This is the documentation for CDH 5.0.x. Documentation for other versions is available at Cloudera Documentation.
Hadoop Users in CDH 5
A number of special users are created by default when installing and using CDH 5. Given below is a list of users as of the latest CDH 5 release. Also listed below are the corresponding Kerberos principals and keytab files that should be created when you configure Kerberos security on your cluster.
|
Project |
Unix User ID |
Primary Group |
Group Members |
Notes |
|---|---|---|---|---|
|
Apache Avro |
No special users. |
|||
|
Apache Flume |
flume | flume |
The sink that writes to HDFS as this user must have write privileges. |
|
|
Apache HBase |
hbase | hbase |
The Master and the RegionServer processes run as this user. |
|
|
HDFS |
hdfs | hdfs | impala |
The NameNode and DataNodes run as this user, and the HDFS root directory as well as the directories used for edit logs should be owned by it. |
|
Apache Hive |
hive | hive | impala |
The HiveServer2 process and the Hive Metastore processes run as this user. A user must be defined for Hive access to its Metastore DB (e.g. MySQL or Postgres) but it can be any identifier and does not correspond to a Unix uid. This is javax.jdo.option.ConnectionUserName in hive-site.xml. |
|
Apache HCatalog |
hive | hive |
The WebHCat service (for REST access to Hive functionality) runs as the hive user. It is not configurable. |
|
|
HttpFS |
httpfs | httpfs |
The HttpFS service runs as this user. *See HttpFS Security Configuration for instructions on how to generate the merged httpfs-http.keytab file. |
|
|
Hue |
hue | hue |
Hue runs as this user. It is not configurable. |
|
|
Cloudera Impala |
impala | impala |
An interactive query tool. |
|
|
Llama |
llama | llama |
|
|
|
Apache Mahout |
No special users. |
|||
|
MapReduce |
mapred | mapred |
Without Kerberos, the JobTracker and tasks run as this user. The LinuxTaskController binary is owned by this user for Kerberos. It would be complicated to use a different user ID. |
|
|
Apache Oozie |
oozie | oozie |
The Oozie service runs as this user. |
|
|
Parquet |
No special users. |
|||
|
Apache Pig |
No special users. |
|||
|
Cloudera Search |
solr | solr |
The Solr process runs as this user. It is not configurable. |
|
|
Apache Spark |
spark | spark |
The Spark process runs as this user. It is not configurable. |
|
|
Apache Sentry (incubating) |
No special users. |
|||
|
Apache Sqoop |
sqoop | sqoop |
This user is only for the Sqoop1 Metastore, a configuration option that is not recommended. |
|
|
Apache Sqoop2 |
sqoop2 | sqoop |
The Sqoop2 service runs as this user. |
|
|
Apache Whirr |
No special users. |
|||
|
YARN |
yarn | yarn |
Without Kerberos, all YARN services and applications run as this user. The LinuxContainerExecutor binary is owned by this user for Kerberos. It would be complicated to use a different user ID. |
|
|
Apache ZooKeeper |
zookeeper | zookeeper |
The ZooKeeper process runs as this user. It is not configurable. |
|
| Other | hadoop | yarn, hdfs, mapred |
This is a group with no associated Unix user ID or keytab. |
|
NoteThe Kerberos principal names should be of the format, username/fully.qualified.domain.name@YOUR-REALM.COM, where the term username refers to the username of an existing UNIX account, such as hdfs or mapred. The table below lists the usernames to be used for the Kerberos principal names. For example, the Kerberos principal for Apache Flume would be flume/fully.qualified.domain.name@YOUR-REALM.COM.
| Project (UNIX ID) | Service | Kerberos Principal Primary | Filename (.keytab) | Keytab File Owner | Keytab File Group | File Permission (octal) |
|---|---|---|---|---|---|---|
| Flume (flume) | flume-AGENT | flume | flume | flume | flume | 600 |
| HBase (hbase) | hbase-REGIONSERVER | hbase | hbase | hbase | hbase | 600 |
| hbase- HBASETHRIFTSERVER | ||||||
| hbase- HBASERESTSERVER | ||||||
| hbase-MASTER | ||||||
| HDFS (hdfs) | hdfs-NAMENODE | hdfs | hdfs Secondary: Merge hdfs and HTTP |
hdfs | hdfs | 600 |
| hdfs-DATANODE | ||||||
| hdfs- SECONDARYNAMENODE | ||||||
| Hive (hive) | hive-HIVESERVER2 | hive | hive | hive | hive | 600 |
| hive-WEBHCAT | HTTP | HTTP | ||||
| hive-HIVEMETASTORE | hive | hive | ||||
| HttpFS (httpfs) | hdfs-HTTPFS | httpfs | httpfs | httpfs | httpfs | 600 |
| Hue (hue) | hue-KT_RENEWER | hue | hue | hue | hue | 600 |
| Impala (impala) | impala-STATESTORE | impala | impala | impala | impala | 600 |
| impala-CATALOGSERVER | ||||||
| impala-IMPALAD | ||||||
| Llama (llama) | ||||||
| MapReduce (mapred) | mapreduce-JOBTRACKER | mapred | mapred Secondary: Merge mapred and HTTP |
mapred | hadoop | 600 |
| mapreduce- TASKTRACKER | ||||||
| Oozie (oozie) | oozie-OOZIE_SERVER | oozie | oozie Secondary: Merge oozie and HTTP |
oozie | oozie | 600 |
| Search (solr) | solr-SOLR_SERVER | solr | solr Secondary: Merge solr and HTTP |
solr | solr | 600 |
| Sentry (sentry) | ||||||
| Spark (spark) | ||||||
| Sqoop (sqoop) | ||||||
| Sqoop2 (sqoop2) | ||||||
| YARN (yarn) | yarn-NODEMANAGER | yarn | yarn Secondary: Merge yarn and HTTP |
yarn | hadoop | 644 |
| yarn- RESOURCEMANAGER | 600 | |||||
| yarn-JOBHISTORY | 600 | |||||
| ZooKeeper (zookeeper) | zookeeper-server | zookeeper | zookeeper | zookeeper | zookeeper | 600 |
| << Tips and Guidelines | Centralized Cache Management in HDFS >> | |