zhoutai.zt created HADOOP-15020: ----------------------------------- Summary: NNBench not support run more than one map task on one host Key: HADOOP-15020 URL: https://issues.apache.org/jira/browse/HADOOP-15020 Project: Hadoop Common Issue Type: Improvement Components: benchmarks Affects Versions: 2.7.2 Environment: Hadoop 2.7.2 Reporter: zhoutai.zt Priority: Minor
When benchmark NameNode performance with NNBench. I start with pseudo distributed deploy. Everything goes well with "-maps 1". BUT with -maps N (n>1) and -operation create_write, many exceptions meet during the benchmark. Hostname is part of the file path, which can differentiate hosts. With more than two map tasks run on the same host, more than two map tasks may operate on the same file, leading to exceptions. 17/11/07 15:22:32 INFO hdfs.NNBench: RAW DATA: AL Total #1: 84 17/11/07 15:22:32 INFO hdfs.NNBench: RAW DATA: AL Total #2: 43 17/11/07 15:22:32 INFO hdfs.NNBench: RAW DATA: TPS Total (ms): 2570 17/11/07 15:22:32 INFO hdfs.NNBench: RAW DATA: Longest Map Time (ms): 814.0 17/11/07 15:22:32 INFO hdfs.NNBench: RAW DATA: Late maps: 0 17/11/07 15:22:32 INFO hdfs.NNBench: {color:red}RAW DATA: # of exceptions: 3000{color} 2017-11-07 14:54:08,082 INFO org.apache.hadoop.hdfs.NNBench: Exception recorded in op: Create/Write/Close 2017-11-07 14:54:08,082 INFO org.apache.hadoop.hdfs.NNBench: Exception recorded in op: Create/Write/Close 2017-11-07 14:54:08,083 INFO org.apache.hadoop.hdfs.NNBench: Exception recorded in op: Create/Write/Close -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: common-dev-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-dev-h...@hadoop.apache.org