@Michael Bronson The disk is already unusable go-ahead run fsck with a -y option to repair it 🙂 see above Either way you will have to replace that dirty disk anyways! ... View more

@Michael Bronson The Avahi daemon is present by default and allows you to discover network resources. No hortonworks documentation talks about it just because I think it trivial. Do you NEED it? No, AFAIK nobody absolutely needs this, it's a recent technology and the networks have worked before this. It can be convenient though on networks available to the public, but if you administer your network you know where services are. The only services that affect HDP are documented below especially the last 4 Set Up Password-less SSH Set Up Service User Accounts Enable NTP on the Cluster and on the Browser Host Check DNS and NSCD Configuring iptables Disable SELinux and PackageKit and check the umask Value DNS should work without Avahi, disable on a couple of nodes you will see the seervice still running fine ... View more

@Rohit Sharma Please find below answer to your question though I didn't understand exactly what you meant!!! 1. What are kerberize zone advantages. ? You can't Kerberize a zone but a cluster, but you can create an encryption zone those are 2 different things. The primary design goal of Kerberos is to eliminate the transmission of unencrypted passwords across the network. If used properly, Kerberos effectively eliminates the threat that packet sniffers would otherwise pose on a network. 2. Which services should i considered to keep in that zone? Again some confusing here. An encryption zone is a special directory whose contents will be transparently encrypted upon write and transparently decrypted upon read.You can store for example HR salary scheme, or just about any document you deem needs protection You either Kerberize the whole cluster or not, 3. Which approach is good to use other the this.? You need Kerberos if you're serious about security. AD/LDAP will cover only a fraction of components, many other systems will require Kerberos for identity. One can still keep users in the LDAP, but the first line in the infrastructure will be Kerberos. Kerberos is the defacto standard for securing your hadoop environment couple with SSL/SASL and the traditional firewalls and physical protection (Caged nodes in a datacenter) 4. If it's HA and Prod environment what are best practices.? HA and prod I don't see the link. HA is basically having a redundant system which is fault tolerant. And Prod environment is self-explanatory 5. How to implement and configure if I am planning to add ranger poorly? For authentication, there is no alternative for Kerberos. Once your cluster is Kerberized, you can make it easier for certain access path by using AD/LDAP. Example, access to HS2 via AD/LDAP authentication or accessing various services using Knox Authorization can be done via Ranger or using the natively supported ACL. Except for Storm and Kafka, having Kerberos is not mandatory. Without reliable authentication, authorization and auditing is meaningless. Common use case as yours: User A logs into the system with his AD credentials, HDFS or Hive ACL's kicks in for authorization. 6. If it is integrated with HDP and HDF cluster what would be administraror good practice? Now HDP & HDF are both managed by Ambari so that sort of simplifies so admin task for more info 7. Study materials if any in HDP? Better start off with HDP or HDF sandboxes see HDP HDF ... View more

@Victor Hely Your Atlas is in maintenance mode !! Can you go to the Ambari UI see attached screenshot Turn Off Maintenance mode and restart Atlas ensure Hbase is running all should work. If all works remember to accept the answer so others can also use it to resolve similar issue ... View more