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I would like to create file transformation pipelines by downloading input files from remote HDFS and storing outputs files on the same remote HDFS. Kerberos is used to authenticate to my hadoop cluster.

On my local machine, I did the following steps:

  • installed kerberos and obtained a key,
  • set the environment variables (JAVA_HOME, HADOOP_CONF_DIR and HADOOP_OPTS).
  • install hadoop client, test read/write on remote HDFS with CLI command: hdfs dfs -ls hdfs://clusterhadoop/user => success
  • add environment variables in hop/config/hop-config.json
  • add hadoop plugins hadoop-common-3.1.1.jar and hadoop-hdfs-3.1.1.jar to the hdfs/lib directory created in hop/plugins/tech/
  • add hdfs in plugin explorer, with Main Class [.apache.hadoop.fs.hdfs.HdfsFileSystem] and path to jar librairies above.

After all that, I still can't see the contents of my HDFS from the CSV File Input or TextFIle Input. I get this error:

Error browsing to location: 'hdfs://clusterhadoop/user/toto.csv'
FileNotFolderException: Could not list the contents of "file:///home/ubuntu/hop/hdfs:/clusterhadoop/user" because it is not a folder.
Root cause: FileNotFolderException: Could not list the contents of "file:///home/ubuntu/hop/hdfs:/clusterhadoop/user" because it is not a folder.

.apachemons.vfs2.FileNotFolderException: Could not list the contents of "file:///home/ubuntu/hop/hdfs:/clusterhadoop/user" because it is not a folder.
    at .apachemons.vfs2.provider.AbstractFileObject.getChildren(AbstractFileObject.java:1107)
    at .apache.hop.ui.core.vfs.HopVfsFileDialog.populateFolder(HopVfsFileDialog.java:941)
    at .apache.hop.ui.core.vfs.HopVfsFileDialog.refreshBrowser(HopVfsFileDialog.java:898)
    at .apache.hop.ui.core.vfs.HopVfsFileDialog.refreshAll(HopVfsFileDialog.java:1278)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:569)
    at .apache.hop.ui.core.gui.BaseGuiWidgets.lambda$getListener$1(BaseGuiWidgets.java:213)
    at .eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:91)
    at .eclipse.swt.widgets.Display.sendEvent(Display.java:5857)
    at .eclipse.swt.widgets.Widget.sendEvent(Widget.java:1617)
    at .eclipse.swt.widgets.Display.runDeferredEvents(Display.java:5067)
    at .eclipse.swt.widgets.Display.readAndDispatch(Display.java:4519)
    at .apache.hop.ui.core.vfs.HopVfsFileDialog.open(HopVfsFileDialog.java:584)
    at .apache.hop.ui.core.dialog.BaseDialog.presentFileDialog(BaseDialog.java:278)
    at .apache.hop.ui.core.dialog.BaseDialog.presentFileDialog(BaseDialog.java:172)
    at .apache.hop.pipeline.transforms.fileinput.text.TextFileInputDialog.lambda$open$8(TextFileInputDialog.java:484)
    at .eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:91)
    at .eclipse.swt.widgets.Display.sendEvent(Display.java:5857)
    at .eclipse.swt.widgets.Widget.sendEvent(Widget.java:1617)
    at .eclipse.swt.widgets.Display.runDeferredEvents(Display.java:5067)
    at .eclipse.swt.widgets.Display.readAndDispatch(Display.java:4519)
    at .apache.hop.ui.core.dialog.BaseDialog.defaultShellHandling(BaseDialog.java:528)
    at .apache.hop.pipeline.transforms.fileinput.text.TextFileInputDialog.open(TextFileInputDialog.java:501)
    at .apache.hop.ui.hopgui.file.pipeline.delegates.HopGuiPipelineTransformDelegate.editTransform(HopGuiPipelineTransformDelegate.java:195)
    at .apache.hop.ui.hopgui.file.pipeline.HopGuiPipelineGraph.editTransform(HopGuiPipelineGraph.java:3368)
    at .apache.hop.ui.hopgui.file.pipeline.HopGuiPipelineGraph.editTransform(HopGuiPipelineGraph.java:2210)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:569)
    at .apache.hop.core.gui.plugin.action.GuiActionLambdaBuilder.lambda$createLambda$0(GuiActionLambdaBuilder.java:97)
    at .apache.hop.ui.hopgui.context.GuiContextUtil.lambda$handleActionSelection$0(GuiContextUtil.java:182)
    at .eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40)
    at .eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
    at .eclipse.swt.widgets.Display.runAsyncMessages(Display.java:5042)
    at .eclipse.swt.widgets.Display.readAndDispatch(Display.java:4522)
    at .apache.hop.ui.hopgui.HopGui.open(HopGui.java:478)
    at .apache.hop.ui.hopgui.HopGui.main(HopGui.java:356)

Can anyone help me? Thanks in advance for your time.

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