我正在按照快速入门的小节“将 Gobblin 作为守护进程运行”来学习 gobblin。
我按照指南一步一步地做：
- 创建配置目录并设置环境变量GOBBLIN_JOB_CONFIG_DIR，并将wikipedia.pull放入其中；
- 创建工作目录并设置环境变量 GOBBLIN_WORK_DIR。
- 启动 Gobblin：./bin/gobblin-standalone.sh start
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 $GOBBLIN_JOB_CONFIG_DIR/*
/Users/floyd/plugin/gobblin-dist/config_dir/wikipedia.pull我在日志中得到了异常：
1 2017-10-18 16:29:43 CST INFO [main] gobblin.runtime.app.ServiceBasedAppLauncher 163 - Starting the Gobblin application and all its associated Services
2 2017-10-18 16:29:43 CST INFO [JobScheduler STARTING] gobblin.scheduler.JobScheduler 179 - Starting the job scheduler
3 2017-10-18 16:29:43 CST INFO [SchedulerService STARTING] org.quartz.impl.StdSchedulerFactory 1172 - Using default implementation for ThreadExecutor
4 2017-10-18 16:29:43 CST INFO [SchedulerService STARTING] org.quartz.core.SchedulerSignalerImpl 61 - Initialized Scheduler Signaller of type: class org.quar tz.core.SchedulerSignalerImpl
5 2017-10-18 16:29:43 CST INFO [SchedulerService STARTING] org.quartz.core.QuartzScheduler 240 - Quartz Scheduler v.2.2.3 created.
6 2017-10-18 16:29:43 CST INFO [SchedulerService STARTING] org.quartz.simpl.RAMJobStore 155 - RAMJobStore initialized.
7 2017-10-18 16:29:43 CST INFO [SchedulerService STARTING] org.quartz.core.QuartzScheduler 305 - Scheduler meta-data: Quartz Scheduler (v2.2.3) 'LocalJobSche duler' with instanceId 'NON_CLUSTERED'
8 Scheduler class: 'org.quartz.core.QuartzScheduler' - running locally.
9 NOT STARTED.
10 Currently in standby mode.
11 Number of jobs executed: 0
12 Using thread pool 'org.quartz.simpl.SimpleThreadPool' - with 3 threads.
13 Using job-store 'org.quartz.simpl.RAMJobStore' - which does not support persistence. and is not clustered.
14
15 2017-10-18 16:29:43 CST INFO [SchedulerService STARTING] org.quartz.impl.StdSchedulerFactory 1327 - Quartz scheduler 'LocalJobScheduler' initialized from s pecified file: '/Users/fanjun/plugin/gobblin-dist/conf/quartz.properties'
16 2017-10-18 16:29:43 CST INFO [SchedulerService STARTING] org.quartz.impl.StdSchedulerFactory 1331 - Quartz scheduler version: 2.2.3
17 2017-10-18 16:29:43 CST INFO [SchedulerService STARTING] org.quartz.core.QuartzScheduler 575 - Scheduler LocalJobScheduler_$_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)并且 wikipedia.pull 是从 github 复制的：
#
# 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