@Harshali Patel NameNode service stores its metadata on the configured "dfs.namenode.name.dir" tag available on hdfs-site.xml. This folder is used for storing the metadata in the form of FSI IMAGE and also used for checkpointing. For more details go through the above link posted by Jay. ... View more

My stacks are : HCP 1.4.2.0 with Metron 0.4.1.4.2.0 i.e actually Metron 0.4.1 HDP 2.6.5.0-292 KAFKA 1.0.0 STROM 1.1.0 Should i have to downgrade the Kafka, if yes, Please suggest the way. ... View more

@Sindhu Its on Metron alert ui log, but there is no error on Metron management and rest log. I just changed the port to 6k series now that error is resolve, but now the problem is different. Now the Metron service on my cluster is running with green, but Strom which Metron internally uses not able to read the Kafka topic, and there are no errors on any of the logs. And can please suggest the version Metron that i can use with HDP 2.6.5.0 includes KAFKA 1.0.0 and Strom 1.1.0. ... View more

@brahmasree b Connect to zookeeper and delete the znode dir related to storm service and restart both "zookeeper" and "storm" service. /usr/hdp/current/zookeeper-server/bin/zkCli.sh -server <hostname>:2181 [zk: <hostname>:2181(CONNECTED) 0]ls / [zk: <hostname>:2181(CONNECTED) 0]rmr /storm ... View more

@Matthias Tewordt Below link will help you, https://stackoverflow.com/questions/2983248/com-mysql-jdbc-exceptions-jdbc4-communicationsexception-communications-link-fai ... View more

@Kumar Deepak "spark" user is a service user, hence it has no password. you should switch user either from root or sudo user. ... View more

HDF 3.1.X stack works with Ambari 2.6.1 and higher. Please read the support metric of the HDF stack your are using. ... View more

@Vinay K Which version of Ambari you are using? And are you using mpack? ... View more