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https://issues.apache.org/jira/browse/HBASE-20201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16399176#comment-16399176
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Josh Elser commented on HBASE-20201:
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Best as I can tell for H2, we'd be broken in the same manner as we are for H3.
I can only guess that the reason we haven't seen this previously is due to jobs
that don't use the AbstractHBaseTool (admittedly, I'm surprised we haven't seen
it yet).
> 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
> Priority: Blocker
> 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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