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?) -- This message was sent by Atlassian JIRA (v7.6.3#76005)