Li Lu created YARN-3595:
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Summary: Performance optimization for the 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
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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