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From Roger Whitcomb <Roger.Whitc...@actian.com>
Subject Which Hadoop 2.x .jars are necessary for Apache Commons VFS HDFS access?
Date Fri, 11 Apr 2014 20:20:06 GMT
Hi,
I'm fairly new to Hadoop, but not to Apache, and I'm having a newbie kind of issue browsing
HDFS files.  I have written an Apache Commons VFS (Virtual File System) browser for the Apache
Pivot GUI framework (I'm the PMC Chair for Pivot: full disclosure).  And now I'm trying to
get this browser to work with HDFS to do HDFS browsing from our application.  I'm running
into a problem, which seems sort of basic, so I thought I'd ask here...

So, I downloaded Hadoop 2.3.0 from one of the mirrors, and was able to track down sort of
the minimum set of .jars necessary to at least (try to) connect using Commons VFS 2.1:
commons-collections-3.2.1.jar
commons-configuration-1.6.jar
commons-lang-2.6.jar
commons-vfs2-2.1-SNAPSHOT.jar
guava-11.0.2.jar
hadoop-auth-2.3.0.jar
hadoop-common-2.3.0.jar
log4j-1.2.17.jar
slf4j-api-1.7.5.jar
slf4j-log4j12-1.7.5.jar

What's happening now is that I instantiated the HdfsProvider this way:
	private static DefaultFileSystemManager manager = null;

	static
	{
	    manager = new DefaultFileSystemManager();
	    try {
		manager.setFilesCache(new DefaultFilesCache());
		manager.addProvider("hdfs", new HdfsFileProvider());
		manager.setFileContentInfoFactory(new FileContentInfoFilenameFactory());
		manager.setFilesCache(new SoftRefFilesCache());
		manager.setReplicator(new DefaultFileReplicator());
		manager.setCacheStrategy(CacheStrategy.ON_RESOLVE);
		manager.init();
	    }
	    catch (final FileSystemException e) {
		throw new RuntimeException(Intl.getString("object#manager.setupError"), e);
	    }
	}

Then, I try to browse into an HDFS system this way:
	    String url = String.format("hdfs://%1$s:%2$d/%3$s", "hadoop-master ", 50070, hdfsPath);
	    return manager.resolveFile(url);

Note: the client is running on Windows 7 (but could be any system that runs Java), and the
target has been one of several Hadoop clusters on Ubuntu VMs (basically the same thing happens
no matter which Hadoop installation I try to hit).  So I'm guessing the problem is in my client
configuration.

This attempt to basically just connect to HDFS results in a bunch of error messages in the
log file, which looks like it is trying to do user validation on the local machine instead
of against the Hadoop (remote) cluster.
Apr 11,2014 18:27:38.640 GMT T[AWT-EventQueue-0](26) DEBUG FileObjectManager: Trying to resolve
file reference 'hdfs://hadoop-master:50070/'
Apr 11,2014 18:27:38.953 GMT T[AWT-EventQueue-0](26)  INFO org.apache.hadoop.conf.Configuration.deprecation:
fs.default.name is deprecated. Instead, use fs.defaultFS
Apr 11,2014 18:27:39.078 GMT T[AWT-EventQueue-0](26) DEBUG MutableMetricsFactory: field org.apache.hadoop.metrics2.lib.MutableRate
org.apache.hadoop.security.UserGroupInformation$UgiMetrics.loginSuccess with annotation @org.apache.hadoop.metrics2.annotation.Metric(valueName=Time,
value=[Rate of successful kerberos logins and latency (milliseconds)], about=, type=DEFAULT,
always=false, sampleName=Ops)
Apr 11,2014 18:27:39.094 GMT T[AWT-EventQueue-0](26) DEBUG MutableMetricsFactory: field org.apache.hadoop.metrics2.lib.MutableRate
org.apache.hadoop.security.UserGroupInformation$UgiMetrics.loginFailure with annotation @org.apache.hadoop.metrics2.annotation.Metric(valueName=Time,
value=[Rate of failed kerberos logins and latency (milliseconds)], about=, type=DEFAULT, always=false,
sampleName=Ops)
Apr 11,2014 18:27:39.094 GMT T[AWT-EventQueue-0](26) DEBUG MutableMetricsFactory: field org.apache.hadoop.metrics2.lib.MutableRate
org.apache.hadoop.security.UserGroupInformation$UgiMetrics.getGroups with annotation @org.apache.hadoop.metrics2.annotation.Metric(valueName=Time,
value=[GetGroups], about=, type=DEFAULT, always=false, sampleName=Ops)
Apr 11,2014 18:27:39.094 GMT T[AWT-EventQueue-0](26) DEBUG MetricsSystemImpl: UgiMetrics,
User and group related metrics
Apr 11,2014 18:27:39.344 GMT T[AWT-EventQueue-0](26) DEBUG Groups:  Creating new Groups object
Apr 11,2014 18:27:39.344 GMT T[AWT-EventQueue-0](26) DEBUG NativeCodeLoader: Trying to load
the custom-built native-hadoop library...
Apr 11,2014 18:27:39.360 GMT T[AWT-EventQueue-0](26) DEBUG NativeCodeLoader: Failed to load
native-hadoop with error: java.lang.UnsatisfiedLinkError: no hadoop in java.library.path
Apr 11,2014 18:27:39.360 GMT T[AWT-EventQueue-0](26) DEBUG NativeCodeLoader: java.library.path=....
<bunch of stuff>
Apr 11,2014 18:27:39.360 GMT T[AWT-EventQueue-0](26)  WARN NativeCodeLoader: Unable to load
native-hadoop library for your platform... using builtin-java classes where applicable
Apr 11,2014 18:27:39.375 GMT T[AWT-EventQueue-0](26) DEBUG JniBasedUnixGroupsMappingWithFallback:
Falling back to shell based
Apr 11,2014 18:27:39.375 GMT T[AWT-EventQueue-0](26) DEBUG JniBasedUnixGroupsMappingWithFallback:
Group mapping impl=org.apache.hadoop.security.ShellBasedUnixGroupsMapping
Apr 11,2014 18:27:39.375 GMT T[AWT-EventQueue-0](26) ERROR Shell: Failed to detect a valid
hadoop home directory: HADOOP_HOME or hadoop.home.dir are not set.
java.io.IOException: HADOOP_HOME or hadoop.home.dir are not set.
	at org.apache.hadoop.util.Shell.checkHadoopHome(Shell.java:265)
	at org.apache.hadoop.util.Shell.<clinit>(Shell.java:290)
	at org.apache.hadoop.util.StringUtils.<clinit>(StringUtils.java:76)
	at org.apache.hadoop.security.Groups.parseStaticMapping(Groups.java:92)
	at org.apache.hadoop.security.Groups.<init>(Groups.java:76)
	at org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Groups.java:239)
	at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:255)
	at org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:232)
	at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:718)
	at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:703)
	at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:605)
	at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:2473)
	at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:2465)
	at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2331)
	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:369)
	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:168)
	at org.apache.commons.vfs2.provider.hdfs.HdfsFileSystem.resolveFile(HdfsFileSystem.java:115)
	at org.apache.commons.vfs2.provider.AbstractOriginatingFileProvider.findFile(AbstractOriginatingFileProvider.java:84)
	at org.apache.commons.vfs2.provider.AbstractOriginatingFileProvider.findFile(AbstractOriginatingFileProvider.java:64)
	at org.apache.commons.vfs2.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:700)
	at org.apache.commons.vfs2.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:656)
	at org.apache.commons.vfs2.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:609)

Apr 11,2014 18:27:39.391 GMT T[AWT-EventQueue-0](26) ERROR Shell: Failed to locate the winutils
binary in the hadoop binary path: Could not locate executable null\bin\winutils.exe in the
Hadoop binaries.
java.io.IOException: Could not locate executable null\bin\winutils.exe in the Hadoop binaries.

Apr 11,2014 18:27:39.391 GMT T[AWT-EventQueue-0](26) DEBUG Groups: Group mapping impl=org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback;
cacheTimeout=300000; warningDeltaMs=5000
Apr 11,2014 18:27:39.469 GMT T[AWT-EventQueue-0](26) DEBUG UserGroupInformation: hadoop login
Apr 11,2014 18:27:39.469 GMT T[AWT-EventQueue-0](26) DEBUG UserGroupInformation: hadoop login
commit
Apr 11,2014 18:27:39.751 GMT T[AWT-EventQueue-0](26) DEBUG UserGroupInformation: using local
user:NTUserPrincipal: <user_name>
Apr 11,2014 18:27:39.751 GMT T[AWT-EventQueue-0](26) DEBUG UserGroupInformation: UGI loginUser:whiro01
(auth:SIMPLE)
Apr 11,2014 18:27:39.813 GMT T[AWT-EventQueue-0](26) ERROR HdfsFileSystem: Error connecting
to filesystem hdfs://hadoop-master:50070/: No FileSystem for scheme: hdfs
java.io.IOException: No FileSystem for scheme: hdfs
	at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2304)
	at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2311)
	at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:90)
	at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2350)
	at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2332)
	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:369)
	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:168)
	at org.apache.commons.vfs2.provider.hdfs.HdfsFileSystem.resolveFile(HdfsFileSystem.java:115)
	at org.apache.commons.vfs2.provider.AbstractOriginatingFileProvider.findFile(AbstractOriginatingFileProvider.java:84)
	at org.apache.commons.vfs2.provider.AbstractOriginatingFileProvider.findFile(AbstractOriginatingFileProvider.java:64)
	at org.apache.commons.vfs2.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:700)
	at org.apache.commons.vfs2.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:656)
	at org.apache.commons.vfs2.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:609)

So, my guess is that I don't have enough configuration setup on my client machine to tell
Hadoop that the authentication is to be done at the remote end ....??  So, I'm trying to track
down what the configuration info might be.

Hoping to see if anyone here can see past the Commons VFS stuff that you probably don't understand
to be able to tell me what other Hadoop/HDFS files / configuration I need to get this working.

Note: I want to build a GUI component that can browse to arbitrary HDFS installations, so
I can't really be setting up a hard-coded XML file for each potential Hadoop cluster I might
connect to ....

Thanks,
~Roger Whitcomb


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