Jan Van Besien created HBASE-14205: -------------------------------------- Summary: RegionCoprocessorHost System.nanoTime() performance bottleneck Key: HBASE-14205 URL: https://issues.apache.org/jira/browse/HBASE-14205 Project: HBase Issue Type: Bug Reporter: Jan Van Besien
The tracking of execution time of coprocessor methods introduced in HBASE-11516 introduces 2 calls to System.nanoTime() per coprocessor method per coprocessor. This is resulting in a serious performance bottleneck in certain scenarios. For example consider the scenario where many rows are being ingested (PUT) in a table which has multiple coprocessors (we have up to 20 coprocessors). This results in 8 extra calls to System.nanoTime() per row (prePut, postPut, postStartRegionOperation and postCloseRegionOperation) which has been seen to result in a 50% increase of execution time. I think it is generally considered bad practice to measure execution times on such a small scale (per single operation). Also note that measurements are taken even for coprocessors that do not even have an actual implementation for certain operations, making the problem worse. -- This message was sent by Atlassian JIRA (v6.3.4#6332)