The table below describes the general settings that influence Radoop's operation. They are found in the Altair AI Studio > Settings > Preferences pull-down menu dialog, under the Radoop tab. All other settings that control the execution are located in the Connection settings. See the Configuring Radoop Connections page for a complete list.
Note that each internal key starts with the prefix rapidminer.radoop.
Miscellaneous
Property
Internal key
Default value
Description
Auto describe
auto_describe
disabled
Toggles whether to automatically describe all Hive objects after connection or refresh. If enabled, this property saves the state of the toggle button on the Hadoop Data view. All metadata of your Hive objects are immediately fetched, which can be slow if there are many objects.
Describe max errors
describe.max_errors
5
Sets the threshold for errors. The Hadoop Data view considers a connection failed if it encounters, during describing Hive objects, more errors than this limit. You may have to increase this value if, for example, you have many Hive objects erroring when described (e.g., missing custom input/output format classes).
Sample size
Property
Internal key
Default value
Description
Sample size overall
sample_size.overall
200000
Sets the sample size for Hadoop data sets on nest output. When data arrives onto the output of the Radoop Nest, it is fetched into the client machine's memory. Use this value to limit the size of the data (sample). A value of 0 means full sample.
Sample size breakpoint
sample_size.breakpoint
1000
Sets the sample size for a Hadoop data set after a breakpoint in a process, and in the Hadoop Data view. When you pause a Radoop process using a breakpoint, a sample of the processed data is fetched into the client machine's memory to be manually examined. Use this value to define the number of rows in the sample. The Hadoop Data View also uses this limit when exploring tables. A value of 0 means full sample.
Logging
Property
Internal key
Default value
Description
Enable log4j logging
log4j
disabled
Determines if log4j logs should be collected into the user folder.
Log4j properties file
log4j.properties
If log4j log collection is enabled and you wish to use your own log4j.properties file, define its location here. The file must contain the 'log4j.rootLogger' property which defines the logging level and the appenders to attach.
JDBC Connection Pool
Property
Internal key
Default value
Description
Connection pool size
connection_pool.fast_statement.size
8
Size of the Hive JDBC connection pool. Increase it if you want to run many operations in parallel (e.g. on Altair AI Hub).
Connection pool timeout
connection_pool.fast_statement.timeout
85
Timeout for waiting for available connection (seconds).
Logging
Property
Internal key
Default value
Description
Enable log4j logging
radoop.log4j
disabled
Determines if log4j logs should be collected into the user folder.
Log4j properties file
radoop.log4j.properties
empty
If log4j log collection is turned on and you wish to use your own log4j.properties file, define its location here. The file must contain the 'log4j.rootLogger' property which defines the logging level and the appenders to attach.
