VectorH Configuration Considerations
The list of cluster nodes is written to a configuration file, which is generated during installation: $II_SYSTEM/ingres/files/hdfs/slaves.
There is a separate vectorwise.conf per node. Some configuration parameters, however, are relevant for the master node only and some are relevant for all nodes.
• Query execution memory size (max_memory_size) and bufferpool size (bufferpool_size) are set per node.
• num_cores is relevant on the master node only but is set to the number of cores per node. An equal number of cores on each node is assumed.
• max_parallelism_level is relevant on the master node only but is set to the total level of parallelism throughout the cluster. A good value is the total number of physical cores.
Most options are set correctly automatically.
Note: VectorH assumes a homogeneous cluster, that is, all nodes participating in VectorH query execution have the same amount of memory, cores, and execution speed.