Is it possible to keep old hypertable chunks on old nodes while writing new chunks to only newer nodes?

[loveworldlovesky]

Hi,
dmitry from Timescale Team Tell me how to control
the data to be saved to the new node .
Please refer to

Distributed hypertables in multinode-timescaledb,How to control which node to save to

Hey @loveworldlovesky , We have two experimental functions which allow to do this: block_new_chunks and allow_new_chunks. First function prevents creating new chunks on a particular data node, but updates for existing chunks are still going. I believe those functions are not documented unfortunately, so I’ll share the link to the definition: https://github.com/timescale/timescaledb/blob/main/sql/ddl_experimental.sql#L15

There are two experimental functions that can solve.
( block_new_chunks and allow_new_chunks )