduler class: 'org.quartz.core.QuartzScheduler' - running locally. 
 
    9 NOT STARTED. 
 
10 Currently in standby mode. 
 
11 Number of jobs executed: 0 
 
12 Using thread pool 'org.quartz.simpl.SimpleThreadPool' - with 3 threads. 
 
13 Using job-store 'org.quartz.simpl.RAMJobStore' - which does not support persistence. and is not clustered. 
 
14 
 
15 2017-10-18 16:29:43 CST INFO [SchedulerService STARTING] org.quartz.impl.StdSchedulerFactory 1327 - Quartz scheduler 'LocalJobScheduler' initialized from s pecified file: '/Users/fanjun/plugin/gobblin-dist/conf/quartz.properties' 
 
16 2017-10-18 16:29:43 CST INFO [SchedulerService STARTING] org.quartz.impl.StdSchedulerFactory 1331 - Quartz scheduler version: 2.2.3 
 
17 2017-10-18 16:29:43 CST INFO [SchedulerService STARTING] org.quartz.core.QuartzScheduler 575 - Scheduler LocalJobScheduler_$_NON_CLUSTERED started. 
 
18 2017-10-18 16:29:44 CST WARN [JobScheduler STARTING] org.apache.hadoop.util.NativeCodeLoader 62 - Unable to load native-hadoop library for your platform...  using builtin-java classes where applicable 
 
19 2017-10-18 16:29:44 CST INFO [JobScheduler STARTING] gobblin.scheduler.JobScheduler 413 - Scheduling configured jobs 
 
20 2017-10-18 16:29:44 CST INFO [JobScheduler STARTING] gobblin.scheduler.JobScheduler 427 - Loaded 1 job configurations 
 
21 2017-10-18 16:29:44 CST INFO [JobScheduler-0] gobblin.util.ClustersNames 74 - no default cluster mapping found 
 
22 2017-10-18 16:29:44 CST WARN [JobScheduler-0] gobblin.runtime.AbstractJobLauncher 200 - Creating a job specific SharedResourcesBroker. Objects will only be  shared at the job level. 
 
23 2017-10-18 16:29:45 CST INFO [JobScheduler-0] org.reflections.Reflections 229 - Reflections took 466 ms to scan 43 urls, producing 645 keys and 2317 values 
 
24 2017-10-18 16:29:45 CST INFO [JobScheduler-0] gobblin.util.reflection.GobblinConstructorUtils 86 - Found accessible constructor for class class gobblin.run time.FsDatasetStateStore with parameter types [class org.apache.hadoop.fs.LocalFileSystem, class java.lang.String, class java.lang.Integer, class com.google. common.cache.LocalCache$LocalLoadingCache]. 
 
25 2017-10-18 16:29:45 CST WARN [JobScheduler-0] gobblin.runtime.JobContext 298 - Property task.data.root.dir is missing. 
 
26 2017-10-18 16:29:45 CST ERROR [JobScheduler-0] gobblin.scheduler.JobScheduler$NonScheduledJobRunner 519 - Failed to run job PullFromWikipedia 
 
27 gobblin.runtime.JobException: Failed to run job PullFromWikipedia 
 
28  at gobblin.scheduler.JobScheduler.runJob(JobScheduler.java:352) 
 
29  at gobblin.scheduler.JobScheduler$NonScheduledJobRunner.run(JobScheduler.java:517) 
 
30  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
 
31  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
 
32  at java.lang.Thread.run(Thread.java:745) 
 
33 Caused by: java.lang.RuntimeException: Failed to create job launcher: java.lang.ClassNotFoundException: org.apache.gobblin.example.wikipedia.WikipediaSource 
 
34  at gobblin.runtime.JobLauncherFactory.newJobLauncher(JobLauncherFactory.java:120) 
 
35  at gobblin.runtime.JobLauncherFactory.newJobLauncher(JobLauncherFactory.java:85) 
 
36  at gobblin.runtime.JobLauncherFactory.newJobLauncher(JobLauncherFactory.java:65) 
 
37  at gobblin.scheduler.JobScheduler.runJob(JobScheduler.java:350) 
 
38  ... 4 more 
 
39 Caused by: java.lang.ClassNotFoundException: org.apache.gobblin.example.wikipedia.WikipediaSource 
 
40  at java.net.URLClassLoader.findClass(URLClassLoader.java:381) 
 
41  at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 
 
42  at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) 
 
43  at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

和wikipedia.pull是从GitHub复制：

# 
 
# Licensed to the Apache Software Foundation (ASF) under one or more 
 
# contributor license agreements. See the NOTICE file distributed with 
 
# this work for additional information regarding copyright ownership. 
 
# The ASF licenses this file to You under the Apache License, Version 2.0 
 
# (the "License"); you may not use this file except in compliance with 
 
# the License. You may obtain a copy of the License at 
 
# 
 
# http://www.apache.org/licenses/LICENSE-2.0 
 
# 
 
# Unless required by applicable law or agreed to in writing, software 
 
# distributed under the License is distributed on an "AS IS" BASIS, 
 
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 
# See the License for the specific language governing permissions and 
 
# limitations under the License. 
 
# 
 

 
job.name=PullFromWikipedia 
 
job.group=Wikipedia 
 
job.description=A getting started example for Gobblin 
 

 
source.class=org.apache.gobblin.example.wikipedia.WikipediaSource 
 
source.page.titles=LinkedIn,Wikipedia:Sandbox 
 
source.revisions.cnt=5 
 

 
wikipedia.api.rooturl=https://en.wikipedia.org/w/api.php 
 
wikipedia.avro.schema={"namespace": "example.wikipedia.avro","type": "record","name": "WikipediaArticle","fields": [{"name": "revid", "type": ["double", "null"]},{"name": "pageid", "type": ["double", "null"]},{"name": "title", "type": ["string", "null"]},{"name": "user", "type": ["string", "null"]},{"name": "anon", "type": ["string", "null"]},{"name": "userid", "type": ["double", "null"]},{"name": "timestamp", "type": ["string", "null"]},{"name": "size", "type": ["double", "null"]},{"name": "contentformat", "type": ["string", "null"]},{"name": "contentmodel", "type": ["string", "null"]},{"name": "content", "type": ["string", "null"]}]} 
 
gobblin.wikipediaSource.maxRevisionsPerPage=10 
 

 
converter.classes=org.apache.gobblin.example.wikipedia.WikipediaConverter 
 

 
extract.namespace=org.apache.gobblin.example.wikipedia 
 

 
writer.destination.type=HDFS 
 
writer.output.format=AVRO 
 
writer.partitioner.class=org.apache.gobblin.example.wikipedia.WikipediaPartitioner 
 

 
data.publisher.type=org.apache.gobblin.publisher.BaseDataPublisher

Answer 1

您需要从wikipedia.pull.Run一遍所有的定义中删除前缀org.apache，它会工作。