How to solve the problems encountered in the process of hadoop installation and construction
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When starting hadoop, datanode is missing after the slave node jps:
Reason: check the datanode log of ordinary users and find that datanode clusterID is inconsistent with namenode clusterID (you can view namenode clusterID in / home/zoe/hadoopdata/dfs/name/current/VERSION), which may be caused by formatting after configuring the hadoop environment many times.
Solution: clear the "~ / hadoopdata" of master and reformat
Otherwise, enter the core-site.xml of the hadoop configuration file and edit as follows:
Dfs.replication
one
Dfs.datanode.data.dir
/ home/zoe/hadoop/hadoopdata/dfs/name/
Dfs.datanode.data.dir
/ home/zoe/hadoop/hadoopdata/dfs/data/
Changed to: namenode clusterID
two。 "no roote to host" when calculating the pi value:
Solution: turn off the firewall: service iptables stop
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