@mqureshi Thanks for the quick response, I have already made all the changes which are in that link. Even I have made changes which I mentioned in the example. Now I need more OS level setting which improves cluster performance. ... View more

@revan wabale I think you have logged in as admin and trying to do operations, Refer Link and create hdfs directory for admin and give appropriately permissions . It will works Connect to a host in the cluster that includes the HDFS client. Switch to the hdfs system account user. su - hdfs Using the HDFS client, make an HDFS directory for the user. For example, if your username is admin, you would create the following directory. hadoop fs -mkdir /user/admin Set the ownership on the newly created directory. For example, if your username is admin, you would make that user the directory owner. hadoop fs -chown admin:hadoop /user/admin ... View more

@sankar rao check for Hadoop Log Dir Prefix property location In Ambari-->HDFS-->>Advance Hadoop env. Location pointing to that property, there you can find log files. You need to check on datanode server. Link ... View more

@sankar rao Please log to server where datanodes are down cd /var/log/hadoop/hdfs ll -ltr there you can find the file like this hadoop-hdfs-datanode-(hostname).log tail -300f hadoop-hdfs-datanode-(hostname).log and paste the output here for analysing the issue. ... View more

@Shiv kumar As you are using some advanced database configuration. Can you please check is database schema installed properly http://docs.hortonworks.com/HDPDocuments/Ambari-2.1.2.0/bk_ambari_reference_guide/content/_using_non-default_databases_-_ambari.html ... View more

@JJ Yang maria_dev has only read_only access for Ambari. Either log in as admin/admin or follow the link and 2.2 SETUP AMBARI ADMIN PASSWORD MANUALLY ... View more