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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2129) Simplify BlockReader to not inherit from FSInputChecker
Date Wed, 02 Nov 2011 21:23:33 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13142554#comment-13142554
] 

Todd Lipcon commented on HDFS-2129:
-----------------------------------

Just for the sake of amusement, results from Apache 0.20.2:
|Threads|0.20.2| Total speedup in trunk after patches |
| 4 | 106197 KB/sec | 2.69x |
| 16 | 246712 KB/sec | 2.13x |
| 8 | 186860 KB/sec | 2.93x |

Should make HBase folks happy! :)

                
> Simplify BlockReader to not inherit from FSInputChecker
> -------------------------------------------------------
>
>                 Key: HDFS-2129
>                 URL: https://issues.apache.org/jira/browse/HDFS-2129
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs client, performance
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.24.0
>
>         Attachments: hdfs-2129-benchmark.png, hdfs-2129.txt, hdfs-2129.txt, hdfs-2129.txt,
hdfs-2129.txt, hdfs-2129.txt, hdfs-2129.txt, hdfs-2129.txt, seq-read-1gb-bench.png
>
>
> BlockReader is currently quite complicated since it has to conform to the FSInputChecker
inheritance structure. It would be much simpler to implement it standalone. Benchmarking indicates
it's slightly faster, as well.

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