Harsh J created FLUME-1992:
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Summary: ElasticSearch dependency is marked optional
Key: FLUME-1992
URL: https://issues.apache.org/jira/browse/FLUME-1992
Project: Flume
Issue Type: Improvement
Components: Sinks+Sources
Affects Versions: v1.4.0
Reporter: Harsh J
Priority: Minor
FLUME-1371 added an ElasticSearch module but the dependency added in it for
org.elasticsearch classes is marked {{<optional>true</optional>}}.
This means it doesn't get generated into the builds Flume would ship and the
user guide will not work unless a user manually places their version of
ElasticSearch jars on the classpath. They will get the error:
{code}
java.lang.NoClassDefFoundError:
org/elasticsearch/common/transport/TransportAddress
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:188)
at
org.apache.flume.sink.DefaultSinkFactory.getClass(DefaultSinkFactory.java:67)
at
org.apache.flume.sink.DefaultSinkFactory.create(DefaultSinkFactory.java:41)
at
org.apache.flume.node.AbstractConfigurationProvider.loadSinks(AbstractConfigurationProvider.java:415)
at
org.apache.flume.node.AbstractConfigurationProvider.getConfiguration(AbstractConfigurationProvider.java:103)
at
org.apache.flume.node.PollingPropertiesFileConfigurationProvider$FileWatcherRunnable.run(PollingPropertiesFileConfigurationProvider.java:140)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at
java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:165)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:267)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:679)
Caused by: java.lang.ClassNotFoundException:
org.elasticsearch.common.transport.TransportAddress
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
... 15 more
{code}
Two ways to address this; either we:
# Mark dependency as non-optional, supply a bundled elasticsearch jar (version
decision could be a problem I imagine, if their releases break compatibility
often)
# Update the user guide to instruct the user to place the jar onto flume's
classpath in proper manner, before following the remaining of the guide.
Problem of the ClassNotFound originally reported by user j0sh_X over FreeNode
IRC.
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