[ https://issues.apache.org/jira/browse/HBASE-3899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
David S. Wang resolved HBASE-3899. ---------------------------------- Resolution: Fixed Fix Version/s: (was: 0.90.7) > enhance HBase RPC to support free-ing up server handler threads even if > response is not ready > --------------------------------------------------------------------------------------------- > > Key: HBASE-3899 > URL: https://issues.apache.org/jira/browse/HBASE-3899 > Project: HBase > Issue Type: Improvement > Components: ipc > Affects Versions: 0.90.6 > Reporter: dhruba borthakur > Assignee: dhruba borthakur > Fix For: 0.92.0 > > Attachments: HBASE-3899-2.patch, HBASE-3899-amend-v4.patch, > HBASE-3899.patch, asyncRpc.txt, asyncRpc.txt > > > In the current implementation, the server handler thread picks up an item > from the incoming callqueue, processes it and then wraps the response as a > Writable and sends it back to the IPC server module. This wastes > thread-resources when the thread is blocked for disk IO (transaction logging, > read into block cache, etc). > It would be nice if we can make the RPC Server Handler threads pick up a call > from the IPC queue, hand it over to the application (e.g. HRegion), the > application can queue it to be processed asynchronously and send a response > back to the IPC server module saying that the response is not ready. The RPC > Server Handler thread is now ready to pick up another request from the > incoming callqueue. When the queued call is processed by the application, it > indicates to the IPC module that the response is now ready to be sent back to > the client. > The RPC client continues to experience the same behaviour as before. A RPC > client is synchronous and blocks till the response arrives. > This RPC enhancement allows us to do very powerful things with the > RegionServer. In future, we can make enhance the RegionServer's threading > model to a message-passing model for better performance. We will not be > limited by the number of threads in the RegionServer. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira