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From "Ravi Prakash (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2984) S-live: Rate operation count for delete is worse than 0.20.204 by 28.8%
Date Wed, 22 Aug 2012 21:02:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13439842#comment-13439842
] 

Ravi Prakash commented on HDFS-2984:
------------------------------------

Hmm... I ran 

{noformat}
bin/hadoop org.apache.hadoop.fs.slive.SliveTest -duration 9999999 -dirSize 100 -files 10000
-maps 4 -seed 1 -readSize 20480,20480 -writeSize 20480,20480 -appendSize 20480,20480 -replication
1,1 -blockSize 10240,10240 -delete 0,uniform -create 100,uniform -mkdir 0,uniform -rename
0,uniform -append 0,uniform -ls 0,uniform -read 0,uniform {noformat}
and then 
{noformat} bin/hadoop org.apache.hadoop.fs.slive.SliveTest -duration 9999999 -dirSize 100
-files 10000 -maps 4 -seed 1 -readSize 20480,20480 -writeSize 20480,20480 -appendSize 20480,20480
-replication 1,1 -blockSize 10240,10240 -delete 100,uniform -create 0,uniform -mkdir 0,uniform
-rename 0,uniform -append 0,uniform -ls 0,uniform -read 0,uniform {noformat}

0.23 seems to be much faster. For 0.20:
Basic report for operation type DeleteOp
-------------
Measurement "failures" = 3212
Measurement "milliseconds_taken" = 11211
Measurement "op_count" = 4000
Measurement "successes" = 788
Rate for measurement "op_count" = 356.792 operations/sec
Rate for measurement "successes" = 70.288 successes/sec
-------------
Basic report for operation type SliveMapper
-------------
Measurement "milliseconds_taken" = 16554
Measurement "op_count" = 4000
Rate for measurement "op_count" = 241.633 operations/sec


whereas for 0.23:
Basic report for operation type DeleteOp
-------------
Measurement "failures" = 3221
Measurement "milliseconds_taken" = 6604
Measurement "op_count" = 4000
Measurement "successes" = 779
Rate for measurement "op_count" = 605.694 operations/sec
Rate for measurement "successes" = 117.959 successes/sec
-------------
Basic report for operation type SliveMapper
-------------
Measurement "milliseconds_taken" = 2456
Measurement "op_count" = 4000
Rate for measurement "op_count" = 1628.664 operations/sec


The command I ran has allowed a much higher %ge of successful operations.
                
> S-live: Rate operation count for delete is worse than 0.20.204 by 28.8%
> -----------------------------------------------------------------------
>
>                 Key: HDFS-2984
>                 URL: https://issues.apache.org/jira/browse/HDFS-2984
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: benchmarks
>    Affects Versions: 0.23.1
>            Reporter: Vinay Kumar Thota
>            Assignee: Ravi Prakash
>            Priority: Critical
>         Attachments: slive.tar.gz
>
>
> Rate operation count for delete is worse than 0.20.204.xx by 28.8%

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