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Date: Thu, 8 Nov 2007 11:25:50 -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:
---------------------------------

    Fix Version/s: 0.15.1

This restores the 0.13 performance for my benchmark.  +1

Hairong, can you please review this, since you removed PositionCache as a part of HADOOP-1470?  Thanks!

> 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
>    Affects Versions: 0.14.3, 0.15.0
>            Reporter: Johan Oskarsson
>            Assignee: Johan Oskarsson
>            Priority: Blocker
>             Fix For: 0.15.1
>
>         Attachments: 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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