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HDFS Configuration (AMI 1.0)
The following table describes the default Hadoop Distributed File System (HDFS) parameters and their settings.
| Parameter | Definition | Default Value |
|---|---|---|
| dfs.block.size | The size of HDFS blocks. When operating on data stored in HDFS, the split size is generally
the size of an HDFS block. Larger numbers provide less task granularity, but also put less
strain on the cluster NameNode. | 134217728 (128 MB) |
| dfs.replication | This determines how many copies of each block to store for durability. For small clusters we set this to 2 because the cluster is small and easy to restart in case of data loss. You can change the setting to 1, 2, or 3 as your needs dictate. |
1 for clusters < four nodes 2 for clusters < ten nodes 3 for all other clusters |
