Li Lu updated YARN-3595:
    Summary: Performance optimization using connection cache of Phoenix 
timeline writer  (was: Performance optimization for the connection cache of 
Phoenix timeline writer)

> Performance optimization using connection cache of Phoenix timeline writer
> --------------------------------------------------------------------------
>                 Key: YARN-3595
>                 URL: https://issues.apache.org/jira/browse/YARN-3595
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Li Lu
>            Assignee: Li Lu
> The story about the connection cache in Phoenix timeline storage is a little 
> bit long. In YARN-3033 we planned to have shared writer layer for all 
> collectors in the same collector manager. In this way we can better reuse the 
> same heavy-weight storage layer connection, therefore it's more friendly to 
> conventional storage layer connections which are typically heavy-weight. 
> Phoenix, on the other hand, implements its own connection interface layer to 
> be light-weight, thread-unsafe. To make these connections work with our 
> "multiple collector, single writer" model, we're adding a thread indexed 
> connection cache. However, many performance critical factors are yet to be 
> tested. 
> In this JIRA we're tracing performance optimization efforts for this 
> connection cache. At the very beginning stage we may need to understand:
> # If the current, thread-based indexing is an appropriate approach, or we can 
> use some better ways to index the connections. 
> # the best size of the cache, presumably as the proposed default value of a 
> configuration. 
> # how long we need to preserve a connection in the cache. 
> Please feel free to add this list. 

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