Updates from the Space the tuples that match the specified filter on a "best effort" basis. If no filter is specified, all tuples are updated. This operation does not block other space operations while it is ongoing. Thus, it is up to the application to synchronize its clients to guarantee that no write operations happen while the clear is ongoing. Internally, this operation, among other tasks, executes a series of small queries with the provided filter. Depending on the filter string and the indexing of the space, there is the possibility that one of these queries results in a linear scan that takes a significant amount of time. If that were to happen, one or more of the space seeders will log a message warning that a long query was executed some seconds after the user executes this call. To fix this problem, the user should update the filter string or add extra secondary indices in order to avoid long linear scans.

Updates a Tuple in the Space. Only the fields in the tuple argument are modified.

Updates a Tuple in the Space. Only the fields in the tuple argument are modified. Allows you to specify a lock wait value, lock or unlock value and a forget value.