hadoop-common-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "zhoutai.zt (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15020) NNBench not support run more than one map task on the same host
Date Tue, 07 Nov 2017 13:33:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16241994#comment-16241994
] 

zhoutai.zt commented on HADOOP-15020:
-------------------------------------

thanks.

> NNBench not support run more than one map task on the same 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-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: common-issues-help@hadoop.apache.org


Mime
View raw message