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2fd99c6f4b
This functionality enables users to block or allow creation of new
chunks on a data node for one or more hypertables. Use cases for this
include the ability to block new chunks when a data node is running
low on disk space or to affect chunk distribution across data nodes.
Sometimes blocking data nodes for new chunks can make a hypertable
under-replicated. For that case an additional argument `force => true`
can be supplied to force blocking new chunks.
Here are some examples.
Block for a specific hypertable:
`SELECT * FROM block_new_chunks_on_server('server_1', 'disttable');`
Block for all hypertables on the server:
`SELECT * FROM block_new_chunks_on_server('server_1', force =>true);`
Unblock:
`SELECT * FROM allow_new_chunks_on_server('server_1', true);`
This change adds the `force` argument to `detach_server` as well. If
detaching or blocking new chunks will make a hypertable
under-replicated then `force => true` needs to used.