Hadoop namenode disk size -


are there suggestions size of hdd on namenode physical machine? sure, not store data hdfs datanode should depend on while creating cluster?

physical disk space on namenode not matter unless run datanode on same node. however, important have memory (ram) space allocated namenode. because namenode stores metadata of hdfs (block allocations, block locations etc.), in memory. if sufficient memory not allocated, namenode might run out of memory , fail.


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