Last updated on DECEMBER 04, 2015
Applies to:Big Data Appliance Integrated Software - Version 4.2.0 and later
Disabling Kerberos (MIT Kerberos or AD Kerberos) on BDA V4.2 (CDH 5.4) may require clearing the /hbase znodes. Without this the HBase service may fail to come up after/during Kerberos removal while running 'bdacli disable kerberos' or 'bdacli disable ad_kerberos'. Note however it may not be possible to clear /hbase znodes if HBase replication is enabled. For MIT Kerberos removal see: Instructions to Disable Kerberos on Oracle Big Data Appliance with Mammoth V3.*/V4.* Releases (Doc ID 1919431.1); for AD Kerberos removal see: Instructions to Enable/Disable AD Kerberos on Oracle Big Data Appliance with Mammoth V4.2 Release (Doc ID 2029378.1).
For earlier BDA versions, see: How to Remove /hbase/acl Znode Left Around After Kerberos is Disabled (Doc ID 1923834.1). Some of the same steps apply, but some differ in BDA V4.2 (CDH 5.4).
Using 'bdacli disable ad_kerberos' as an example, symptoms look like:
1. The command to remove Kerberos, for example, 'bdacli disable ad_kerberos' fails as below:
INFO: Also check the log file in /opt/oracle/BDAMammoth/bdaconfig/tmp/pagent-bdanode01-20150826221731.log
ERROR: Kerberos removal ran into issues. Exiting.
INFO: Running bdadiagcluster...
2. In Cloudera Manager (CM) the HBase service is down and can not be restarted.
3. Since 'bdacli disable ad_kerberos' did not complete, 'bdacli kerberos status' shows true.
4. However enough of 'bdacli disable ad_kerberos' completes such that CM shows that is Kerberos is removed.
a) From CM: Administration > Kerberos, Kerberos is disabled.
Output is like:
<cluster_name> Kerberos is disabled. [Enable Kerberos]
b) From CM: HBase security is disabled. Navigating: HBase > Configuration > Search: auth
HBase Secure Authentication > simple
HBase Secure Authorization > HBase is unchecked
HBase Thrift Authentication > none
HBase REST Authentication > simple
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