KDC Kerberized Yarn Services Fail to Start on Isilon OneFS 8.0.1 with Ambari via WebHDFS curl calls

An issue has been seen when a KDC kerberized Hortonworks cluster attempts to start Yarn services or any other services that leverage WebHDFS to start with OneFS 8.0.1. The incorrect generation of the the krb5.conf can leave the file without a READ permission for the services handling WebHDFS calls and authentication cannot occur leading to […]

Read more "KDC Kerberized Yarn Services Fail to Start on Isilon OneFS 8.0.1 with Ambari via WebHDFS curl calls"

Tweaks to HDFS services to make them play nice with Kerberized Isilon access

If you are kerberizing a hadoop cluster against an Isilon, you’ll need to look at adding the following to the hdfs services to enable Isilon compatibility. All Distro’s 1. Add custom property hadoop.security.token.service.use_ip=false to core-site.xml When you kerberize with AD, Isilon’s cluster SPN is used and not the SCZ SPN.  (this is our odd behavior) […]

Read more "Tweaks to HDFS services to make them play nice with Kerberized Isilon access"

Increase the kerberos logging level on a client to see what is actually going on

if you are seeing issues with kerberos based hdfs client access against an Isilon cluster, increasing the kerberos logging level on the client can show you a lot more information(a lot) Change the logging level with the following: export HADOOP_ROOT_LOGGER=”TRACE,console” export HADOOP_OPTS=”-Dsun.security.krb5.debug=true”     quick example of a successful kerberized hadoop call from a kerberized […]

Read more "Increase the kerberos logging level on a client to see what is actually going on"

Isilon and Kerberos

I’m starting to see an increase in the amount of Kerberized access to Isilon clusters, the following is an excellent start to understanding the process of Kerberizing an Isilon cluster for NFS access. In later posts I’ll discuss Kerberized Hadoop access to Isilon.   But, this doc is a great first step, it’s hosted on […]

Read more "Isilon and Kerberos"

Isilon HDFS and Rack Awareness for DataNode Connections

Wanted to clear up the implementation of racks with Isilon hdfs and providing rack awareness, using Isilon racks we can provide node location awareness to clients and within-switch datanode connections collocation. This gives you the capability to provide switch aware or top of rack functionality that emulates hdfs local storage implementations, where compute nodes attempt […]

Read more "Isilon HDFS and Rack Awareness for DataNode Connections"