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| layout | title |
|---|---|
| doc_page | HDFS |
HDFS
To use this Apache Druid (incubating) extension, make sure to include druid-hdfs-storage as an extension.
Deep Storage
Configuration
| Property | Possible Values | Description | Default |
|---|---|---|---|
druid.storage.type |
hdfs | Must be set. | |
druid.storage.storageDirectory |
Directory for storing segments. | Must be set. | |
druid.hadoop.security.kerberos.principal |
druid@EXAMPLE.COM |
Principal user name | empty |
druid.hadoop.security.kerberos.keytab |
/etc/security/keytabs/druid.headlessUser.keytab |
Path to keytab file | empty |
If you are using the Hadoop indexer, set your output directory to be a location on Hadoop and it will work.
If you want to eagerly authenticate against a secured hadoop/hdfs cluster you must set druid.hadoop.security.kerberos.principal and druid.hadoop.security.kerberos.keytab, this is an alternative to the cron job method that runs kinit command periodically.
Google Cloud Storage
The HDFS extension can also be used for GCS as deep storage.
Configuration
| Property | Possible Values | Description | Default |
|---|---|---|---|
druid.storage.type |
hdfs | Must be set. | |
druid.storage.storageDirectory |
gs://bucket/example/directory | Must be set. |
All services that need to access GCS need to have the GCS connector jar in their class path. One option is to place this jar in /lib/ and /extensions/druid-hdfs-storage/
Tested with Druid 0.9.0, Hadoop 2.7.2 and gcs-connector jar 1.4.4-hadoop2.