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Posted to mapreduce-issues@hadoop.apache.org by "Konstantin Shvachko (JIRA)" <ji...@apache.org> on 2017/09/01 21:56:00 UTC
[jira] [Updated] (MAPREDUCE-6931) Remove TestDFSIO "Total
Throughput" calculation
[ https://issues.apache.org/jira/browse/MAPREDUCE-6931?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Konstantin Shvachko updated MAPREDUCE-6931:
-------------------------------------------
Priority: Critical (was: Trivial)
> Remove TestDFSIO "Total Throughput" calculation
> -----------------------------------------------
>
> Key: MAPREDUCE-6931
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6931
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: benchmarks, test
> Affects Versions: 2.8.0
> Reporter: Dennis Huo
> Assignee: Dennis Huo
> Priority: Critical
> Fix For: 2.9.0, 3.0.0-beta1, 2.7.5, 2.8.3
>
> Attachments: MAPREDUCE-6931-001.patch
>
>
> The new "Total Throughput" line added in https://issues.apache.org/jira/browse/HDFS-9153 is currently calculated as {{toMB(size) / ((float)execTime)}} and claims to be in units of "MB/s", but {{execTime}} is in milliseconds; thus, the reported number is 1/1000x the actual value:
> {code:java}
> String resultLines[] = {
> "----- TestDFSIO ----- : " + testType,
> " Date & time: " + new Date(System.currentTimeMillis()),
> " Number of files: " + tasks,
> " Total MBytes processed: " + df.format(toMB(size)),
> " Throughput mb/sec: " + df.format(size * 1000.0 / (time * MEGA)),
> "Total Throughput mb/sec: " + df.format(toMB(size) / ((float)execTime)),
> " Average IO rate mb/sec: " + df.format(med),
> " IO rate std deviation: " + df.format(stdDev),
> " Test exec time sec: " + df.format((float)execTime / 1000),
> "" };
> {code}
> The different calculated fields can also use toMB and a shared milliseconds-to-seconds conversion to make it easier to keep units consistent.
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