Jeongseok Kang

add: UNSIGNED numeric data types for MySQL

3

Hi. I found that type suggestion does not provide any `unsigned` types, which gave me a little inconvenience. I found the list of types that support `unsigned` option at https://dev.mysql.com/doc/refman/8.0/en/numeric-type-syntax.html.

fix: quotation marks to be unicode.

1

- This makes errors while building AirSim.

feat: Automate force-termination of hanging sessions

3

This PR resolves #603. To automate force-termination of hanging sessions, it will be processed in the order below: 1. Query kernels - where `status` is `PREPARING` or `TERMINATING` - and...

Define a structured JSON schema for transporting kernel status data to backend.ai-webui

3

**Is your feature request related to a problem? Please describe.** We need to define a structured JSON schema for transporting kernel status data to [backend.ai-webui](https://github.com/lablup/backend.ai-webui). Although we already support responding...

Let's group string-literal `KernelEvent.reason` values into a manageable format

4

**Is your feature request related to a problem? Please describe.** Each **Kernel-Lifecycle-EventArgs** class has a `reason` field to briefly describe the source of the lifecycle event. For example, when terminating...

In this PR, watchdog-related properties are added to `AbstractDistributedLock`. - `enqueue_watchdog_task()` and `dequeue_watchdog_task()` are for abstraction; these methods provide encapsulation of actual task handling process. - `_watchdog_timer()` is an abstract...

feat: Implement `Raft` consensus algorithm for distributed managers

1

This PR is related to lablup/backend.ai#415.

This PR resolves lablup/backend.ai#415. WIP: Implementing [Raft](https://github.com/lablup/raft-py) algorithm based leader election for manager workers.

docs: Update redis to follow the latest spec

1

## What do these changes do? I changed some Redis code from the documentation to follow the latest API. It is based on redis-py>=4.2.x on which aioredis has been merged...

feat: Leader election based GlobalTimer

2

This PR resolves(partially) lablup/backend.ai#415. Using [aioraft-ng](https://github.com/lablup/aioraft-ng), this PR removes a dependency on`DistributedLock` from `GlobalTimer` and ensures that `GlobalTimer` ticks only run on the leader process.