tsdb

Bug Description
taosBenchmark subscribe crash

To Reproduce
Steps to reproduce the behavior:

1. Build taosd, taosBenchmark in latest develop branch
2. go to 'TDengine/src/kit/taos-tools/example'
3. execute taosBenchmark -f insert_csv.json
4. execute taosBenchmark -f subscribe.json

Expected Behavior
taosBenchmark -f subscribe.json should not crash

Screenshots
N/A

Describe the Bug

The JSON response sent back over HTTP doesn't encode certain characters correctly.

For example, if a value in a string column contains the char \1 the byte value is copied verbatim in the response, breaking the client:

>>> json.loads('"\1"')
...
json.decoder.JSONDecodeError: Invalid control character at: line 1 column 2 (char 1)

Instead, we shou

示例

• 企业或者组织: 夜莺
• 地点：北京
• 联系方式：contact-us at xxx.com
• 使用场景和经验分享：你们最看重夜莺的哪些功能，解决一个什么样的问题，以及使用规模和范围，使用夜莺监控构建企业级监控体系的过程中，有哪些好的经验分享。
• 需求建议：希望哪些点上夜莺监控能做的更好，更契合您的使用场景。

We should make the distributor ring auto forget the distributor instances which have been unhealthy for a defined amount of time because when a distributor gets hard killed then it has no chance to unregister itself from the ring. Over time this can lead to a situation where the ring is full of old unhealthy instances, growing the size of the ring and putting load on the memberlist client.

Sinc