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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-12128) Cache configuration and RpcController selection for Table in Connection
Date Tue, 30 Sep 2014 23:00:41 GMT
Andrew Purtell created HBASE-12128:
--------------------------------------

             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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