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
