Nov 26, 2014 · 20 hadoop namenode -format this command deletes all files in your hdfs. tmp directory contains two folders datanode, namenode in local filesystem. if you format the namenode these two …

Sep 18, 2013 · Hadoop NameNode is the centralized place of an HDFS file system which keeps the directory tree of all files in the file system, and tracks where across the cluster the file data is kept. In …

Aug 6, 2018 · $ bin/hdfs namenode -format is NOT the command that you actually submitted ! From the output you gave: 18/08/05 19:20:02 INFO namenode.NameNode: createNameNode [–format] Notice …

Jul 14, 2014 · Namenode format and starting the namenode in hadoop2.2.0 Ask Question Asked 11 years, 4 months ago Modified 2 months ago

In Hadoop filesystem you have all of traditional storage formats available to you (like you can store PNG and JPG images on HDFS if you like), but you also have some Hadoop-focused file formats to use …

Jun 1, 2016 · To convert date string from one format to another you have to use two date function of hive unix_timestamp(string date, string pattern) convert time string with given pattern to unix time …

Check this log file: hadoop-hduser-namenode-ratan-Inspiron-N5110.log If it says namenode is not formatted, format it bin/hadoop namenode -format

Sep 10, 2009 · 1 You need to call bin/stop-all.sh to stop dfs and mapreduce. Delete data dir which is configured in conf/hdfs-site.xml and conf/mapred-site.xml. Make sure that you have deleted some …

Nov 10, 2011 · 37 hadoop.tmp.dir in the core-site.xml is defaulted to /tmp/hadoop-${user.name} which is cleaned after every reboot. Change this to some other directory which doesn't get cleaned on reboot.

Apr 24, 2016 · Avro is a row-based storage format for Hadoop. Parquet is a column-based storage format for Hadoop. If your use case typically scans or retrieves all of the fields in a row in each query, …