[GitHub] jon-wei commented on a change in pull request #6863: Adding a tutorial in doc for using Kerberized Hadoop as deep storage.

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jon-wei commented on a change in pull request #6863: Adding a tutorial in doc for using Kerberized Hadoop as deep storage.
URL: https://github.com/apache/incubator-druid/pull/6863#discussion_r248863909
 
 

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 File path: docs/content/tutorials/tutorial-kerberos-hadoop.md
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+# Tutorial: Configuring Druid to use a Kerberized Hadoop as Deep Storage
+
+
+## Hadoop Setup
+
+Following are the configurations files required to be copied over to Druid conf folders:
+
+1. For HDFS as a deep storage, hdfs-site.xml, core-site.xml
+2. For ingestion, mapred-site.xml, yarn-site.xml
+
+
+### HDFS Folders and permissions
+
+1. Choose any folder name for the druid deep storage, for example 'druid'
+2. Create the folder in hdfs under the required parent folder. For example,
+`hdfs dfs -mkdir /druid`
+OR
+`hdfs dfs -mkdir /apps/druid`
+
+3. Give appropriate permissions for the druid processes to access this folder. This would ensure that druid is able to 
+create necessary folders like data and indexing_log in HDFS.
+For example, if druid processes run as user 'root', then
+
+    `hdfs dfs -chown root:root /apps/druid`
+
+    OR
+
+    `hdfs dfs -chmod 777 /apps/druid`
+
+Druid creates necessary sub-folders to store  data and index under this newly created folder.
+
+## Druid Setup
+
+Edit druid common_runtime_properties to include the HDFS properties. Folders used for the location are same as the ones 
+used for example above.
+
+### common_runtime_properties
+
+```#
+# Deep storage
+#
+# For HDFS:
+druid.storage.type=hdfs
+druid.storage.storageDirectory=/druid/segments
+# OR
+# druid.storage.storageDirectory=/apps/druid/segments
+
+
+#
+# Indexing service logs
+#
+
+
+# For HDFS:
+druid.indexer.logs.type=hdfs
+druid.indexer.logs.directory=/druid/indexing-logs
+# OR
+# druid.storage.storageDirectory=/apps/druid/indexing-logs
+```
+
+Note: Comment out Local storage and S3 Storage parameters in the file
+
+Also include hdfs-storage core extension to conf/druid/_common/common.runtime.properties
+
+```
+#
+# Extensions
+#
+
+druid.extensions.directory=dist/druid/extensions
+druid.extensions.hadoopDependenciesDir=dist/druid/hadoop-dependencies
+druid.extensions.loadList=["druid-parser-route", "mysql-metadata-storage", "druid-hdfs-storage", "druid-histogram", "druid-kerberos", "druid-kafka-indexing-service"]
+
+```
+
+### Hadoop Jars
+
+Ensure that Druid has necessary jars to support the Hadoop version.
+
+Find the hadoop version using command, `hadoop version` 
+
+In case there are other softwares used with hadoop, like WanDisco, ensure that 
+1. the necessary libraries are available
+2. add the requisite extensions to `druid.extensions.loadlist` in `conf/druid/_common/common.runtime.properties`
+
+### Kerberos setup
+
+Create a headless keytab which would have access to the druid data and index.
+
+Edit conf/druid/_common/common.runtime.properties and add the following properties:
+
+```
+druid.hadoop.security.kerberos.principal
+druid.hadoop.security.kerberos.keytab
+```
+
+For example
+
+```
+druid.hadoop.security.kerberos.principal=hdfs-vpimply@IMPLY.IO
+druid.hadoop.security.kerberos.keytab=/etc/security/keytabs/hdfs.headless.keytab
+```
+
+## SPNEGO Setup
+
+To ensure that you are able to read logs stored in the HDFS from a front end,
 
 Review comment:
   Hm, I think this section is only needed if Kerberos authentication is enabled on the Druid cluster itself, since the interactions with HDFS uses the principal/keytab configured with `druid.hadoop.security.kerberos.*` (not the credentials of the user requesting logs via the browser from the overlord console).
   
   It's possible to have a deployment where HDFS deep storage requires Kerberos but Druid itself does not, in which case the user doesn't need to setup Kerberos in their browser when accessing Druid's consoles.

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