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id | title | sidebar_label |
---|---|---|
tutorial-kerberos-hadoop | Configure Apache Druid to use Kerberized Apache Hadoop as deep storage | Kerberized HDFS deep storage |
Hadoop Setup
Following are the configurations files required to be copied over to Druid conf folders:
- For HDFS as a deep storage, hdfs-site.xml, core-site.xml
- For ingestion, mapred-site.xml, yarn-site.xml
HDFS Folders and permissions
-
Choose any folder name for the druid deep storage, for example 'druid'
-
Create the folder in hdfs under the required parent folder. For example,
hdfs dfs -mkdir /druid
ORhdfs dfs -mkdir /apps/druid
-
Give druid processes 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 common.runtime.properties at conf/druid/_common/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=["mysql-metadata-storage", "druid-hdfs-storage", "druid-kerberos"]
Hadoop Jars
Ensure that Druid has necessary jars to support the Hadoop version.
Find the hadoop version using command, hadoop version
In case there is other software used with hadoop, like WanDisco
, ensure that
- the necessary libraries are available
- add the requisite extensions to
druid.extensions.loadlist
inconf/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-test@EXAMPLE.IO
druid.hadoop.security.kerberos.keytab=/etc/security/keytabs/hdfs.headless.keytab
Restart Druid Services
With the above changes, restart Druid. This would ensure that Druid works with Kerberized Hadoop