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First draft on TSDB 2.3 and PG 11 deprecation. #71

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First draft on TSDB 2.3 and PG 11 deprecation. #71

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Expand Up @@ -15,11 +15,11 @@ we welcome you to visit our Github repo or join our [Slack community](https://sl

For our next release, we plan to add:

- Compression policies on distributed hypertables
- Partially mutable compressed chunks to support INSERTs into a compressed hypertable.
- Downgrading between Timescale DB 2.x versions.
- High Availability: Adding nodes to a multinode cluster.
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I believe that the next version is focusing on elasticity and specifically rebalancing load when adding new DNs, not high availability?

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Draft PR, so WIP. But yes.

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@NunoFilipeSantos NunoFilipeSantos May 25, 2021 •
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Acceptance Criteria

A data node can be added to the multi-node cluster
Data is written to the new data node after it is added
Old data/chunks are moved from existing nodes to the new nodes to free up space and immediately make use of the new capacity
(Optional) All the steps can be automated

Tasks

Ability to add a data node to a multi-node cluster
Ability to move chunks to the new data node to make use of it immediately. This need not mean a "balanced" cluster.
A way to find candidate chunks to move. For example, based on number of chunks on a node (move from the node with the most chunks), least disk space, and/or based on recent/old chunks.

Reference: https://github.com/timescale/product/issues/2

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While this functionality is useful for HA, and is part of the larger HA story, it is a bit misleading to label it High Availability for this release. I agree with @mfreed that we should label this "Elasticity".

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- Various bug fixes.

The current GA (Generally Available) version is 2.2.1.
The current GA (Generally Available) version is 2.3.0.

You can read more about our architecture and design for distributed hypertables
[here][distributed-hypertables].
Expand All @@ -33,7 +33,7 @@ functionality works, and, as a result, made APIs simpler and more consistent,
while also empowering users with more control and flexibility to customize
behaviors to suit your needs. Some of these API updates are **breaking changes**.
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### What's new in TimescaleDB 2.2.1:
### What's new in TimescaleDB 2.3.0:

Skip Scan optimization on single node and multinode. This feature offers significant
improvements in performance of `SELECT` queries with `DISTINCT ON`.
Expand All @@ -49,14 +49,14 @@ planning, compression, and policies.

**PostgreSQL 11 deprecation announcement**

Timescale is working hard on our next exciting features. To make that
possible, we require functionality that is unfortunately absent on
PostgreSQL 11. For this reason, we will continue supporting PostgreSQL
11 until mid-June 2021. Sooner to that time, we will announce the
specific version of TimescaleDB in which PostgreSQL 11 support will be removed.
Timescale is working hard on our next exciting features.
To make that possible, we require functionality
that is unfortunately absent on PostgreSQL 11.
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For this reason, TimescaleDB 2.3 will be the final version that supports PostgreSQL 11.
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TimescaleDB 2.4 will require PostgreSQL 12 or 13.

<highlight type="tip">
TimescaleDB 2.2.1 is currently GA, and we encourage
TimescaleDB 2.3 is currently GA, and we encourage
users to upgrade in testing environments to gain experience and provide feedback on
new and updated features.

Expand All @@ -76,6 +76,26 @@ accidentally triggering the load of a previous DB version.**

## Unreleased

## 2.3.0 (2021-05-25)
**Features**
* #3116 Add distributed hypertable compression policies
* #3162 Use COPY when executing distributed INSERTs
* #3199 Add GENERATED column support on distributed hypertables
* #3210 Add trigger support on distributed hypertables
* #3230 Support for inserts into compressed chunks

**Bugfixes**
* #3213 Propagate grants to compressed hypertables
* #3229 Use correct lock mode when updating chunk
* #3243 Fix assertion failure in decompress_chunk_plan_create
* #3250 Fix constraint triggers on hypertables
* #3251 Fix segmentation fault due to incorrect call to chunk_scan_internal
* #3252 Fix blocking triggers with transition tables

**Thanks**
* @yyjdelete for reporting a crash with decompress_chunk and identifying the bug in the code
* @fabriziomello for documenting the prerequisites when compiling against PostgreSQL 13
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## 2.2.1 (2021-05-05)

This maintenance release contains bugfixes since the 2.2.0 release. We
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