Configuration

Query tuning

It is possible to tune Table.select() behaviour using QueryConfig:

from vastdb.config import QueryConfig
cfg = QueryConfig()  # default configuration values
# <modify configuration>
table.select(columns=['c1'], predicate=(_.c2 > 2), config=cfg)

Multiple endpoints

In order to split the scanning work of a query across multiple CNode connections, it is possible to explicitly list the CNodes URLs (both via VIPs and/or domain names):

cfg.data_endpoints=[
    "http://172.19.196.1",
    "http://172.19.196.2",
    "http://172.19.196.3",
    "http://172.19.196.4",
]

Internal CNode concurrency

When an RPC is being handled by a CNode, it spawns num_sub_splits worker threads that allow us to process a single request from multiple CNode cores. Using higher internal CNode concurrency can help selective queries:

cfg.num_sub_splits = 8