connection is cache has already been released because of the broken link

Feature/2.0tsdb

[TD-71] fix return value in a func with void declartion.

[TD-17] fix refcount error in query message

Refactor/cluster

Feature/2.0tsdb

[TD-17] fix error while alloc vnodes

[TD-17] fix error while drop vnodes

Feature/2.0tsdb

Merge pull request #1479 from taosdata/dependabot/maven/tests/comparisonTest/opentsdb/opentsdbtest/com.fasterxml.jackson.core-jackson-databind-2.9.10.3

Bump jackson-databind from 2.9.10.1 to 2.9.10.3 in /tests/comparisonTest/opentsdb/opentsdbtest

Refact/slguan

Bumps [jackson-databind](https://github.com/FasterXML/jackson) from 2.9.10.1 to 2.9.10.3.
- [Release notes](https://github.com/FasterXML/jackson/releases)
- [Commits](https://github.com/FasterXML/jackson/commits)
Signed-off-by: Ndependabot[bot] <support@github.com>

Hotfix/queue