dmsolr opened a new pull request #4239: [WIP] Provide influxdb as a new storage 
plugin
URL: https://github.com/apache/skywalking/pull/4239
 
 
   Please answer these questions before submitting pull request
   
   - Why submit this pull request?
   - [ ] Bug fix
   - [X] New feature provided
   - [ ] Improve performance
   ___
   ### New feature or improvement
   - Describe the details and related test reports.
   
   This PR provides a new storage plugin for OAP which uses two-level storage. 
   
   The first level is a relationship database stored something likes 
`inventory`, which has transactions and updates. Stored in MySQL.(Now, I make 
H2 as relationship database. Because it is easy for test.)
   
   The second level is a time-series database, stored `metrics`, `logs`, and 
`traces`. Those data have strong time-lined and no-transaction, no-updated, 
no-deleted. Stored in InfluxDB.
   
   InfluxDB is a very powerful time-series database. It is good at manipulating 
time-series data. So, it is suitable for our trace records that have strong 
time-lined, no-updated, and no-deleted.
   
   Now, it is an experimental feature. We need to continuously improve it with 
you. And it is a meaningful experience for others NoSQL/TSDB likes Apache 
Druid, OpenTSDB.
   
   ------------------------------------
   ## TODO list
   - [x] feature
   - [ ] e2e
   - [ ] document 
   - [ ] change MySQL as the level storage

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