About sparsh_singhal

sparsh_singhal · ‎07-25-2018

We must perform Namenode HA before hdfs federation. What are the advantages and conceptual reasons for this?

sparsh_singhal · ‎07-23-2018

Files View could not open after HDFS Federation. Is setting up separate views for each nameservices respectively the only solution? Also, after creating the directory, do we have to mount it always?

sparsh_singhal · ‎07-17-2018

@Michael Bronson Document has recommended partition size for / and /var. /var mostly has your logs which can usually take up a lot of space. AFAIK swap should be disabled and swappiness should be 0.

sparsh_singhal · ‎07-10-2018

Hi @Michael Bronson You can calculate the requirements based upon the amount and type of data using the following guide: https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.6.3/bk_cluster-planning/bk_cluster-planning.pdf

sparsh_singhal · ‎07-10-2018

@Lian Jiang I did authenticate Knox using PAM. I created an ACL to give read access only to knox user on /etc/shadow file. Alternatively, you can try creating a link to the /etc/shadow file and give read access on that link. Links that I referred to: https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.6.5/bk_security/content/setting_up_pam_authentication.html https://www.ibm.com/support/knowledgecenter/en/SSPT3X_4.2.5/com.ibm.swg.im.infosphere.biginsights.admin.doc/doc/admin_knox_ldap_pam.html

sparsh_singhal · ‎06-04-2018

@Vinay K In a one-way trust between a trusted domain (AD Domain) and a trusting domain (MIT KDC), users or computers in the trusted domain can access resources in the trusting domain. However, users in the trusting domain cannot access resources in the trusted domain. So basically you tell your MIT KDC to trust the users in the AD to access resources in your cluster. Service access happens the same way as for MIT KDC users. Service will ask Kerberos to authenticate, if that user is authenticated to use that service, Kerberos will check the domain of the user and accordingly if that user is from a trusted domain, Kerberos will ask the AD/LDAP to authenticate and if AD authenticates, Kerberos trusts that user and so does your service.

sparsh_singhal · ‎06-02-2018

Well, the configuration files were correct, but the environment was not set properly. Checked hbase env on both nodes and found a difference. Update with the following properties in ambari and it worked: export LD_LIBRARY_PATH=::/usr/hdp/2.6.3.0-235/hadoop/lib/native/Linux-amd64-64:/usr/lib/hadoop/lib/native/Linux-amd64-64:/usr/hdp/current/hadoop-client/lib/native/Linux-amd64-64:/usr/hdp/2.6.3.0-235/hadoop/lib/native export HADOOP_HOME=/usr/hdp/2.6.3.0-235/hadoop export HADOOP_CONF_DIR=/usr/hdp/2.6.3.0-235/hadoop/etc/hadoop

sparsh_singhal · ‎06-01-2018

@schhabra I checked hbase-site.xml, hdfs-site.xml and core-site.xml. They are exactly same on both nodes.

sparsh_singhal · ‎05-31-2018

@Krishna Pandey Thanks. It worked. Need to give read permission on /etc/shadow to user Knox. Better if we create ACLs for it.

sparsh_singhal · ‎05-31-2018

@Krishna Pandey Yes, the permissions to the topology file were not correct. But now I'm getting this error HTTP/1.1 401 Unauthorized Date: Thu, 31 May 2018 13:07:02 GMT Set-Cookie: rememberMe=deleteMe; Path=/gateway/pamtest; Max-Age=0; Expires=Wed, 30-May-2018 13:07:04 GMT WWW-Authenticate: BASIC realm="application" Content-Length: 0 Server: Jetty(9.2.15.v20160210) The cluster is kerberized as well.

sparsh_singhal · ‎05-31-2018

@Krishna Pandey Linux distro is Centos 7. I tried with PAM Authentication. I am getting HTTP 404 error.

sparsh_singhal · ‎05-30-2018

We have start demo LDAP to access services using Knox gateway. But I want to access those services using my Unix/Posix users, which are already created.

sparsh_singhal · ‎05-28-2018

After Namenode HA, 2 out of my 3 Region Servers in HBase are not coming up. I looked at the logs and found that it is throwing unknown host exception for name service. 2018-05-24 08:48:29,551 INFO [regionserver/atlhashdn02.hashmap.net/192.166.4.37:16020] regionserver.HRegionServer: STOPPED: Failed initialization 2018-05-24 08:48:29,552 ERROR [regionserver/atlhashdn02.hashmap.net/192.166.4.37:16020] regionserver.HRegionServer: Failed init java.lang.IllegalArgumentException: java.net.UnknownHostException: clusterha at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:411) at org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:311) at org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:176) at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:688) at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:629) at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:159) at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2761) at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:99) at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2795) at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2777) at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:386) at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:179) at org.apache.hadoop.hbase.wal.DefaultWALProvider.init(DefaultWALProvider.java:97) at org.apache.hadoop.hbase.wal.WALFactory.getProvider(WALFactory.java:148) at org.apache.hadoop.hbase.wal.WALFactory.<init>(WALFactory.java:180) at org.apache.hadoop.hbase.regionserver.HRegionServer.setupWALAndReplication(HRegionServer.java:1648) at org.apache.hadoop.hbase.regionserver.HRegionServer.handleReportForDutyResponse(HRegionServer.java:1381) at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:917) at java.lang.Thread.run(Thread.java:745)

sparsh_singhal · ‎05-25-2018

If you're planning to implement security features provided, like Kerberos, Ranger and Knox, then I'd recommend you to go with HDP 2.5 because in HDP 2.6, there are a number of changes that still need to be documented and you'd spend most of your time on unnecessary troubleshooting.

sparsh_singhal · ‎05-21-2018

@heta desai Also, since ambari users are not synced very regularly, you can also set up a periodic cron job that syncs all user again.

sparsh_singhal · ‎05-21-2018

@heta desai Well, you may have to do that manually. For a scripting alternative, please have a look at this link.

sparsh_singhal · ‎05-20-2018

Hi @heta desai. On the node where ranger usersync is installed, please check connectivity to ldap using following commands: //For LDAP ldapsearch -W -H ldap://<FQDN of LDAP/AD> -D binduser@example.net -b "dc=example,dc=net" //For LDAPS ldapsearch -W -H ldaps://<FQDN of LDAP/AD> -D binduser@example.net -b "dc=example,dc=net" If you're successfully able to connect, then just restart the Ranger Usersync and users will be synced.

sparsh_singhal · ‎05-20-2018

Hi @heta desai . When you sync LDAP users in Ambari, it (Ambari) saves the data into its database. So, when you delete LDAP users it doesn't reflect on the UI as they are not deleted from Ambari's database.

sparsh_singhal · ‎05-18-2018

@Mike Wong I'd recommend disabling selinux and rebooting the machines. After that look into hdfs logs make sure hdfs is up with no alerts. Try restarting hdfs. All other services would come up then.

sparsh_singhal · ‎05-18-2018

@Mike Wong Please check your /etc/hosts on all nodes. And also if selinux is disabled using getenforce command.

sparsh_singhal · ‎05-16-2018

Well, the issue has been solved. It seems like a bug in HDP 2.6. After setting up one-way trust, you need to remove [domain_realm] and [capaths] from your krb5.conf. Also, check for spnego keytabs that they are properly created with entries for all encryption types and are present on every node.

sparsh_singhal · ‎05-14-2018

@mqureshi What if I set up 4 zookeeper node? The quorum would be ceil (4/2) = 2, but shouldn't it be 3 (n+1)/2.

sparsh_singhal · ‎04-24-2018

@William Gonzalez Is there any plan from Hortonworks to repeat this offer anytime soon?

sparsh_singhal · ‎04-23-2018

@Rajkumar Singh I did the same thing but I'm getting either HTTP Error 401 or 404 or certificate error. The cluster I'm testing this on is also Kerberized.

sparsh_singhal · ‎04-18-2018

I have got a cluster with Ranger, Ranger KMS, KNOX, and Kerberos (MIT KDC). I've also got HA for Namenode, RM, HiveServer2, Oozie, HBase and Ranger. I've also set up a one-way trust to AD using https://community.hortonworks.com/articles/59635/one-way-trust-mit-kdc-to-active-directory.html After setting up the trust, I am able to get tickets for AD users, but my services on cluster start showing error (Mostly UI not accessible). When I run service check, I get the following error: <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/> <title>Error 401 Authentication required</title> </head> <body><h2>HTTP ERROR 401</h2> <p>Problem accessing /webhdfs/v1/user/ambari-qa. Reason: <pre> Authentication required</pre></p><hr /><i><small>Powered by Jetty://</small></i><br/> <br/> <br/> While Rest of the services are fine; Yarn, Hive, Oozie, Ambari Infra and Spark 2 throws the above error on service check.

sparsh_singhal · ‎04-06-2018

I am installing Apache Griffin on my HDP cluster. I followed steps on this link . Apache Griffin requires spark URI link to submit the spark jobs. # spark-admin # spark.uri=http://10.149.247.156:28088 # spark.uri=http://10.9.246.187:8088 What link should I set?

sparsh_singhal · ‎03-15-2018

Unexpected driver error occurred while connecting to database Can't get Kerberos realm Cannot locate default realm Cannot locate default realm This is the error I got, and I added only hive jdbc standalone jar.

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Date Registered	‎03-15-2018 01:40 PM
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Re: Services Failing After One-Way Trust With AD

Why do we need Namenode HA for HDFS Federation?

Configure Files View after HDFS Federation

Re: ambari cluster + HW minimal requirements for p...

Re: ambari cluster + HW minimal requirements for p...

Re: Setup knox authentication

Re: kerberos MIT kdc with active directory one way...

Re: HBase Region Servers Startup Failed after Name...

Re: HBase Region Servers Startup Failed after Name...

Re: How to Set Up Knox Gateway for Unix Users?

Re: How to Set Up Knox Gateway for Unix Users?

Re: How to Set Up Knox Gateway for Unix Users?

How to Set Up Knox Gateway for Unix Users?

HBase Region Servers Startup Failed after Namenode...

Re: What is latest stable version of HDP which can...

Re: why deleted ldap users/groups shows in Ambari ...

Re: why deleted ldap users/groups shows in Ambari ...

Re: Ranger incremental sync with ldap is not worki...

Re: why deleted ldap users/groups shows in Ambari ...

Re: Connection failed: [Errno 111] Connection refu...

Re: Connection failed: [Errno 111] Connection refu...

Re: Services Failing After One-Way Trust With AD

Re: Number of Zookeepers in a 3 rack cluster with ...

Re: Free HWX Exam

Re: Setup knox over highly available HiveServer2 i...

Services Failing After One-Way Trust With AD

Spark uri for Apache Griffin

Re: Connecting to HiveServer2 Interactive / LLAP u...