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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-516) Low Latency distributed reads
Date Sat, 01 Aug 2009 00:56:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12737797#action_12737797
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Tsz Wo (Nicholas), SZE commented on HDFS-516:
---------------------------------------------

> .., svn diff misses new files, ...
For new files, run "svn add /path/to/new/files"  before "svn diff".

> 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: radfs.patch, radfs.tgz
>
>   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)

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