I was trying to configure Ranger, however installation failed with message 'java.sql.sqlexception: Access denied for user 'root'@'hiveserver' using password:YES. ranger-error.png Note: Am able to login to mysql 'mysql -u root -p' with default password 'hadoop'. Kindly can some one assist me with the error am facing with Ranger installation. ... View more

During maintenance of Cluster, we put Namenode into Safemode. How to identify if Namenode is in safemode. I mean is there a command which tells us if Namenode is in safemode. Or what are the characteristics that determine Namenode is under Safe mode ... View more

Checkpointing process is defined in 2 configuration parameters: dfs.namenode.checkpoint.period -> 10 hr which will set the time for every checkpoint. Aslos dfs.namenode.checkpoint.txns is by default set to 1 million. What does this configuration do, in apache wiki website it says this configurations sets the number of uncheckpointed transactions. In the first configuration we are setting it for every 10hrs, in such scenario what is the necessity for setting value for uncheckpointed transactions. ... View more

Was trying to run 'hdfs dfsadmin -safemode enter'. It was throwing message saying 'could not find or load main class dfsadmin'. Can someone help me understanding under which circumstances would we get this error and what is the work around to make it work. Thank you in advance ... View more