Advanced ORC properties
Usually, you do not need to modify Optimized Row Columnar (ORC) properties, but occasionally, Cloudera Support advises making such changes. Review the property keys, default values, and descriptions you can configure ORC to suit your needs.
Property keys and defaults
You use the Safety Valve feature in Cloudera Manager to change ORC properties.
| Key | Default Setting | Description |
|---|---|---|
| orc.compress | ZLIB | Compression type (NONE, ZLIB, SNAPPY). |
| orc.compress.size | 262,144 | Number of bytes in each compression block. |
| orc.stripe.size | 268,435,456 | Number of bytes in each stripe. |
| orc.row.index.stride | 10,000 | Number of rows between index entries (>= 1,000). |
| orc.create.index | true | Sets whether to create row indexes. |
| orc.bloom.filter.columns | -- | Comma-separated list of column names for which a Bloom filter must be created. |
| orc.bloom.filter.fpp | 0.05 | False positive probability for a Bloom filter. Must be greater than 0.0 and less than 1.0. |
