def getInstancesInCluster(self, clusterName):
"""
Returns List<String>
Parameters:
clusterName: String
@Override
"""
# String
memberInstancesPath = HelixUtil.getMemberInstancesPath(clusterName)
return _zkClient.getChildren(memberInstancesPath)
def addCluster(self, clusterName, overwritePrevRecord):
"""
Returns void
Parameters:
clusterName: StringoverwritePrevRecord: boolean
@Override
"""
# String
root = "/" + clusterName
# String
path = None
if _zkClient.exists(root):
logger.warn("Root directory exists.Cleaning the root directory:" + root + " overwritePrevRecord: " + overwritePrevRecord)
if overwritePrevRecord:
_zkClient.deleteRecursive(root)
else:
raise HelixException("Cluster " + clusterName + " already exists")
_zkClient.createPersistent(root)
_zkClient.createPersistent(HelixUtil.getIdealStatePath(clusterName))
path = PropertyPathConfig.getPath(PropertyType.CONFIGS, clusterName, ConfigScopeProperty.CLUSTER.toString(), clusterName)
_zkClient.createPersistent(path, True)
_zkClient.writeData(path, ZNRecord(clusterName))
path = PropertyPathConfig.getPath(PropertyType.CONFIGS, clusterName, ConfigScopeProperty.PARTICIPANT.toString())
_zkClient.createPersistent(path)
path = PropertyPathConfig.getPath(PropertyType.CONFIGS, clusterName, ConfigScopeProperty.RESOURCE.toString())
_zkClient.createPersistent(path)
path = PropertyPathConfig.getPath(PropertyType.PROPERTYSTORE, clusterName)
_zkClient.createPersistent(path)
_zkClient.createPersistent(HelixUtil.getLiveInstancesPath(clusterName))
_zkClient.createPersistent(HelixUtil.getMemberInstancesPath(clusterName))
_zkClient.createPersistent(HelixUtil.getExternalViewPath(clusterName))
_zkClient.createPersistent(HelixUtil.getStateModelDefinitionPath(clusterName))
_zkClient.createPersistent(HelixUtil.getControllerPath(clusterName))
path = PropertyPathConfig.getPath(PropertyType.HISTORY, clusterName)
# ZNRecord
emptyHistory = ZNRecord(PropertyType.HISTORY.toString())
# List<String>
emptyList = ArrayList<String>()
emptyHistory.setListField(clusterName, emptyList)
_zkClient.createPersistent(path, emptyHistory)
path = PropertyPathConfig.getPath(PropertyType.MESSAGES_CONTROLLER, clusterName)
_zkClient.createPersistent(path)
path = PropertyPathConfig.getPath(PropertyType.STATUSUPDATES_CONTROLLER, clusterName)
_zkClient.createPersistent(path)
path = PropertyPathConfig.getPath(PropertyType.ERRORS_CONTROLLER, clusterName)
_zkClient.createPersistent(path)