Modify HDFS Configurations

You may need to modify your hdfs-site configuration and/or your core-site configuration.

	Note
	For Ambari 2.6.0 and higher, `config.sh` is not supported and will fail. Use `config.py` instead.

Prerequisites

Check whether you need to modify your hdfs-site configuration, by executing the following command on the Ambari Server host:

/var/lib/ambari-server/resources/scripts/configs.py -u <AMBARI_USER> -p <AMBARI_PW> -port <AMBARI_PORT> get localhost <CLUSTER_NAME> hdfs-site

If you see any of the following properties, you must delete them from your configuration.

dfs.nameservices
dfs.client.failover.proxy.provider.<NAMESERVICE_ID>
dfs.ha.namenodes.<NAMESERVICE_ID>
dfs.ha.fencing.methods
dfs.ha.automatic-failover.enabled
dfs.namenode.http-address.<NAMESERVICE_ID>.nn1
dfs.namenode.http-address.<NAMESERVICE_ID>.nn2
dfs.namenode.rpc-address.<NAMESERVICE_ID>.nn1
dfs.namenode.rpc-address.<NAMESERVICE_ID>.nn2
dfs.namenode.shared.edits.dir
dfs.journalnode.edits.dir
dfs.journalnode.http-address
dfs.journalnode.kerberos.internal.spnego.principal
dfs.journalnode.kerberos.principal
dfs.journalnode.keytab.file
Where <NAMESERVICE_ID> is the NameService ID you created when you ran the Enable NameNode HA wizard.

To modify your hdfs-site configuration:

Steps

On the Ambari Server host, execute the following for each property you found:
/var/lib/ambari-server/resources/scripts/configs.py -u <AMBARI_USER> -p <AMBARI_PW> -port <AMBARI_PORT> delete localhost <CLUSTER_NAME> hdfs-site property_name
Replace property_name with the name of each of the properties to be deleted.
Verify that all of the properties have been deleted:
/var/lib/ambari-server/resources/scripts/configs.py -u <AMBARI_USER> -p <AMBARI_PW> -port <AMBARI_PORT> get localhost <CLUSTER_NAME> hdfs-site
None of the properties listed above should be present.
Determine whether you must modify your core-site configuration:
/var/lib/ambari-server/resources/scripts/configs.py -u <AMBARI_USER> -p <AMBARI_PW> -port <AMBARI_PORT> get localhost <CLUSTER_NAME> core-site
If you see the property ha.zookeeper.quorum, delete it:
/var/lib/ambari-server/resources/scripts/configs.py -u <AMBARI_USER> -p <AMBARI_PW> -port <AMBARI_PORT> delete localhost <CLUSTER_NAME> core-site ha.zookeeper.quorum
If the property fs.defaultFS is set to the NameService ID, revert it to its non-HA value:
"fs.defaultFS":"hdfs://<name-service-id>" The property fs.defaultFS needs to be modified as it points to a NameService ID "fs.defaultFS":"hdfs://<nn01.mycompany.com>"
You need not change the property fs.defaultFS, because it points to a specific NameNode, not to a NameService ID.
Revert the property fs.defaultFS to the NameNode host value:
/var/lib/ambari-server/resources/scripts/configs.py -u <AMBARI_USER> -p <AMBARI_PW> -port <AMBARI_PORT> set localhost <CLUSTER_NAME> core-site fs.defaultFS hdfs://<NAMENODE_HOSTNAME>
Verify that the core-site properties are now properly set:
/var/lib/ambari-server/resources/scripts/configs.py -u <AMBARI_USER> -p <AMBARI_PW> -port <AMBARI_PORT> get localhost <CLUSTER_NAME> core-site
The property fs.defaultFS should be the NameNode host and the property ha.zookeeper.quorum should not appear.

​Modify HDFS Configurations

Modify HDFS Configurations