hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-516) Low Latency distributed reads
Date Mon, 14 Sep 2009 15:50:57 GMT

    [ https://issues.apache.org/jira/browse/HDFS-516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12755033#action_12755033
] 

Raghu Angadi commented on HDFS-516:
-----------------------------------

Hi Jay,

will go through the patch. I hope a few others get a chance to look at it as well.

Since it is contrib, it certainly makes it easier to include in trunk. I am not sure about
0.21 timeline. 

> Low Latency distributed reads
> -----------------------------
>
>                 Key: HDFS-516
>                 URL: https://issues.apache.org/jira/browse/HDFS-516
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Jay Booth
>            Priority: Minor
>         Attachments: hdfs-516-20090912.patch
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> I created a method for low latency random reads using NIO on the server side and simulated
OS paging with LRU caching and lookahead on the client side.  Some applications could include
lucene searching (term->doc and doc->offset mappings are likely to be in local cache,
thus much faster than nutch's current FsDirectory impl and binary search through record files
(bytes at 1/2, 1/4, 1/8 marks are likely to be cached)

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message