Forum Discussion

Copper Contributor

Sep 27, 2018

Solved

How can I use NiFi to ingest data from/to ADLS?

I would like to use NiFi to connect with ADLS. My scenario is like this: Nifi is installed and running in windows machine.Now i want to move data from my windows local directory to ADLS. I am not usi...

Mar 09, 2019

No Hadoop is needed .. For ADLS Gen1 and Gen1 you need a couple of JAR files and a simplified core-site.xml. I am currently working with Nifi 1.9.0 (released feb 2019).

For ADLS Gen1 I am using :

azure-data-lake-store-sdk-2.3.1.jar
hadoop-azure-datalake-3.1.1.jar
These jars are available in the Maven central repository
My core-site.xml : (replace the $< >$ with your values.

<configuration>
<property>
<name>fs.defaultFS</name>
<value>adl://$<adls storage account name>$.azuredatalakestore.net</value>
</property>
<property>
<name>dfs.adls.oauth2.access.token.provider.type</name>
<value>ClientCredential</value>
</property>
<property>
<name>dfs.adls.oauth2.refresh.url</name>
<value>https://login.microsoftonline.com/$<tenant id>$/oauth2/token</value>
</property>
<property>
<name>dfs.adls.oauth2.client.id</name>
<value>$<client id>$</value>
</property>
<property>
<name>dfs.adls.oauth2.credential</name>
<value>$<key>$</value>
</property>
</configuration>

For ADLS Gen2 I am using :

hadoop-azure-3.2.0.jar
wildfly-openssl-1.0.4.Final.jar
my core-site.xml (replace the $< >$ with your values.

<configuration>
  <property>
    <name>fs.defaultFS</name>
    <value>abfss://$<cotainer>$@$<account>$.dfs.core.windows.net</value>
  </property>
  <property>
    <name>fs.azure.account.key.adbstorgen2.dfs.core.windows.net</name>
    <value>$<storage key>$</value>
  </property>
  <property>
             <name>fs.adlsGen2.impl</name>
             <value>org.apache.hadoop.fs.azurebfs.AzureBlobFileSystem</value>
   </property>
   <property>
             <name>fs.abfss.impl</name>
             <value>org.apache.hadoop.fs.azurebfs.SecureAzureBlobFileSystem</value>
   </property>
   <property>
             <name>fs.AbstractFileSystem.adlsGen2.impl</name>
             <value>org.apache.hadoop.fs.azurebfs.Abfs</value>
   </property>
   <property>
             <name>fs.AbstractFileSystem.abfss.impl</name>
             <value>org.apache.hadoop.fs.azurebfs.Abfss</value>
   </property>
   <property>
             <name>fs.azure.check.block.md5</name>
             <value>false</value>
   </property>
   <property>
             <name>fs.azure.store.blob.md5</name>
             <value>false</value>
   </property>
   <property>
             <name>fs.azure.createRemoteFileSystemDuringInitialization</name>
             <value>true</value>
   </property>
</configuration>

for the put list fetch HDFS flows .. you just need to fill in the Hadoop Configuration Resources with the path to your core-site.xml and Additional Classpath Resources with the folder that has the azure jar files. Enjoy !

stawo

Copper Contributor

Mar 19, 2019

Hi Bruce Nelson ,

thanks for the tips.

I tried to reproduce the steps you mentioned, but NiFi doesn't load properly the PutHDFS flow (it's the only one I'm testing at the moment).
The error I get is:

o.apache.nifi.processors.hadoop.PutHDFS PutHDFS[id=...] HDFS Configuration error - Configuration property [account name].dfs.core.windows.net not found.: Configuration property [account name].dfs.core.windows.net not found.
org.apache.hadoop.fs.azurebfs.contracts.exceptions.ConfigurationPropertyNotFoundException: Configuration property [account name].dfs.core.windows.net not found.
at org.apache.hadoop.fs.azurebfs.AbfsConfiguration.getStorageAccountKey(AbfsConfiguration.java:342)
at org.apache.hadoop.fs.azurebfs.AzureBlobFileSystemStore.initializeClient(AzureBlobFileSystemStore.java:812)
at org.apache.hadoop.fs.azurebfs.AzureBlobFileSystemStore.<init>(AzureBlobFileSystemStore.java:149)
at org.apache.hadoop.fs.azurebfs.AzureBlobFileSystem.initialize(AzureBlobFileSystem.java:108)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:3288)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:473)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:225)
at org.apache.nifi.processors.hadoop.AbstractHadoopProcessor$1.run(AbstractHadoopProcessor.java:434)
at org.apache.nifi.processors.hadoop.AbstractHadoopProcessor$1.run(AbstractHadoopProcessor.java:431)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/javax.security.auth.Subject.doAs(Subject.java:423)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1962)
at org.apache.nifi.processors.hadoop.AbstractHadoopProcessor.getFileSystemAsUser(AbstractHadoopProcessor.java:431)
at org.apache.nifi.processors.hadoop.AbstractHadoopProcessor.resetHDFSResources(AbstractHadoopProcessor.java:393)
at org.apache.nifi.processors.hadoop.AbstractHadoopProcessor.abstractOnScheduled(AbstractHadoopProcessor.java:251)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotations(ReflectionUtils.java:142)
at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotations(ReflectionUtils.java:130)
at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotations(ReflectionUtils.java:75)
at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotation(ReflectionUtils.java:52)
at org.apache.nifi.controller.StandardProcessorNode.lambda$initiateStart$4(StandardProcessorNode.java:1515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:844)

I tried to check around, but I have no idea what it can refer to.

I'm currently using Nifi 1.9.1, and the jars with the version you specified on Ubuntu 18.04 Server.

Could you help me?

Thanks in advance,

Michele

stawo

Copper Contributor

Mar 25, 2019

Ok, I figured out where the problem was by reading http://docs.wandisco.com/bigdata/wdfusion/adls/.
In Bruce answer there is a small mistake in the ADLS Gen2 core-site.xml.
The correct one should be (differences marked in bold):

<configuration>
  <property>
    <name>fs.defaultFS</name>
    <value>abfss://$<container>$@$<account>$.dfs.core.windows.net</value>
  </property>
  <property>
    <name>fs.azure.account.key.$<account>$.dfs.core.windows.net</name>
    <value>$<storage key>$</value>
  </property>
  <property>
             <name>fs.adlsGen2.impl</name>
             <value>org.apache.hadoop.fs.azurebfs.AzureBlobFileSystem</value>
   </property>
   <property>
             <name>fs.abfss.impl</name>
             <value>org.apache.hadoop.fs.azurebfs.SecureAzureBlobFileSystem</value>
   </property>
   <property>
             <name>fs.AbstractFileSystem.adlsGen2.impl</name>
             <value>org.apache.hadoop.fs.azurebfs.Abfs</value>
   </property>
   <property>
             <name>fs.AbstractFileSystem.abfss.impl</name>
             <value>org.apache.hadoop.fs.azurebfs.Abfss</value>
   </property>
   <property>
             <name>fs.azure.check.block.md5</name>
             <value>false</value>
   </property>
   <property>
             <name>fs.azure.store.blob.md5</name>
             <value>false</value>
   </property>
   <property>
             <name>fs.azure.createRemoteFileSystemDuringInitialization</name>
             <value>true</value>
   </property>
</configuration>

Tested using:

hadoop-azure-3.2.0.jar
wildfly-openssl-1.0.4.Final.jar