NebulaStream provides two possibilities to configure Coordinator.

1. Providing configuration over CLI.
2. Providing configuration using YAML file.

In the following table, we provide available configuration keys, their default values, and the corresponding descriptions.

A user may create a configuration file for starting the Coordinator and pass it as input using CLI using –configPath=<path to config file>. A template Coordinator configurations file looks as follows:

# ~~~ Configurations for the NES Coordinator ~~~
 
# ~~ IPs and Ports ~~
# Set NES ip of the REST server
restIp: 127.0.0.1
 
# Set RPC IP address of NES Coordinator
coordinatorIp: 127.0.0.1
 
# Set RPC Server port of NES Coordinator
rpcPort: 4000
 
# Set port exposed for REST endpoints
restPort: 8081
 
# Set the data port of the network manager
dataPort: 3001
 
 
# ~~ Processing Configurations ~~
# Set the number of computing slots in NES Coordinator
numberOfSlots: 65535
 
# The log level (LOG_NONE, LOG_WARNING, LOG_DEBUG, LOG_INFO, LOG_TRACE)
logLevel: LOG_DEBUG
 
# Number buffers in global buffer pool
numberOfBuffersInGlobalBufferManager: 1024
 
# Number buffers in task local buffer pool
numberOfBuffersPerWorker: 128
 
# Number buffers in source local buffer pool
numberOfBuffersInSourceLocalBufferPool: 64
 
# Size of buffer to pass data through the system
bufferSizeInBytes: 4096
 
# Number of threads available for the worker node. Defines how many queries can run in parallel.
numWorkerThreads: 1
 
# The number of queries to be processed together
queryBatchSize: 1
 
# Enable monitoring
enableMonitoring: false

optimizer:
  # The rule to be used for performing query merging
  queryMergerRule: DefaultQueryMergerRule
 
  # Advance Semantic Query Validation Feature
  advanceSemanticValidation: false
 
  # Selects the memory layout selection policy can be [FORCE_ROW_LAYOUT|FORCE_COLUMN_LAYOUT]
  memoryLayoutPolicy: FORCE_ROW_LAYOUT
 
  # Enable reconfiguration of running query plans. Default: false
  enableQueryReconfiguration: false
 
  # The number of queries to be processed together
  queryBatchSize: 1
 
  # Perform only source operator duplication when applying Logical Source Expansion Rewrite Rule.
  performOnlySourceOperatorExpansion: false