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f13214891c
Add a new function, `alter_data_node()`, which can be used to change the data node's configuration originally set up via `add_data_node()` on the access node. The new functions introduces a new option "available" that allows configuring the availability of the data node. Setting `available=>false` means that the node should no longer be used for reads and writes. Only read "failover" is implemented as part of this change, however. To fail over reads, the alter data node function finds all the chunks for which the unavailable data node is the "primary" query target and "fails over" to a chunk replica on another data node instead. If some chunks do not have a replica to fail over to, a warning will be raised. When a data node is available again, the function can be used to switch back to using the data node for queries. Closes #2104