def __init__(self, tree, nodePath, fsPath):
    self.tree = tree
    self.nodePath = nodePath
    self.fsPath = fsPath
    self.metadataFile = join(fsPath, '.ceres-node')
    self.timeStep = None
    self.aggregationMethod = 'average'
    self.sliceCache = None
    self.sliceCachingBehavior = DEFAULT_SLICE_CACHING_BEHAVIOR