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https://issues.apache.org/jira/browse/FLUME-1179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268756#comment-13268756
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Hari Shreedharan commented on FLUME-1179:
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I have seen this happen in other cases too. Basically if it cannot find the
hadoop jar, when Class.forName() tries to create the class object for a class
which has members which are from the hadoop jar, a NoClassDefFoundError is
thrown(Class.forName throws a NoClassDefFoundError if it cant find the class
for something defined inside a class it is trying to create the class object
for - it throws a ClassNotFoundException if it can't find the class whose class
object it is trying to load) . If you run it in a debugger, you can see that
this causes the code to jump to the finally block in
PropertiesFileConfigurationProvider#load(), and exits the function, and then
nothing happens, not even the polling of the configuration file.
This happens if anything that has a hadoop supplied class's object inside
another class and the hadoop jar isn't in class path or can't be found.
RecoverableMemoryChannel is an example - take a look at FLUME-1137.
> flume-ng script silently fails if HADOOP_HOME isn't absolute
> ------------------------------------------------------------
>
> Key: FLUME-1179
> URL: https://issues.apache.org/jira/browse/FLUME-1179
> Project: Flume
> Issue Type: Bug
> Affects Versions: v1.1.0
> Reporter: E. Sammer
>
> Running bin/flume-ng fails silently if you specify HADOOP_HOME as a relative
> path (and you're using the HDFS sink). After configuration, the agent just
> blocks. It has something to do with the way the path is resolved. Very
> strange. I don't have time to debug right now, but I didn't want to lose this.
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