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Posted to dev@hbase.apache.org by "Josh Elser (JIRA)" <ji...@apache.org> on 2018/03/14 18:45:00 UTC
[jira] [Created] (HBASE-20201) HBase must provide commons-cli-1.4
for mapreduce jobs with H3
Josh Elser created HBASE-20201:
----------------------------------
Summary: HBase must provide commons-cli-1.4 for mapreduce jobs with H3
Key: HBASE-20201
URL: https://issues.apache.org/jira/browse/HBASE-20201
Project: HBase
Issue Type: Bug
Components: mapreduce
Reporter: Romil Choksi
Assignee: Josh Elser
Fix For: 2.0.0
Been trying to get some pre-existing mapreduce tests working against HBase2.
There's an inherent problem right now that hadoop-common depends on commons-cli-1.2 and HBase depends on commons-cli-1.4. This means that if you use {{$(hbase mapredcp)}} to submit a mapreduce job via {{hadoop jar}}, you'll get an error like:
{noformat}
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/cli/DefaultParser
at org.apache.hadoop.hbase.util.AbstractHBaseTool.isHelpCommand(AbstractHBaseTool.java:165)
at org.apache.hadoop.hbase.util.AbstractHBaseTool.run(AbstractHBaseTool.java:133)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
at org.apache.hadoop.hbase.util.AbstractHBaseTool.doStaticMain(AbstractHBaseTool.java:270)
at hbase_it.App.main(App.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.hadoop.util.RunJar.run(RunJar.java:239)
at org.apache.hadoop.util.RunJar.main(RunJar.java:153)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.cli.DefaultParser
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 11 more{noformat}
My guess is that in previous versions, we didn't have this conflict with Hadoop (we were on the same version). Now, we're not.
I see two routes:
# We just alter the mapredcp to include our "correct" commons-cli-1.4 on the classpath and remind users to make use of the {{HADOOP_USER_CLASSPATH_FIRST}} environment variable
# We put commons-cli into our hbase-thirdparty and stop using it directly.
The former is definitely quicker, but I'm guessing the latter would insulate us more nicely.
Thoughts, [~stack], [~busbey], [~mdrob] (and others who have done H3 work?)
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