[jira] [Created] (ACCUMULO-4611) Commons Configuration either needs bumped or needs to be provided for Hadoop 3

["Michael Hogue (JIRA)" <ji...@apache.org>]

Michael Hogue created ACCUMULO-4611:
---------------------------------------

             Summary: Commons Configuration either needs bumped or needs to be provided for Hadoop 3
                 Key: ACCUMULO-4611
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4611
             Project: Accumulo
          Issue Type: Bug
    Affects Versions: 1.8.1, 1.7.2
         Environment: CentOS 7
Accumulo 1.7.x, 1.8.x
Hadoop 3.0.0-alpha 2
Zookeeper 3.4.9
            Reporter: Michael Hogue


I was investigating running either Accumulo 1.7.x or 1.8.x on Hadoop 3.0.0-alpha 2 and ran into a couple of issues. Since Accumulo assumes some dependencies will be provided by Hadoop (per ACCUMULO-1244), if those dependencies change then Accumulo might also need to change.  

HADOOP-13660 bumped {{commons-configuration}} from 1.6 -> 2.1 for Hadoop 3.0.0, and so NoClassDefFoundErrors are thrown per the below stack trace on {{accumulo init}}:

{noformat}
[mike@localhost cloud]$ accumulo init
2017-03-22 15:38:34,106 [start.Main] ERROR: Uncaught exception
java.util.ServiceConfigurationError: org.apache.accumulo.start.spi.KeywordExecutable: Provider org.apache.accumulo.proxy.Proxy could not be instantiated
    at java.util.ServiceLoader.fail(ServiceLoader.java:232)
    at java.util.ServiceLoader.access$100(ServiceLoader.java:185)
    at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:384)
    at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:404)
    at java.util.ServiceLoader$1.next(ServiceLoader.java:480)
    at org.apache.accumulo.start.Main.checkDuplicates(Main.java:223)
    at org.apache.accumulo.start.Main.getExecutables(Main.java:215)
    at org.apache.accumulo.start.Main.main(Main.java:78)
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/configuration/Configuration
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
    at java.lang.Class.getConstructor0(Class.java:3075)
    at java.lang.Class.newInstance(Class.java:412)
    at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:380)
    ... 5 more
Caused by: java.lang.ClassNotFoundException: org.apache.commons.configuration.Configuration
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at org.apache.accumulo.start.classloader.AccumuloClassLoader$2.loadClass(AccumuloClassLoader.java:284)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 10 more
{noformat}

I worked around this by dropping the {{commons-configuration}} 1.6 jar on Accumulo's classpath, but this should either be provided by Accumulo now or Accumulo should be bumped to {{commons-configuration2}} as well. Note that the latter change would cause problems for Hadoop 2 installations.

There was actually one more thing that needed added to the accumulo-site.xml in order to get Accumulo to run in Hadoop 3:

{noformat}
$HADOOP_PREFIX/share/hadoop/client/[^.].*.jar
{noformat}

The reason for this is because {{Hdfs.java}} moved from the hadoop-hdfs jar to the hadoop-client-api jar.



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