It is useful to understand what would be the size of data and free space if you want to write something to HDFS. Default block size in HDFS is 64MB, so one file will take at least 64MB. Also, default replication ratio is 3x. The size will be:
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$HADOOP_HOME/bin/hadoop fsck /
Check the free space (plain free space, not taking into account replication or block size):$HADOOP_HOME/bin/hadoop dfsadmin -report
How big is the folder (it is actually replication ratio times bigger):$HADOOP_HOME/bin/hadoop dfs -dus [/some/folder]
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