[IPC] Improvement of lock mechanism in Listener and Reader thread -----------------------------------------------------------------
Key: HADOOP-7105 URL: https://issues.apache.org/jira/browse/HADOOP-7105 Project: Hadoop Common Issue Type: Improvement Components: ipc Affects Versions: 0.21.0 Reporter: jinglong.liujl Attachments: improveListenerLock.patch In many client cocurrent access, single thread Listener will become bottleneck. Many client can't be served, and get connection time out. To improve Listener capacity, we make 2 modification. 1. Tuning ipc.server.listen.queue.size to a larger value to avoid client retry. 2. In currently implement, Listener will call registerChannel(), and finishAdd() in Reader, which will request Reader synchronized lock. Listener will cost too many time in waiting for this lock. We have made test, ./bin/hadoop org.apache.hadoop.hdfs.NNThroughputBenchmark -op create -threads 10000 -files 10000 case 1 : Currently can not pass. and report hadoop-rd101.jx.baidu.com/10.65.25.166:59310. Already tried 0 time(s). case 2 : tuning back log to 10240 average cost : 1285.72 ms case 3 : tuning back log to 10240 , and improve lock mechanism in patch average cost : 941.32 ms performance in average cost will improve 26% -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.