6. Resolving General Problems
6.1. During Enable Kerberos, the Check Kerberos operation fails.
When enabling Kerberos using the wizard, the Check Kerberos operation fails. In /var/log/ambari-server/ambari-server.log, you see a message: 02:45:44,490 WARN [qtp567239306-238] MITKerberosOperationHandler:384 - Failed to execute kadmin:
Check that NTP is running and confirm your hosts and the KDC times are in sync. A time
skew as little as 5 minutes can cause Kerberos authentication to fail.
6.1.2. Solution 2: (on RHEL/CentOS/Oracle Linux)
Check that the Kerberos Admin principal being used has the necessary KDC ACL rights as
set in /var/kerberos/krb5kdc/kadm5.acl .
6.2. Problem: Hive developers may encounter an exception error message during Hive Service Check
MySQL is the default database used by the Hive metastore. Depending on several factors, such as the version and configuration of MySQL, a Hive developer may see an exception message similar to the following one:
An exception was thrown while adding/validating classes) : Specified key was too long; max key length is 767 bytes
Administrators can resolve this issue by altering the Hive metastore database to use
the Latin1 character set, as shown in the following example: mysql> ALTER
DATABASE <metastore.database.name> character set
latin1;
6.3. Problem: API calls for PUT, POST, DELETE respond with a "400 - Bad Request"
When attempting to perform a REST API call, you receive a 400 error response. REST API calls require the "X-Requested-By" header.
Starting with Ambari 1.4.2, you must include the "X-Requested-By" header
with the REST API calls.
For example, if using curl, include the -H "X-Requested-By:
ambari" option. curl -u admin:admin -H "X-Requested-By:
ambari" -X DELETE
http://<ambari-host>:8080/api/v1/hosts/host1
6.4. Problem: Ambari is checking disk full on non-local disks; causing a high number of auto-mounted home directories
When Ambari issues it's check to detect local disk capacity and use for each Ambari
Agent, it uses df by default instead of df -l to only
check local disks. If using NFS auto-mounted home directories, this can lead to a high
number of home directories being mounted on each host; causing shutdown delays and disk
capacity check delays.
On the Ambari Server, edit the /etc/ambari-server/conf/ambari.properties and add the following property to only check locally mounted devices.
agent.check.remote.mounts=false
6.5. Problem: Links in pdf documentation not working.
Links in 2.1.1. pdf documentation not working.
Use working links from 2.1.1 html documentation.
