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Date: Wed, 14 Nov 2007 15:36:43 -0800 (PST)
From: "Doug Cutting (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Updated: (HADOOP-2172) PositionCache was removed from
 FSDataInputStream, causes extremely bad MapFile performance
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     [ https://issues.apache.org/jira/browse/HADOOP-2172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Doug Cutting updated HADOOP-2172:
---------------------------------

    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

I just committed this.

> PositionCache was removed from FSDataInputStream, causes extremely bad MapFile performance
> ------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-2172
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2172
>             Project: Hadoop
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.14.3, 0.15.0
>            Reporter: Johan Oskarsson
>            Assignee: Doug Cutting
>            Priority: Blocker
>             Fix For: 0.15.1
>
>         Attachments: HADOOP-2172-2.patch, HADOOP-2172-2.patch, HADOOP-2172-3.patch, HADOOP-2172-4.patch, positioncache-v1.patch
>
>
> The PositionCache in FSDataInputStream seems to have been removed in HADOOP-1470. This causes for example MapFile.get usage to be  extremely slow as the file position isn't cached in memory.

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