https://community.cloudera.com/t5/Support-Questions/What-does-nclients-option-of-performance-evaluation-tool-pe/m-p/234115#M195935 <P>Hi <A rel="user" href="https://community.cloudera.com/users/22154/aishwaryamdixit.html" nodeid="22154">@Aishwarya Dixit</A>, pe or "Performance Evaluation" is a tool based on MapReduce to test read/writes to HBase. nclients means that 10*nclients mappers will be started to run the supplied pe command. Example:</P><PRE>hbase pe randomWrite 2 ... 2017-09-02 01:31:17,681 INFO [main] mapreduce.JobSubmitter: number of splits:20</PRE><P>starts a MR job with 20 mappers and 1 reducer. So you can start with a small number like 1-3 to make sure HBase works as expected, and then increase it to about max number of mappers you can run on your cluster divided by 10. Of course you can use a larger number, but then mappers will run in multiple "waves".</P> Sat, 02 Sep 2017 08:49:17 GMT pminovic 2017-09-02T08:49:17Z https://community.cloudera.com/t5/Support-Questions/What-does-nclients-option-of-performance-evaluation-tool-pe/m-p/234113#M195933 <P>Hbase provides pe tool for performance benchmarking. It has an option to mention the number of clients. Is it the number of Hbase region servers we have in the cluster?</P> Fri, 01 Sep 2017 16:01:52 GMT https://community.cloudera.com/t5/Support-Questions/What-does-nclients-option-of-performance-evaluation-tool-pe/m-p/234113#M195933 aishwaryamdixit 2017-09-01T16:01:52Z https://community.cloudera.com/t5/Support-Questions/What-does-nclients-option-of-performance-evaluation-tool-pe/m-p/234114#M195934 <P><A rel="user" href="https://community.cloudera.com/users/3418/jsensharma.html" nodeid="3418">@Jay SenSharma</A><BR />Hi, Can you please help me in this regard?</P> Fri, 01 Sep 2017 16:04:19 GMT https://community.cloudera.com/t5/Support-Questions/What-does-nclients-option-of-performance-evaluation-tool-pe/m-p/234114#M195934 aishwaryamdixit 2017-09-01T16:04:19Z https://community.cloudera.com/t5/Support-Questions/What-does-nclients-option-of-performance-evaluation-tool-pe/m-p/234115#M195935 <P>Hi <A rel="user" href="https://community.cloudera.com/users/22154/aishwaryamdixit.html" nodeid="22154">@Aishwarya Dixit</A>, pe or "Performance Evaluation" is a tool based on MapReduce to test read/writes to HBase. nclients means that 10*nclients mappers will be started to run the supplied pe command. Example:</P><PRE>hbase pe randomWrite 2 ... 2017-09-02 01:31:17,681 INFO [main] mapreduce.JobSubmitter: number of splits:20</PRE><P>starts a MR job with 20 mappers and 1 reducer. So you can start with a small number like 1-3 to make sure HBase works as expected, and then increase it to about max number of mappers you can run on your cluster divided by 10. Of course you can use a larger number, but then mappers will run in multiple "waves".</P> Sat, 02 Sep 2017 08:49:17 GMT https://community.cloudera.com/t5/Support-Questions/What-does-nclients-option-of-performance-evaluation-tool-pe/m-p/234115#M195935 pminovic 2017-09-02T08:49:17Z