Andrew Purtell created HBASE-12128:
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Summary: Cache configuration and RpcController selection for Table
in Connection
Key: HBASE-12128
URL: https://issues.apache.org/jira/browse/HBASE-12128
Project: HBase
Issue Type: Sub-task
Reporter: Andrew Purtell
Creating Table instances should be lightweight. Apps that manage their own
Connections are expected to create Tables on demand for each interaction.
However we look up values from Hadoop Configuration when constructing Table
objects for storing to some of its fields. Configuration is a heavyweight
registry that does a lot of string operations and regex matching. Method calls
into Configuration account for 48.25% of CPU time when creating the HTable
object in 0.98. Another ~48% of CPU is spent constructing the desired
RpcController object via reflection in 0.98. Together this can account for ~20%
of total on-CPU time of the client. See parent issue for more detail.
We are using Connection like a factory for Table. We should cache configuration
for Table in Connection. We should also create by reflection once and cache the
desired RpcController object, and clone it for new Tables.
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