Li Lu created YARN-3595:

             Summary: Performance optimization for the connection cache of 
Phoenix timeline writer
                 Key: YARN-3595
             Project: Hadoop YARN
          Issue Type: Sub-task
            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 
# how long we need to preserve a connection in the cache. 

Please feel free to add this list. 

This message was sent by Atlassian JIRA

Reply via email to